Abstract:The Pinglu Canal is the backbone project of the western land-sea new corridor,and it is also the first grand canal built to connect the river and sea since the founding of new China.Its navigation flood control is of great significance.This paper establishes a two-dimensional hydrodynamic mathematical model of the Pinglu Canal's river structures,simulating the water flow patterns and hydrodynamic axis situation of the canal's navigation channel under flood control standard conditions.The results show that the water flow patterns and hydrodynamic axis of the Pinglu Canal navigation channel after dredging and construction are more conducive to the discharge of floodwaters and the long-term stable operation of the canal.The research results can provide reference for the planning and management of the Pinglu Canal.

Abstract:With the development of inland water transportation,the research and construction of large-scale artificial canals have continued to advance,so as the higher ecological and green requirements throughout the entire construction process.On the basis of the characteristics of the Pinglu Canal project and key ecological and environmental issues,we explore the construction and layout of ecological corridors along the canal.By dividing the corridor into aerial,underwater,terrestrial,and riverbank sections,we propose the design of ecological facility nodes such as animal passages and ecological conservation areas to enhance the connectivity of different ecological patches along the entire canal.By summarizing the construction and layout of ecological corridors for the Pinglu Canal,as well as the research of layout and design emphasis of ecological node facilities,we aim to provide valuable insights and references for the ecological construction of other cross-basin artificial canals.

Abstract:Aiming at the lack of operation standards of waves for the handing operations of moored ships under longer period wave action,a systematic analysis and research has been carried out.In this paper,physical model tests on the hydrodynamic characteristics are conducted for a series of oil tankers,LNG vessels and bulk carriers considering a large wave period range.The variations of ship motion with wave period are analyzed,and combined with relevant regulations,the reduction coefficients for the wave height of ship operation under longer period waves action with period variation are proposed.The research results can provide scientific support for relevant research and design.

Abstract:To study the sediment deposition characteristics of typical silted tidal flats in Jiangsu Province,a cross-section survey was carried out at Yangkou Port in July 2021.The results show that there is a normal semi-diurnal tide in the study region.The current is southwestward during the flood,and gradually become northeastward during the ebb.The wave is obviously forced by the strong wind,and the wave height is obviously enhanced,the current mainly changes with the tidal cycle.The strong waves in windy period contribute to the disturbance of the water column and conducive to the suspension of sediment.The bed shear stress is mainly contributed by the current.The combined shear stress of wave and current is weaker than the critical erosion stress in most of the time,resulting in the settling of suspended sediment.On the whole,the suspended sediment is transported southward along the coast and parallel to the shore.

Abstract:We obtain varying degrees of corroded reinforcement specimens from prototype and accelerated corrosion members.Using 3D laser scanning,we caculate and statistically analyze the residual cross-sectional areas of each corroded reinforcement specimen.We study the relationship among the comprehensive corrosion rate at the cross-section of corroded reinforced concrete and the overall corrosion rate of corroded reinforced concrete,as well as the number of reinforcements using Monte-Carlo sampling algorithm,and carry out a comparative analysis of the performance characteristics of these two corrosion rate indicators in the assessment of the bearing capacity of corroded reinforced concrete beams.The results show that the generalized extreme value distribution model provide the best fit for the probability distribution of residual cross-sectional areas of corroded reinforcement.The ratio α of the comprehensive corrosion rate at the cross-section and the overall corrosion rate of corroded reinforced concrete decreases as the overall corrosion rate of corroded reinforced concrete and the number of reinforcements increase.On the basis of the comprehensive corrosion rate at the cross-section,the residual bearing capacity of corroded reinforced concrete beam can be predicted more accurately.

Abstract:Dayaowan port area is the core port area of Dalian Port,a large-scale container terminal area has been built on the south shore operation area,but the north shore operation area has not yet been developed.It is the most important foreign trade container reserve port resource of Liaoning coastal ports.Since the implementation of the strict control of reclamation policy,the external constraints on the planning and construction of container terminals have become more complicated.This paper takes the north shore operation area of Dayaowan port area in Dalian Port as an example to explore the container port intensive planning method under the resource and environmental constraints.It studies the optimal use of shoreline and land resources,quantifies and refines the spatial requirements of land functions.Based on the model analysis and scale calculation,the optimization scheme of shoreline and land area arrangement is proposed.The results of the study show that following the demonstration process of “transportation demand - land demand - plan scheme”,through the plan layout of “big and continuous shoreline” and the functional layout of “terminal production area + comprehensive land area”,the matching degree between demand and plan can be effectively strengthened.While ensuring the full capacity of the terminal,efficient and intensive use of sea land can be achieved,and the coordinated development of the port and resource environment can be realized.

