Abstract:Hydro-floating ship lift is a brand new type invented in China，which is especially suitable for the ship lift of large tonnage or with large water level variation in approach channel，so as to have broad application prospects. Based on the Yantan expansion project，we propose the overall layout of the 2×1 000 t hydro-floating ship lift，innovate the hydraulic driving system，improve the flow conditions of the shafts on the premise of ensuring the stability of the tower column structure，guarantee synchronized and stable motion of the balance weights，and apply the one-dimension mathematical model to calculate and analyze the running characteristics of ship lift. The calculation results show that the design of kiloton hydro-floating ship lift is reasonable and feasible，which can provide references for the similar projects.

Abstract:During the water level design process of lock with water saving basins （WSB），its an important part that to determine the water level and head of the WSB，and there are many influencing factors in the process. This paper derives and establishes calculation formulas for evaluating the water level and the water head of the single step lock with WSB，which integrates the total head of ship lock，the upper and lower stream water level variation，the number of the WSB levels and area of the WSB，and the remaining head. On the basis of formulas，the influence of factors such as the upper and lower stream water level variation，the number of the WSB levels and the area of the WSB on the water level and the water head of the WSB are analyzed. Finally，the water levels and water heads of difference WSB schemes are calculated and compared in a 60 m single-level ship lock，and a reasonable water level scheme of WSB is proposed.

Abstract:Due to the small section coefficient of the ship chamber，the ship entering and leaving the chamber is a complex three-dimensional water flow problem coupling with ship operation，and the hydraulics problem is very complicated. It is necessary to formulate reasonable ship draught control standards and ship navigation methods based on the ship squat to prevent the ship from touching bottom so as to ensure the safety of ship navigation and ship lift docking.Firstly，this paper introduced the navigation characteristics of the ship in and out of the chamber，analyzed the main affecting factors of ship squat，sketched out the theoretical analysis and formula derivation of previous research，and summarized relevant empirical formulas. Secondly，the calculation results of various empirical formulas were compared and analyzed for the process of ship entering and leaving the ship chamber. Finally，the future research direction and content on ship squat of ship lift were put forward.

Abstract:The navigable building of Longtan hydropower station is a two-stage vertical ship lift with an intermediate channel，and the designed ship type is a 1 000 t-class mobile barge. By the method of physical model test，the experiment of ship out of the Longtan second stage ship lift chamber is carried out to study the hydraulic characteristics such as the water surface fluctuation in the chamber，the ship squat，and the force of the docking locking mechanism. The results indicate that from the perspective of ship lift docking safety and ship navigation safety，in order to meet the requirements of 1 000 t-class ship passing through the ship lift with a maximum draft of 2.4 m，the ships speed out of the chamber should be lower than or equal to 0.7 m/s when the ship chamber design water depth is 3.5 m.

Abstract:For further increasing the passage capacity of the Three Gorges ship lock，we propose the synchronous navigation technology of large aspect ratio ships with 4.5 m draught. We discuss the feasibility of this technology from two aspects including ship berthing safety and navigation safety through systematic actual ship test. The results show that the mooring force of the ship exceeds 200 kN in three typical periods of braking stop，filling and discharging the lock chamber and opening the miter gate. The mooring force is closely related to the ship displacement，the inertia water level difference and the initial water depth of the lock chamber，and there is no obvious influence on the mooring force of the mooring type. Based on the ship sinkage formula built by the measured data，it is predicted that there is no bottom contact risk when the speed of synchronous navigation ships with 4.5 m draught is less than 1 m/s. The berthing safety of large-scale ships is the key problem that restricts the further increase of the capacity of Three Gorges ship lock，while the safety of navigation is not the control factor.

