Abstract:Based on the smoothed particle hydrodynamics (SPH) method modified by corrective smoothed particle method (CSPM) and Riemann solutions，a numerical flume model is built to simulate the interaction between waves and perforated caisson，and the accuracy is also verified by comparing theoretical solutions with numerical results.The influences of the reflection coefficient Kr of perforated caisson with double-layered and the wave pressure p of static water level are studied from the factors of relative width B/L，relative wave height H/L and relative water depth d/L.The complicated process of water particles entering and leaving the wave dissipation chambers is also studied.The results show that there is a nonlinear relationship between the relative width B/L and the wave pressure p under the research conditions，and the reflection coefficient Kr decreases with the increase of the relative width B/L.Relative wave height H/L has little effect on wave pressure p and reflection coefficient Kr.With the increase of the relative water depth d/L，the wave pressure p gradually decreases，and the reflection coefficient Kr shows a nonlinear characteristic of decreasing first and then increasing.The motion of water particles in the front chamber is more intense than that in the back chamber，the horizontal velocity changes more than the vertical velocity，and the water particle velocity changes obviously near the perforated position.

Abstract:At the opening ceremony of the 17 th ASEAN-China Expo and ASEAN-China Business and Investment Summit，the General Secretary Xi put forward the instructions of “promoting the landing processing of imported goods in the cross-border trade”.In accordance with the requirements of the Notice of The State Council on Issues related to Border Trade，the Notice of the General Administration of Customs and the Ministry of Foreign Trade and Economic Cooperation on the Administrative Measures for Border Residents’ Trade，border residents in border areas are within 20 kilometers of the land border of China.By the open point approved by the government or the designated market，in not more than the stipulated amount of 8，000 yuan/day (free of customs duties and import link tax) for Commodity Exchange activities，maritime trade could not only solve the original trade market imported raw material channel single problem，purchase of raw materials from the ten ASEAN countries，to ensure the price of raw materials preferential，stable supply；but also greatly reduce the logistics cost of imported raw materials through sea transportation，which would be conducive to the development of border exchange commodity landing processing projects.Taking Dongxing Port of Beibu Gulf Port as an example，this paper sorts out the demand for port and production linkage development supported by maritime trade and landing processing，analyzes the status quo of port development and port construction conditions of Dongxing City，combines with the overall spatial layout characteristics of Beibu Gulf Port，proposes the site selection scheme of Dongxing Port.It provides a technical reference for promoting the upgrading of China-Asean cooperation and building a processing industrial cluster of border people’s trade commodities in a trinity of “seaport，trade market and processing”.

Abstract:The dredging of rivers and lakes in China produces a large amount of waste silt every year，which has long consolidation period，low curing strength and heavy metals，and is difficult to be used as resources.In this paper，ultrafine metakaolin geopolymer is used to study its influence on the solidification strength，water stability coefficient and heavy metal consolidation effect of the silt.The results show that with the increase of ultrafine geopolymer content，the strength of silt solidified soil gradually increases，and the 7 d unconfined compressive strength can reach 1.68 MPa，which has excellent silt solidifying effect.The water stability coefficient increases first and then decreases，and the water stability coefficient of the silt solidified soil mixed with ultrafine metakaolin is more than 90%，which is more than twice that of the pure silt soil.The ultrafine geopolymer has good consolidation effect on 6 kinds of heavy metal ions such as cadmium and lead，especially on cadmium and mercury，and the leaching amount of 6 heavy metal elements in each group of silt solidified soil does not exceed the requirements of relevant standards.The solidification and heavy metal consolidation effect of the ultrafine geopolymer on the silt is good，which is quite different from the ordinary Portland cement solidifying material.