Abstract:As a common type of high-piled pier structure in harbors,the optimization of pile arrangement for mooring dolphin is a complex nonlinear problem.Traditional methods based on experience and adjustment encounter difficulties in handling this issue.This paper establishes a mathematical model for optimizing pile arrangement based on the classic genetic algorithm.By binary encoding various pile foundation parameters and combining with the post-processing strategy for pile collision constraints,and using computer programming languages,the genetic iterative evolution of pile arrangement for mooring dolphin is implemented.The optimization results of the model demonstrate that the application of the classic genetic algorithm can achieve good convergence performance and optimization effects for pile arrangement problems,and meet the feasibility and practicality requirements of engineering design,providing a reliable solution for the optimization of pile arrangement for mooring dolphin.

Abstract:Green development of ports has become an inevitable trend as China has strengthened and promoted ecological environment zoning controls.In the process of building Ningbo-Zhoushan Port into a world-class strong port,it faces increasingly strong resource constraints,such as land,water and shoreline,so it is urgent to promote intensive and efficient utilization of the port's shoreline resources to further improve the transportation efficiency of the system.To better serve the implementation of national strategies and the high-quality development of regional economy and society,based on “improving the quality and efficiency of used resources,rational guidance of stock resources,and prudent and coordinated use of new resources”,the intensive and efficient utilization modes and application scenarios of different port shoreline resources are analyzed.The principles of “green development,efficient utilization,reasonable intensification,coordination and balance,supply and demand adaptation,and classified policy implementation” are adhered to.Otherwise,this paper proposes guidance and measures for the new round of overall revision of the shoreline planning of Ningbo-Zhoushan Port in terms of rigid and elastic combination and precision management,dynamic supervision and virtuous cycle,making initiative and ecological priority,and implementing the green concept throughout the life cycle.

Abstract:Aiming at the determining method for the crest elevation of low-crested sloping island breakwater,we discuss key factors affecting the design of the crest elevation of low-crested sloping island breakwater on the basis of existing research findings and the engineering practice under study.For situations where strong waves are scattered and common waves are concentrated,we propose a design concept that the crest elevation should make the secondary waves behind the breakwater and design waves of the non-protected wave direction substantially equivalent,and compare and analyze results of physical model tests in engineering cases.The results show that the proposed design concept is rational and feasible,which has reference significance for the design of similar future projects.

Abstract:The semi-vertical and semi-sloping breakwater is widely used in breakwater project because of its advantages of “multi-purpose of one breakwater”.The outer sloping structure has strong adaptability to wind and waves,and has certain shielding effect on waves.The inside vertical structure can be used as wharf to realize mooring and platform operation functions.At present,there are few researches on semi-vertical and semi-sloping breakwaters in the code,and the wave dissipation effect and wave force reduction coefficient of sloping breakwaters are lack of theoretical support.In this paper,combined with engineering examples,a physical model test is carried out to verify,the measured wave data are compared with the calculated values of the wave forces in front of the vertical wall and on the top of the sloping wall in the code,the difference between the conclusions of the two methods and the results of model test is analyzed,and the values of wave force reduction coefficients at different locations are proposed,the structural stability is checked by the measured values of wave force test and some suggestions are given.The research results can provide reference for similar projects.

Abstract:To solve the problem of shared deep-water shoreline between the wharf and the water intake,taking the reconstruction of Ligang power plant bulk cargo terminal in Shili Port District of Wuxi (Jiangyin) Port as an example,combined with the navigation and hydrological conditions of the project area and the characteristics of the reconstruction project,this paper analyzes different proposals of power plant bulk cargo terminal.Adopting the method of numerical calculation and theoretical research in different working conditions,the influence of hydrodynamic conditions in front of wharf under the scheme of wharf structure spans over the water intake is analyzed.The results show that when the wharf built with a transparent structure and spans over the water intake,the water intake has little influence on the hydrodynamic conditions of the wharf apron,and basically does not affect the normal berthing and operation of ships.It will achieve intensive and efficient utilization of shoreline,which provides a reference for the planning and design of similar projects.