Abstract:Seabed seepage is one of the key factors to be considered in the design of marine engineering design，which affects the stability of structures and even causes seabed liquefaction seriously. The existing related research of the interaction between waves and seabed has not solved the problem of simulation method of seabed in the laboratory yet. Based on this，we study the similarity rate of permeable sandy seabed model under wave action. Based on the condition that the prototype pore water pressure is similar to the model value，we propose a similarity criterion for simulating seabed in laboratory through a series of wave flume physical model tests. The results show that the relationship between the similarity scale of sandy seabed and model geometric scale is λseabed=λ1/3.

Abstract:Aiming at the practical problem of ship waiting for tide at the tide riding water level，based on the hourly data of tide tables at stations of different tidal types in Chinese coastal area，we study the continuous navigable window period and waiting time of ship under the tide riding water level of 2 h with 90% assurance rate by using statistical method，analyze the reasons for the differences of navigation window period and waiting time when diurnal tide changes to semidiurnal tide from the perspective of water level duration curve，unequal daily high tide and annual change of mean sea level，and discuss the degree of influence of riding time and assurance rate on waiting time. The results show that the navigation window period decreases and the waiting time of ships tends to prolong from the diurnal tide to the semidiurnal tide. The influence of assurance rate on waiting time is more obviously.

Abstract:The dredging equipment standardization work of China began in the late 1970s，and further developed in the 1990s and early 2000s，especially in the last 5 years. Aiming at the development and evolution of dredging equipment standardization，we apply the method of classification comparison and standard content analysis to discuss the development and evolution of Chinas dredging equipment international，national，transportation，shipbuilding，water conservancy industry and group standards，point out and analyze the development characteristics and current problems of dredging equipment standards at each stage，and propose the suggestions for standardization of dredging equipment. It can provide the references for research and compilation of subsequent dredging equipment standards.

Abstract:In order to evaluate design parameters of a new single-layer concrete armor unit-Crablock，which has been applied to a breakwater project in the Middle East，this paper analyzes previous physical model test results and compares main parameters of Crablock with those of 4 extensively used units，i.e. AccropodeTM，AccropodeTM II，Core-Loc and Xbloc. The results show that：1）The stability number of Crablock Ns ranges from 2.8 to 3.3，corresponding to KD value of 16 to 27，which has a better stability than the above 4 units. 2）The uniform rectangular placement pattern is recommended for Crablock，which differs from the random pattern of the above 4 units. 3）A smaller underlayer of 1/25 armor weight is proposed for Crablock，which is also different from the general underlayer of 1/10 of the above 4 units weight. 4）The overtopping roughness factor is not defined in the physical model test，but a value larger than 0.45 is verified. The actual wave overtopping shall be in accordance with the result from the physical model test.

Abstract:In the process of hydraulic filling，the dredged slurry should be filled in layers. The thickness of the layers is important to the consolidation of the dredged slurry. We use the settling columns with different height to carry out the settling experiments to the slurry with the same water content，and study the influence of dredged slurry height on the sedimentation law. The results show that with the same initial water content，the settling mode in a column with a lower slurry height tends to be consolidation settling，and the higher slurry height tends to be hindered settling. The initial height of the slurry has little influence on the settling rate when hindered settling occurs. The duration of the settling stage is proportional to the initial slurry height. The higher the slurry height is，the smaller the average water content of sediment is，and with the increase of slurry height，the average water content of sediment tends to be stable. When the slurry height is more than 40 cm in the scope of this study，the sedimentation rate and water content of sediment tend to be stable，and the settlement mode does not change any more. The slurry height has little effect on the sedimentation law.

Abstract:In view of the construction situation of the vehicle-passenger ferry terminal and the characteristics of the engineering sea area of Sijiao island in Zhoushan，we take the high-pile bearing bench structure as the research object，contrast under different design three kinds of high pile bearing bench structure secondary waves wave height and transmittance，overtopping waves，the original design straight pile scheme and the revised schemes wave force through the wave section physical model test. In addition，we measure the water flow velocity at the crevice of the front wave baffle plate of the original design straight pile structure，integrate the whole physical model test to compare the test results of different schemes. The results show that the wave condition in front of the breakwater in the straight pile structure is worse than that in the inclined pile structure，while the wave condition behind the breakwater in the inclined pile structure is better. The structural design elevation is close to the wave action area，both overtopping and breaking wave impacts are strong，so the drainage and force of upper structure should be focused in the design.