Abstract:To explore the law of damage and degradation of anti-corrosion coatings on steel components of inland ports under water-sand erosion conditions，experimental research is conducted on the damage and degradation of coating materials under different erosion conditions using a self-made water-sand accelerated erosion wear device.Based on image recognition technology，digital and binary feature extraction is carried out to hedge the surface topography of coatings after corrosion damage.The gray threshold of distinguishing pixel pores is set to quantitatively analyze the damage form and degradation area of the coating surface.The results show that when the inflow angle is 45°，the damage and deterioration of the coating are the most serious，and the pitting ratio and scratch ratio are roughly the same.The damage and deterioration area of the coating increases exponentially with the increase of the inflow velocity.When the sand content is less than 45 kg/m3，the increase of the sand content can promote the damage and deterioration of the coating，but when it is more than 45 kg/m3，it reduces the damage and deterioration rate of the coating，which realizes the damage and deterioration law analysis of the steel component coating under the erosion condition of inland river and sand without damage.

Abstract:Under the current policy of sea area use，application of permeable wharf is more viable.This paper combines engineering example，comprehensively considers natural conditions and usage requirements，and addresses problems of conventional pier wharf under low elevation，heavy load and shallow batholith conditions.Through theoretical calculation and physical model tests，the structure is analyzed and compared for stress，and optimized from the perspective of convenient construction.A prefabricated caisson pier wharf structure is proposed.The new structure can meet the requirements of low elevation of wharf surface，resist considerable service loads and wave force，improve the adaptability to uneven settlement of the foundation，and provide a more economical and convenient structural selection for the construction of permeable wharf structures in areas where geological conditions are not suitable for using pile foundation structures.The prefabricated caisson pier wharf has been applied in the Lanshan Port area of Rizhao，which provides reference for the construction of permeable wharf under similar conditions.

Abstract:For the sheet pile wharf on soft soil whose foundation is treated by deep cement mixing (DCM)，the deformation control of sheet pile is one of the design difficulties.In this paper，a deep-water sheet piled wharf on deep soft soil is researched.Finite element simulation is carried out by PLAXIS software.The internal force and deformation characteristics of the front wall under different replacement ratios of DCM are analyzed，the deformation results of front wall from different layout of DCM and tie rods are compared，and the influence of rear preloading on the deformation of anchor sheet pile and soil is studied.Finally，the foundation treatment procedures，DCM replacement ratio and layout，and tie rod arrangement are optimized and designed.The design scheme can better limit sheet pile deformation and shorten the overall construction period while ensuring the economy of the scheme，which can provide reference for similar projects.

Abstract:The southeastern coast of Hainan Island experiences frequent typhoons，and the nearshore wave limiting heights can reach up to 10 meters，making the port construction conditions harsh.The structural safety of the breakwater becomes a key challenge for port construction in this sea area.This paper studies the stability of the sloping breakwater based on the South China Sea emergency salvage support base project，and conducts stability experiments on different types of armor blocks and bottom blocks of the breakwater using a three-dimensional wave physical model.The results indicate that the stability of the breakwater foundation directly affects the stability of the armor blocks in this strong wave areas.Increasing the mass of the bottom blocks to achieve stability is not effective，while adopting an embedded bottom protection can improve stability and minimize the mass of the bottom blocks，thereby meeting the stability requirements of the breakwater armor blocks and saving engineering investment to some extent.

Abstract:In the design of small and medium-sized high pile wharf，PHC prefabricated pile has good corrosion resistance and high bearing capacity，which is widely used，but its penetration ability and impact resistance are weak.In the coastal area of Weifang，Shandong Province，there is a silty sand layer with shallow burial depth，large thickness and high blow counts，which makes the pile penetration more difficult.Therefore，the PHC-steel pile composite pile is proposed.Based on the pile foundation modification design of a 5 000-ton multi-purpose wharf project in river estuary area，the rationality of the scheme is comprehensively demonstrated from the aspects of pile foundation design，finite element analysis，static load test and high strain detection.Furthermore，the reduction factor of pile end bearing capacity is proposed，which provides a certain basis for the calculation of vertical bearing capacity of similar projects in this area.