Abstract:The design theory and design criteria of the French standard port pavement design method are significantly different from the British standard method. Based on the Alize-LCPC software，we calculate the pavement thickness under different dynamic and static loading conditions and the bearing capacity of the foundation，and compare with the calculation result of British standard. The results show that the calculation results of the French standard have a better correlation with the actual stress state of the pavement structure. The calculation results of the French standard are more reasonable when the bearing capacity of the foundation is higher and under heavy load or light load times are more than 1.5 million. When the load bearing capacity is lower and heavy load times are less than 0.75 million or light load times are more than 3.1 million，the calculation results of the French standard are more reasonable. The bearing capacity of the foundation and the angular distance of the container have a greater influence on the calculation results of the French standard.

Abstract:Large-tonnage ships or ships with less navigation quantity are generally considered to enter or leave the port by tide and arrange anchorage for waiting tidal due to the lack of port coastline. Aiming at the problem that there is no suitable calculation method of anchorage number for waiting tidal window，we propose the factors affecting anchorage number for waiting tidal window including ships arrival regular pattern，tidal characteristics and channel management based on investigations，existing standards and by theoretical method analysis，obtain a calculation method of anchorage number for waiting tidal window by analysis of influencing factors，and verify the method by the actual example. The results show that the calculation method is reasonable and feasible，and can provide the references for anchorage planning and design.

Abstract:The excavation of foundation trench is one of the most important step of the design and construction of gravity wharf. With the vigorous development of the national infrastructure，coastlines with favorable conditions are developed and utilized rapidly，so more and more wharf engineerings have to be implemented under the complicated condition，for example，the front line of the wharf is too close to the revetment to excavate foundations with slope. To ensure the stability of revetment and satisfy the wharf construction，a higher standard is required for the support of excavation of the gravity wharfs foundation trench. This paper studies the application of tree root pile in the support of excavation of gravity wharfs foundation trench. Based on the theory of composite foundation and according to the application result of the tree root pile in the support of excavation of gravity wharfs foundation trench，the conclusion is drawn that it is feasible to adopt the tree root pile for the support of excavation of the gravity wharfs foundation trench.

Abstract:Rolling transportation in China is mainly concentrated in Bohai bay，Qiongzhou strait and Zhoushan islands. Dalian port in Bohai bay has become an important channel connecting the north and south economic arteries of China. In order to adapt to the trend of large rolling capacity of passenger ships in Bohai bay，improve the utilization rate of port resources，and meet the transportation demand of rolling market in Bohai bay，the comprehensive evaluation system for the site selection of super large ro-ro passenger berth is constructed from the four aspects of market demand and city supporting conditions，tourism resources，port infrastructure and foreign comprehensive transportation to make a comprehensive evaluation of the alternative port sites. Through the evaluation and analysis，considering the current situation and future development trend of the alternative port sites，it is recommended that the eastern part of the Heshang island port be selected as the site of ro-ro passenger berth.

Abstract:We analyze the surveyed terrain and hydrodynamic data in Fujiangsha reach from 2010 to 2015，carry out the sediment transport experiment on fixed bed physical model，apply a three dimension tidal hydrodynamic and sediment transport model to study sediment transport of beach in Fujiangsha reach. The results show that the transport speed of cutting beach shows positive correlation with the driven factors，such as discharge，the height of beach and upstream face angle. The critical discharge which Jinjiang beach transport after eroded integrally or downstream part cutting off is 40，000 m3/s. The water area from Jinjiang beach to Fubei waterway is the main bed-load transport channel. The upstream discharge is the main hydrodynamic factor which determines the sediment transport pattern in Fujiangsha reach and river bed evolution. Fuzhong channel is the main path for bed-load transport at small discharge，and Fubei channel is the main path for bed-load transport channel at huge discharge. Severe siltation in Fubei channel will appear since much sediment transport into Fubei channel at condition of huge sustained discharge.

Abstract:Using ANSYS finite element software，the whole model of the ship lift with ultra-high -lift rack and pinion including pillar，ship chamber，lifting system and the foundation is established，and the dynamic characteristics of the ship lift structure are calculated and analyzed. The results show that：1）The main low-order characteristic modes of the hoisting system and the ship lift include lateral swing，the vertical torsion and the longitudinal swing，and the natural vibration frequency of the cabin with a ship is less than that of the cabin without ship. 2）Comparing the pillar-foundation system model，modified HOUSNER simplified model with a ship，and the fluid-structure interaction model，it is found that the main mode frequencies of the overall structure model of the ship lift after considering the hoisting system are all reduced；the modified HOUSNER simplified ship model and the fluid-structure interaction model have similar natural frequency values，and the natural frequencies of simplified ship model system are less than the entity model of the ship.

Abstract:This paper analyzes the hydraulic problems in discharge capacity，energy dissipation and navigation flow condition after the layout of Tangba navigation-power junction in mountainous river. Then，based on the physical model ，the hydraulic problems such as the low energy-dissipation rate of bottom flow， the increase of tailrace water level and poor navigation flow condition are analyzed and optimized，and the measures such as changing the form and scale of stilling basin，excavating the riverbed，expanding the diaphragm wall and blocking water to navigation are put forward，which effectively improve the flow conditions and ensure the normal operation of the navigation-power junction.

Abstract:In view of the narrow and curved river of Maojiaokou and Jiaotanwan in the main stream of the Zijiang Ｒiver，we carry out the scheme design for channel regulation by cutting，dredging and slotting，etc. and analyze it by conducting the physical model，mathematical model and ship navigation test for. The analysis of the underwater bed topography and water level after project implementation reveals that the river bed of the navigation-obstructing is stable，the flow is smooth，and expected effect is achieved. Thus it may serve as reference for similar projects.

Abstract:The existing building structure on a river bank affected the flood water area，which made it unable to meet the flood discharge requirements and needs to be rectified.A new type of sub-step vertical frame bank protection structure was formed after rectification. However，the load-bearing characteristics，instability mode and stability of the structure were still unclear.Based on strength reduction method，the bank protection structure in this paper was analyzed using ABAQUS. The calculation results showed that：1）The failure of this new type bank protection structure was mainly due to large sliding of the soil on the bank slope. And its plastic failure mode gradually expanded from the contact point between the bank slope and the beam-column frame and substructure slided prior to superstructure till plastic deformation transfixing. 2） The calculated structural safety factor of the bank slope was 1.69，which was greater than the safety and stability factor 1.25 specified by the code，indicating that the bank slope was currently in a stable state. 3）Overall the new type of sub-step vertical frame bank protection structure needed less materials，and the beam-column structure was beneficial to enhance the stability of the structure and the band slop. Thus it was certain cost-effective and feasible as well.

Abstract:To counter the problems such as strong cross current and wide range of backflow at the downstream entrance area and connection segment of Jinggangshan navigation-power junction，we study the navigable flow conditions and optimization of the entrance area of the downstream approach channel of the navigation-power junction. Through establishing the overall fixed-bed model，we optimize the layout of the core wall，propose to shorten the core wall and add permeable core wall outwards the river center，so as to solve the problems such as strong cross flow and backflow，improve the navigation condition of the entrance area and connecting section of the lower approach channel notably，and meet the needs of safe navigation for the ship.