Abstract:Regarding the increasing variety and quantity of pipelines at the comprehensive wharf and the growing difficulty in pipeline laying，a new type of trench structure design is proposed.This design facilitates the laying and maintenance of multiple pipelines，while meeting the requirements for pipeline layout and personnel access.By introducing holes at the front and rear edges of the traditional transverse beams and laying longitudinal beams in the trench，a spatial system is formed that runs below the wharf surface，allowing for the utilization of the double-deck function of the high-pile beam slab wharf.The three-dimensional solid element modeling using Midas Civil calculation software is employed to calculate and analyze internal forces.The results show that the internal forces in the transverse beam structure meet the standard requirements.Additionally，a comparison between the horizontal distribution coefficient of the wharf structure and the standard distribution coefficient shows that the data is basically consistent，ensuring the rationality and safety of the lateral force distribution of the support frame.This structural design can serve as a reference for similar types of wharves.

Abstract:To ensure the safety of loading and unloading operations，the design of automated container terminals focuses on how to separate the flow of internal automated vehicles from the flow of external trucks.Water to water transshipment is the main collection and distribution model in many container terminals in the world.The ratio of water to water transshipment is different，the ratio of containers entering and leaving the port on the seaside and landside of the terminal is different，and the requirements for the horizontal transportation system in the port are also different.In view of the limitations of the existing traffic diversion technology schemes in automated container terminals on the adaptability of ratio of water to water transshipment，we propose a new traffic diversion technology with high and adjustable ratio of water to water transshipment in automated container terminal，and analyze the adaptability to water to water transshipment ratio adjustment of the process，which can provide reference for the planning and construction of similar automated container terminals.

Abstract:For a linearly arranged wharf consisting of operation platform，mooring dolphins and steel catwalks，the conventional design approach considers the independent stress of the three structures，weakening the transfer of forces between them.This paper proposes an integrated structural design scheme of mooring dolphin and steel catwalk suitable for a specific layout from the perspective of collaborative force among the three parties.The specified structure and force analysis method are introduced along with engineering example.A comparison is made between the integrated structure and the traditional high-piled dolphin structure in terms of force distribution and engineering costs.The results show that under the premise of meeting the functional requirements，the integrated scheme effectively leverages the overall force advantages of the structure，reduces the quantity of mooring dolphin and steel catwalk，and subsequently lowers the engineering cost.

Abstract:For gravity caisson quay under hard bedrock conditions，riprap prisms are usually installed behind the caissons to reduce the width of the caissons，and reduce the amount of reef blasting within the excavation range of the foundation trench.This article relies on an overseas project to analyze and study the relationship between the height of the prism and the engineering cost，so as to explore the optimal design rules of the riprap prism.The results show that the engineering cost is the lowest when the height of the riprap prism is about 60%~80% of the height of the caisson.When the hard rock surface is lower than 1/2 of the height of the caisson，the optimal height of the riprap prism is about 60% of the height of the caisson.When the hard rock surface is 1/2 higher than the height of the caisson，the optimal height of the riprap prism is about 80% of the height of the caisson.The laws revealed in this article can be used as a reference for similar projects.In practical projects，multiple factors such as engineering geological conditions，ground material prices，and construction capacity should be comprehensively considered to analyze and determine an economically reasonable prism height.

Abstract:The navigation environment of Yuanjiang Bridge is very complicated，and the layout of the original bridge is unreasonable，which seriously restricts the construction of the second-line lock expansion project of Taoyuan Hub.In view of the problem of poor navigable conditions in the bridge area，the layout scheme of the bridge navigable hole on the left bank is studied，using the method of combining the bed river model and small scale ship model test，and comprehensively analyzing the steering angle，drift angle and speed of the ship model test.The results show that under the same total navigation width，the double hole two-way is better than the double hole one-way.The right movement of the navigable hole of the bridge can reduce the difficulty of ships crossing the bridge downstream at the first-line lock，but it will increase the difficulty of ships crossing the bridge upstream at the second-line lock.It is suggested that the net width of the navigable hole of the new bridge on the left bank should not be less than 220 m.The bridge position should be shifted to the right by about 75 m compared to the current bridge.The navigation method should be adopted with double holes two-way and two line locks divided into slots.