Abstract:With the development of the economy along the upstream of the Yangtze River，the construction industry is prosperous，and the demand for the sand increases rapidly，leading to an expansion of the sand excavation in the Yangtze River. The risk of the flood control and navigation safety is raised by the major sand mining. This study aims to investigate the scale of sand excavation and its influence on the gravel shoals. Based on the data set of the river bed level from Yibin to Fuling reach between 2007 and 2016，we obtain the distribution of the sand mining，and simulate the recovery process for the destroyed shoal by the 2D hydro-sediment numerical model. The results show that the amount of the sand mining is about 0.395 billion m3，the gravel shoals are destroyed，and the difference in elevation can reach to 40 m，which indicate that the influence of the sand excavation on the topographic change is beyond that of the channel self-organization and the channel regulation；the destroyed shoal cannot return to the original form，due to the reservoirs mulit-operation in the upstream and the limitation of the sediment storage in the channel.

Abstract:In order to reduce the adverse effect of the project on the estuary environment and improve the ecological effect，we carry out a study on the ecological embankment structure based on the Yangtze estuary south channel regulation phase I project. According to the ecological characteristics of the biological groups in the Yangtze estuary and the engineering influencing factors，we select the large benthic animals as the target biological objects，and analyze the habitat demand characteristics including key indicators of the dominant species. On this basis，we propose a new type of ecological hollow block structure made of porous polyurethane mixture （PPM），and give the design of embankment body structure；in addition，by the method of computational fluid dynamics，we compare and study the layout of blocks. The construction technology of the new hollow block structure is put forward，and the finite element analysis is carried out. Furthermore，the feasibility is verified by the actual construction test.

Abstract:The single safety coefficient method is used to calculate the anti-overturning stability and safety of hydraulic retaining wall in the current specification，without pointing out whether water pressure is an overturning force or a stability force. Aiming at the problem that the different calculation methods of water pressure have a great influence on the anti-overturning stability and safety coefficient，according to the calculation principle of single safety coefficient method，this paper compares the calculation results of the specification method and commonly used design software by specific computation example，and obtains the suggested formula. The results show that in order to make the calculated anti-overturning safety coefficient truly conform to the engineering safety level，it should regard the difference between the horizontal water pressure on both sides of the retaining wall and basement seepage pressure as the load，and weight of the retaining wall calculated by buoyant density below the water level in front of the wall as the resistance force.

Abstract:In order to optimize the calculation method of navigable width of channel in current code，a new analysis method based on AIS big data is proposed with corresponding software developed. Such program consists of relational database，CAD visualization technology，mathematical fitting algorithm，etc. As a result，it makes AIS big data fast analysis achievable by solving the defects，like massive raw data problem，data filtering difficulty，low resolving efficiency and so on，which in turn provides solid data support for navigable width calculation. Within the program，C#.Net is selected with UI framework WPF and SQLite database to jointly develop. Moreover，the research achievements have been utilized in the second phase of Lianyungang 300，000 DWT navigation engineering and yields good results，which have a reference significance for other projects using AIS bigdata for certain purposes.

Abstract:The application of BIM technology is researched for the refined design of dredging project in an overseas port. The 3D dredging model and geological model are established by software Civil 3D to realize the statistics of dredging quantities by soil category and generate standardized construction drawings，while ensuring the dynamic correlation among models，drawings and engineering quantities. Practice shows that the application of BIM technology can greatly improve the precision and efficiency of port dredging design and provide a theoretical basis for the engineering construction.

Abstract:Aiming at the problems of large project volume，difficult construction and large engineering error during construction of high-piled wharf，this paper carries out a research on the application of BIM technology to the construction of hydraulic docks. The application of BIM technology to the construction visualization，collision inspection，engineering quantity calculation，and construction organization design achieves remarkable effect in the construction quality，schedule and cost control of the high-piled wharf project. It may serve as reference for the practical application of BIM technology to the construction of the high-piled wharfs hydraulic engineering.

Abstract:Based on the ground treatment project of Zhuhai Offshore Engineering Building Base of China National Offshore Oil Corp marine engineering module final assembly site，and according to the engineering characteristics of heavy load and geologic condition of great fluctuation of the upper overburden，we design the soil consolidation schemes by dynamic replacement method and dynamic consolidation drainage method respectively in subregional ground，compare the ramming volume，excess pore water pressure and ground strength，obtain the dissipation rate of the excess pore water pressure and soil consolidation effect of different consolidation schemes，and verify the design parameters such as the ramming energy and interval time，so as to provide a basis for the large-area ground treatment and serve as reference for the popularization of the dynamic consolidation method in the soft soil foundation treatment .

Abstract:Based on the displacement of a ship lock foundation pit in the process of excavation，we apply the scheme and construction technology of prefabricated H-beam steel support in the reinforcement of deep soft soil foundation pit. In order to study the safety of prefabricated H-beam steel support with original double row pile support，we use the software of Lizheng 7.0 and GTS-NX to conduct modeling analysis，check the anti-overturning and overall stability of the reinforcement scheme and the axial force of the support，select a section of lock chamber foundation pit as the test section for construction，and compare the calculation results and monitoring results of excavation foundation surface. The results show that the overall stability of the reinforcement scheme and the axial force of the support satisfy the requirements of relevant specifications，and the development of horizontal displacement of deep soil can be controlled by using H-beam steel support.

Abstract:Considering the characteristics of the built breakwater around the filling zone 6 of Kuantan New Deepwater Port，Malaysia，which is connected to the shore and backfilling sand is easy to accumulate and not easy to loss，we adopt the method of non-cofferdam reclamation by setting silt curtain，which satisfies the environmental requirements of the locality. The results show that non-cofferdam reclamation method is feasible in specific environment，which can control the loss rate，shorten the construction period，meet the requirements of environmental protection，avoid the risk of overseas construction to a certain extent，improve the economic benefit，and be referred for similar projects.

Abstract:There is deep soft clay stratum in the project site of Amador cruise terminal project in Panama. Inorder to evaluate the residual settlement of the foundation based on the observation data during the dead loadperiod the hyperbolic method the three￣point method and the Asaoka method are used to predict the settlement.Aiming at the problem that it is difficult to determine the three equally spaced settlement points in the three￣point method starting with the minimum radius of curvature three settlement points are reasonably defined. Five typical time settlement curves are selected and a comparative analysis is carried out on the settlement of the observation points. The following conclusions are drawn 1 Predicted settlements from hyperbolic method is usually larger with the increase of settlement observation time the accuracy of the measurement will be improved. 2 Predicted settlements from the Asaoka method is similar to the stable value but they are smaller than the final stable value,which obviously makes the foundation settlement unsafe.3 Predicted settlements from the three￣points method are larger than the predicted settlements from Asaoka method and lower than the hyperbolic method which is closer to the stable value.4 The three settlement prediction methods are simple and practical and the predicted residual set- tlement is less than 150 mm which meets the settlement design requirements of the project.

Abstract:The main structure of sluice spans a wide and deep bedrock fault fracture zone or influence zone in Panghai navigation-hydropower junction by the Qingshui River. The anti-sliding stability of the building is unfavorable due to broken structure and low mechanical strength of rock mass.It is difficult to grout when the traditional grouting method is used. Through the experiments，a pulsed grouting method based on the principle of“dense grout compaction，stage grouting and controlling pressure by section” is proposed.Sonic test shows that this grouting method has good effect and can effectively improve the integrity of foundation. Combined with the arrangement of consolidation grouting holes，anchor piles are set connecting the foundation and building.The safety coefficient of anti-sliding of sluices is improved considerably by the working mechanism of anchor piles.Through the practical implementation process，the ground treatment of consolidation grouting combined with anchor piles is confirmed more rapid and economical，which solves the problem of building anti-slip stability of the sluices and achieves the desired effect.