Abstract:The water and soil erosion in Three Gorges Reservoir area fluctuation zone has caused significant changes in the river regime in some sections，affecting the safety of ship navigation.Wave erosion is one of the main causes of soil erosion on the bank slopes of the reservoir area.To further explore effective protection technologies for the bank slope of the reservoir area’s fluctuation zone，a flume test is conducted to study the wave erosion resistance of a new ecological slope protection structure，the terra block mat.The degree of soil erosion is calculated through needle measurement and wave pressure is measured by pressure sensors in this test.The results indicate that compared to the unprotected bare soil，the relative erosion of the protective section of the terra block mat under different working conditions is only 19.71% to 35.89%.Moreover，under the action of waves with a wave height of 4 cm and a period of 1.37 s，the terra block mat has varying degrees of weakening effect on the waves，with the most obvious weakening effect at a slope of 25°，and the wave pressure decreases by 20.46%.The terra block mat has good resistance to wave erosion and can be used for further research in the practical engineering.

Abstract:In view of the problems encountered in the layout of gate area and brake section in the approach channel of lock by applying the general design code of lock，the connotation of brake section，entrance，entrance area and connection section of the approach channel of lock are expounded from the perspective of shipping safety.This paper introduces the existing standards of navigation safety at home and abroad and points out the existing problems，analyzes the water flow characteristics in the entrance area of the approach channel and the principle of ship rudder efficiency，and puts forward a feasible method of judging water flow conditions in the brake section for lock navigation safety，which has certain reference significance for the whole model test and the overall layout of the lock.

Abstract:Aiming at the problems that the design standards of floating bollards in inland lock are different and the key parameters are not scientific and reasonable，the height of floating bollards and key parameters of pontoons are studied in this paper.The structural characteristics and application scope of several typical structural types of floating bollards are summarized by analyzing the design parameters of floating bollards and lock operating experience，and the value range of the mooring height of floating bollards that can be applied to various levels of lock is obtained，as well as the value basis of pontoon draft depth ratio，pontoon diameter and pontoon height.The research results can effectively guide the selection of key design parameters of lock floating bollards，which is of great significance for promoting the standardization and serial design of lock floating bollards.

Abstract:The hydrodynamic environment of habitat has an important influence on the survival and reproduction of fish.Aiming at Wanglongqi Reach which is in the upper reaches of the Yangtze River，we use three-dimensional flow numerical simulation method to discuss the influence of waterway regulation project on the hydrodynamic indexes of the spawning habitat of Myxocyprinus asiaticus.The results reveal that the velocity distribution of each section of the river is “high in the middle and low on both sides” along the river width.After the regulation project，the optimum spawning velocity area of each section shifts to the right，and the offset increases with the increase of the flow，with the maximum offset of 60 m.The vorticity is distributed in layers along the water depth，with a general pattern of “large in bottom layer and small in surface layer”.After the regulation project，large vorticity values are concentrated in the vicinity of the project area and in the middle of the river section，and the vorticity distribution is changed significantly along the vertical line.With the increase of the flow rate，the vorticity variation are amplitude increased，and the maximum variation amplitude is 0.05 s-1.The distribution of kinetic energy gradient along water depth is similar to that of vorticity，and the characteristics of kinetic energy gradient distribution along river width are strongly correlated with water depth.The maximum kinetic energy gradient of each section is increased with the increase of flow rate.The complex hydrodynamic conditions formed after the regulation project are conducive to the survival and reproduction of fish.

Abstract:Aiming at the problem of conditions for waterway falling below planned scale in the Wangyemiao to Lanjiatuo river section of the upper reaches of the Yangtze River，we use the method of statistical analysis of the multi-year waterway forecast scale and the measured water level data，and refer to the actual waterway maintenance experience.It is concluded that the key waterways of this section are Wenzhongba，Dongxikou，and Chayuqi waterways.Conditions for waterway falling below planned scale of each key waterway are that the water level of Yangjiaotan in Luzhou is 0.95 m，the water level of Doulizi is 0.3 m，and the water level of Xiaotaozhu is 0.6 m.The plan to reduce the maintenance scale is reducing depth to preserve width.

Abstract:Aiming at the development plan of Songliao Canal，to connect Songhua River and Liaohe River systems and reflect the comprehensive advantages of water transportation，this paper adopts qualitative and quantitative combination，comparative analysis and other methods to obtain the location function of the canal，transport cargo，river condition，ice condition，water resources，flood，sediment，geomorphology，river bridge，water and so on.To reduce the canal length，save the cost，and consider the comprehensive utilization of earth and rock and the long-term water resources protection，the canal alignment and layout scheme of 24 steps and water head control from Songnen junction to Liaohe，Hunhe and Daliao River are proposed to realize comprehensive development benefits of the canal.It will play a role in shipping，diversion of water from the north to the south，flood control and drought relief，improvement of soil and water environment，and construction of a canal economic belt.

Abstract:To ensure the basic navigation function of the channel during the construction phase of Lize Navigation-Power Junction，according to the results of the 1:100 normal fixed bed physical model test for the construction diversion and closure of Lize Navigation-power Junction，we analyze the navigable flow conditions and cofferdam closure test in the third stage of construction diversion period from the perspectives of velocity，flow pattern，navigable flow and navigation route，and obtain the calculation parameters of different closure widths.The results show that the test results obtained from the proposed diversion cofferdam scheme for the third phase of construction can well solve the navigation problem during the construction period of this navigation-power junction in terms of flow velocity，flow pattern and other water conditions.

Abstract:Aiming at the problem that the dark moraines in the Guanyinbei reach of the upper reaches of the Yangtze River can not be washed effectively and the shallow area is easy to become shallow and hinder navigation，this paper proposes two different regulation schemes，establishes two-dimensional mathematical model of the reach by numerical simulation method，and studies the regulation effect after implementation of the two schemes.The results show that after the implementation of the scheme，the water depth in the shallow area is above 3.5 m，which achieves the expected regulation goal.The local water flow pattern is significantly improved，and the maximum flow rate increase of the two schemes under the design flow rate is 0.798 m/s and 0.995 m/s respectively.Scheme 2 has a greater impact on the river boundary conditions than scheme 1，and the local beach elimination judgement is more than the critical value of 3.92，which is unfavorable to the passage of ships.Therefore，scheme 1 is selected as the recommended scheme for the beach.The results of the study can provide support for the determination of the subsequent regulation schemes in this section of the river.

Abstract:With the development of urbanization，the upsize of ships and the change of freight demand，the freight functions of most low-grade inland waterways in Zhejiang Province have gradually weakened，and gradually changed to the development of leisure，tourism，sightseeing，ecology and other complex functions.In view of the lack of relevant regulations on the navigation technical scale of the waterway dedicated to inland tourism，to give full play to the tourism and ecological functions of the low-grade inland waterway and ensure the safe navigation of tourism ships，this paper studies the technical standards such as channel scale and representative ship type involved in the construction of special waterway for inland tourism in Zhejiang Province by analyzing the differences between tourism and tourism ships and freight and cargo ships，formulates the navigability standard of Zhejiang tourism channel，and provides technical support for the development of low-grade freight lanes for tourism.

Abstract:The fluctuation of the water level of the Three Gorges ship lift is influenced by the peak shaving of the power station，the discharge of the ship lock and other factors，and the change is very complicated，and the water level variability at the head of the lower sluice can reach 0.9 m/h.During the operation of the Three Gorges ship lift，the shutdown failure caused by water level fluctuation accounts for about 29%，which often affects the operation safety of the ship lift.In this paper，the influence of water level fluctuation on ship lift operation is studied by collecting and analyzing the fault data of ship lift operation and shutdown.Suggestions on water level monitoring are put forward from four stages，including the early stage of operation docking，the docking period between the chamber and lock head，the opening period of the chamber，and the period of chamber connecting channel.The trend of water level should be predicted in advance in the sensitive links that are easily affected by water level fluctuation，the law of water level fluctuation should be mastered，and the corresponding measures are taken timely to avoid shutdown failure of the Three Gorges ship lift.