Abstract:In order to understand the application effect and control strategy of environmental protection overflow pipe on the actual ship，combined with the actual mud tank size of the trailing suction dredger，the numerical simulation of the green valve in different angles of environmental overflow pipe is carried out by using the homogeneous flow model in CFX，then the air volume fraction in the overflow pipe with different horizontal angle of green valve is obtained. The results show that： 1） The green valve can significantly reduce the air entering the overflow pipe，and the volume fraction of the overflow pipe is significantly reduced when the horizontal angle of the green valve is 30°. 2）The inlet position and the working state of the overflow pipe also affect the air bubble content of the overflow liquid.

Abstract:The wharf beams have cracks due to the shrinkage of the concrete. Although such cracks have little impact on the safety of structures，but they provide intrusion channel for corrosion medium and have adverse effects on the durability of structure. Aiming at the problem of shrinkage cracks produced during the construction of the beam，relying on a certain wharf project，through on-site investigation and data analysis，the causes of cracks are studied. The research shows that the cracks in this project are mainly caused by the shrinkage of concrete，and the measures of reducing the water-cement ratio and adding steel bars can effectively achieve the purpose of preventing concrete shrinkage cracks.

Abstract:The geotextiles-laying vessel appeared “dragging anchor” during sinking of D-shaped soft mattress in Madang section for the 6 m depth channel regulation project in the section from Wuhan to Anqing of the Yangtze River main line due to deep water and large flow velocity. Some traditional measures，such as increasing the length of upstream anchor cable and dropping linking anchor were proved ineffective for solving the problem completely. Therefore，two construction schemes for increasing the mooring force were presented： scheme I is to add another geotextiles-laying vessel in the upstream of the working vessel，while scheme II is to replace the head beam of soft mattress with two concrete interlocking blocks so as to increase the friction force on the head of the soft mattress. This paper analyzes the mooring force and the stressed state of flexible mattress. The field tests indicate that the scheme II is feasible，but scheme I cannot solve the problem of “dragging anchor”due to multiple influential factors.

Abstract:In view of the key quality problems affecting the rubble mound breakwater with low body，based on the actual experience of the deep sea overtopping rubble mound breakwater with low body in the Shentou three-port basin of Yangpu Port，the key factors affecting the quality are analyzed. Some quality control measures and control methods have been adopted to effectively reduce the damage caused by the waves to the rubble mound breakwater on the low body of the breakwater and improve the quality of the project. It can provide references for similar projects to improve the stability of the port and improve the safety of the whole port.

Abstract:The fully covered platform method and the artificial foundation bed method are often used in the construction of bored piles without overburden，but there are some problems such as high cost and low efficiency. Aiming at these problems，we rely on Hubco coal wharf project in Pakistan，propose an integrated construction technology of bored pile based on the incremental launching platform supported on pile top，realize high efficient construction of bored piles in severe sea conditions and without overburden，apply ANSYS to analyze the whole construction process of the incremental launching platform，and study the key control parameters and calculation methods of the construction process. The results show that the structural strength and stiffness of incremental launching platform supported on pile top can meet the requirement under different load and working conditions. It provides a reliable mobile platform foundation for integrated construction technology of bored pile.

Abstract:Heavy cutter suction dredgers are mostly designed with upper and lower trunnions，and the maximum digging depth generally reaches about 35 m when lower trunnion is used. The maximum digging depth of the largest cutter suction dreger in the world today is 45 m. The cutter suction dredgers are limited by the minimum digging depth when using the lower trunnion for rock excavation.The use of ordinary traverse anchors will cause the traverse cable to repeatedly rub at the edge of the slope and cause broken wires and strands，so it is necessary to find a new method of anchoring to prevent this from happening. By studying the trunnion self-replacement scheme，using field tests and calculation methods，a set of construction technology of fast switching of the upper and lower trunnions and adopting the transverse anchor to drop the anchor and add the floating bridge is summarized. Using the construction technology of deep groove bedrock excavation，the production efficiency is greatly improved，and the excavation of the foundation trench is completed smoothly and efficiently.