Abstract:In response to the traditional design issues of restricted waterway revetment engineering in inland rivers，such as lack of intuitive two-dimensional expression，low design efficiency，and complex mapping and calculation processes，this article adopts BIM，GIS，and other technologies for secondary development to form a series of BIM based digital design technologies for revetment engineering.It realizes the optimization of three-dimensional terrain surface interpolation，automatic generation of the front and side lines of the revetment，rapid parameterization creation of revetment engineering models，and mapping and calculation.And relying on the project to carry out technical achievement verification and digital delivery of design achievements，it improves the efficiency of BIM design for revetment engineering，expands the application field of digital intelligence of design achievements，and provides reference for the implementation of digital intelligence work in similar projects.

Abstract:In a container terminal planning stage，a design value of annual throughput capacity usually can be got according to the formula to calculate.Design and the actual gap of throughput capacity is large，due to the instability and imbalance of the time，the size，the deadweight，the loading and unloading volume of vessels to the port and so on.Taking a container terminal as an example，a handling system macro simulation model of container terminal is established by using computer simulation software FlexSim.Considering the influence of berthing annual capacity and yard storage capacity for the annual throughput capacity of a whole container terminal，its evaluation indexes are displayed.Based on the analysis of the simulation data of the terminal，the evaluation value of annual throughput capacity of the container terminal is 2.6 million TEU.The reasonable assessment of container terminal’s annual capacity can provide a scientific basis for terminal management decision-making and improve the service level of the terminal.

Abstract:Regarding the BIM bidding problem in the bidding process of water transportation engineering，a bidding requirement analysis，tool selection，and scheme visualization process research are conducted.Based on the BIM bidding process of a water transportation project，a domestic bidding platform is used to comprehensively integrate the bidding content and publish offline bidding documents.This solves the problems of integrating multiple types of models，integrating multiple source data resources，integrating bidding content and solutions，visualizing solutions，and interactive reporting during the bidding process.Finally，the BIM model is used to complete all bidding work.The conclusion is that the domestically produced bidding platform has obvious advantages in BIM bidding and interactive reporting of water transportation engineering，and can meet the requirements of BIM bidding at the current stage.This study will provide reference and guidance for BIM bidding in similar bidding of water transportation engineering.

Abstract:For the slope stability evaluation of a sloping revetment located in a high seismic zone in Philippines，we analyze the study of these international seismic design codes，propose an appropriate seismic slope stability analysis method，stability criteria，and analysis process based on the specific design conditions of the project，and use the Newmark method and non-linear dynamic analysis to calculate the lateral deformations of the sloping revetment after earthquakes.The results indicate that the stability analysis of sloping revetment in high seismic zones should aim to control the lateral deformations，which under Level 1 and Level 2 earthquakes are advised not to exceed 5 cm and 30 cm respectively.When using the Newmark method for calculation，its upper bound displacement should be taken，and the distribution of residual displacement and maximum shear strain obtained from the nonlinear dynamic analysis can provide a more comprehensive design and evaluation of the seismic slope stability

Abstract:This article focuses on the complex geological characteristics encountered in the reinforcement of the complex interlayer foundation between land and sea in a port project in Bangladesh，which makes it difficult to predict the reinforcement effect，as well as the problem of seismic liquefaction in the soft clay and fine sand interlayer soil site.Based on the geological conditions of the project site，functional requirements for site use，engineering characteristics and other conditions，the reinforcement effect of the combination of plate pre compression and precipitation dynamic compaction under the site conditions is studied.Based on the experimental block of the project，by comparing and analyzing the physical and mechanical indicators of the soil before and after reinforcement，and studying the settlement time history curve，pore water pressure time history dissipation curve，etc.，the process characteristics of inserting plate preloading combined with precipitation dynamic compaction reinforcement and the reinforcement effect on the original soil and hydraulic fill soil are obtained.The results show that the combination of plate precompression and precipitation dynamic compaction method has good adaptability for complex interlayer soil filling sand sites，and the reinforcement effect can meet the design bearing capacity and post construction settlement control requirements.This method has a certain effect on reducing the liquefaction of sand layers.The research results have certain guiding significance for guiding the design of complex interlayer soil reclamation sites in South Asia

Abstract:While applied to improve the slope stability，layout of DCM (deep cement mixing) is directly related to the rationality of the structure，which in turn affects stability and safety of the slope.As for current engineering practice，it is noted that there is still a certain misunderstanding of the stress mechanism on condition that different DCM layouts are adopted to improve slope stability.Based on 3D finite element method and combined with different layout patterns of DCM (in columns，latitude walls，longitude walls and grids)，overall stability，displacement and stress of the reinforced slope are analyzed.Displacement and stress distribution laws of the reinforced slope with different DCM layouts are studied.The research shows that DCM in longitude walls and grids are significantly improving the overall stability safety factor of the slope，reducing the DCM displacement and stress and making their distributions more reasonable compared with DCM arranged in columns.Of all the comparing layout patterns，DCM in longitude walls has the greatest advantages.

Abstract:The reclamation of dredging silt to form land areas is a high-quality solution for resource utilization and environmental protection.However，in the construction of land areas formed by reclamation of soft soil，most of the projects are small load storage yards，industrial park roads，and green areas，etc.Taking the foundation treatment project of the reserved storage area behind the 200 000-ton bulk cargo berth of the Qingdao Port Dongjiakou Port area ore terminal project as an example，we expound the design，construction and 6 years after use of the project in detail，and show the evolution of deep hydraulic fill soft soil during the construction and 6 years after use from multiple aspects.We carry out a detailed introduction to the changes in soil moisture content，pore ratio，shear strength and other indicators during different periods，compare settlement calculation and monitoring data during construction，and analyze the height of ore storage under different shear strength indicators during different periods.The results show that it is feasible to use hydraulic fill soft soil to form land areas in high load ore storage yards.Through reasonable foundation treatment methods and orderly increase of storage loads，the ore storage yard can ultimately achieve full load storage.

Abstract:In response to the complex working conditions of heavy cutter suction dredgers excavating sandstone mixed mudstone，this paper takes Qinzhou Port East Channel Expansion Project as an example to carry out construction technology research on the excavation and transportation of sandstone mixed mudstone soil by “Tiankun Hao” cutter suction dredger.Through comparative experiments between 7G and 8G six-arm cutter，the production efficiency and tooth loss of different cutter types are comprehensively compared，the dredging equipment is compared and selected.By analyzing and optimizing key construction parameters such as footage and cutting thickness during the construction，combined with the soil characteristics，the optimal excavation construction technology is determined.By analyzing and calculating performance of the mud pump，optimal control concentration for the transportation is determined.The construction technology optimization is carried out from two aspects of excavation and transportation，the construction technology of heavy-duty cutter suction dredgers for excavating sandstone mixed mudstone is summarized.The research results can provide reference for the construction of cutter suction dredgers under similar working conditions.

Abstract:Cutter is a core component of cutter suction dredger，and it is very expensive to study the excavation performance of cutter through field test.To solve the problem of meeting the suitable soil quality in the real ship test difficultly，a method to characterize the excavation performance of the cutter by excavation test and numerical simulation in the laboratory is proposed.Scale model of 2 000 kW power cutter and rock model with different uniaxial compressive strength are made.Model tests of cutter cutting rock with different cutting thickness and stepping distance are carried out in the laboratory，and 1:1 scale cutter numerical model and rock model are established.The cutting process of 2 000 kW cutter is simulated by unit deletion method，and the cutting processes with output of 240 m3/h and 500 m3/h are simulated respectively，and the cutting power and the cutting power of cutter are analyzed.The results show that when the excavation output is 240 m3/h，the maximum power is 1 884 kW and the average power is 1 088 kW，which meets the design requirements.

Abstract:To explore the ship motion response and mooring cable force of rock drill sliding on deck barge track，the 3 850 DWT deck barge is taken as the research object.AQWA module of hydrodynamic analysis software ANSYS is applied to analyze three drilling conditions of rock drill at the front，middle and back ends of track，and to compare the differences between barge motion response and mooring cable force.The results show that the pitch and roll of barge will change obviously when the rock drill is drilled at different positions on the ship.In addition，the different displacement caused by different oil and water has a certain effect on the barge’s rolling and pitching response，and the mooring cable force of barge has little change under different working conditions.The research results can provide some reference and guidance for the evaluation，selection and countermeasures of large equipment operating on deck barges.