Abstract:Aiming at the large plane scale,high water transfer intensity,limited width of downstream common approach channel,possible backflow,oblique flow and other hydraulic problems of Jiantan double-line ship lock,a physical model with a scale of 1:30 is used to study the navigable flow conditions at the outlet of Jiantan double-line ship lock and the downstream approach channel.The results show that it is reasonable to adopt partial lateral drainage arrangement at the sluice of Jiantan double-line ship lock.Adding a permeable water separation wall can weaken the backflow strength of the barrier head.When the double-line lock drains at the same time,the flow velocity in the common approach channel is large,and the flow velocity can be reduced to the standard limit by adopting the mode of cross-peak discharge or reverse operation.After taking the corresponding optimization measures,the hydraulic indexes of the drainage outlet and the lower approach channel of Jiantan Lock water delivery system can meet the design and specification requirements under the design of the most unfavorable head combination condition.The research results can be used as reference for similar projects.

Abstract:In order to study the shoal protection effect and hydrodynamic characteristics of spur-dikes under the condition of low sediment concentration,the measured topographic data of 2014 to 2021 are used to quantitative analysis the evolution characteristics around the north dikes of Qingcaosha Reservoir after the implementation of spur-dikes.The hydrodynamic and frontal incident waves' characteristics of spur-dikes are simulated under the terrain in 2014 and 2021 on the basis of the numerical model MIKE21.The results show that siltation appears in dam field shoals between 2014 and 2021,with a maximum siltation thickness of nearly 10 meters after the implementation of spur-dikes in north dikes of Qingcaosha Reservoir.The rates of erosion and siltation in shoals slow down,after the elevation of shoals reaches 0 m,they remain stable with a slope between 1:3 and 1:5.There is no scouring pits formed at the head of spur-dikes,which may be related to the fact that the elevation of the Xinqiao Channel has reached -15 m before the implementation of spur-dikes.With the sedimentation of shoals in the dam field,the tidal current velocity of the beach near the main channel is increasing.The amplitudes of tide levels and significant wave height under simulated conditions are less than 0.03 m,which is basically not affected by the siltation of the dam field.The spur-dikes has protection effects under low sediment concentration,which can be used to build the foundation of beach protection projects for the Yangtze River Estuary's water flow erosion embankments.

Abstract:Flow partition ratios of branching channels are easily altered by sand mining activities in bifurcating reaches,which affects flow conditions of shipping channels and may threaten navigation safeties.To investigate the impact of sand mining in Jinshi and Taihu embankments at the lowest reach of Yuanjiang River on hydrodynamics of nearby shipping channel,we use data of riverbed terrain and hydrology in 2016 and 2022 to establish numerical model of planar 2D flow motion,from which hydrodynamic changes are calculated for different terrain and hydrology combinations before and after sand mining.The results show that beach-channel regime is stable in the study reach,and no obvious change of the navigation-channel dimension and sediment deposition is triggered by sand mining.The flow partition ratio of the middle branch will be enhanced by larger than 7.12% if blocking dams within this branch are destroyed by rush of water after sand mining.The minimum water depth in the navigation channel is still larger than 3 m after sand mining,which meets the navigation requirement.The blocking dams reduce the water surface slope by 4‰ between the entrances of the study reach and the bifurcating area.If blocking dams are destroyed after sand mining,water level along the main shipping channel will drop by 0.10 m in dry season.The whole flow field changes little before and after sand mining.Flow velocities around the two embankments decrease and the maximum deflection angle is smaller than 23°,which do not hamper sand dredger access.Blocking dams reduce flow velocity in the middle branch by 0.52 m/s in wet season.Blocking dams control the overall stability of river regime and prevent the middle branch from erosion and development which might lead to steep water-level drop,dimension shrinkage and even rerouting in the shipping channel.Meanwhile,high flow velocities occur around mining area boundaries and scour beaches,so it is recommended to protect the blocking dams and beaches.

Abstract:In response to the limited construction site and large fluctuations in upstream and downstream water levels,the traditional layout types (open and enclosed) of water-saving basins of locks cannot meet the design requirements well.A new layout type of water-saving basins is studied,and the concept of combined layout is proposed.That is,some water-saving basins are horizontally staggered relative to the other part,and some water-saving basins are also vertically staggered relative to the other part.By adopting this layout type,it can not only adapt to narrow site conditions but also adapt to large fluctuations in upstream and downstream water levels,which well meets the design requirements.This layout has been adopted in the support project and has entered the construction phase.This technology can provide reference for the design of water-saving shiplocks under similar conditions.

Abstract:The angle of the confluence of Shaping River and Yu River is small,which is unfavourable for ships to turn and navigate,especially for ships entering and leaving Shaping River from the upper reaches of Yu River.In addition,a large number of residential houses are distributed on the islands on the right bank of the channel at the confluence,which makes land acquisition and demolition difficult.How to balance the navigation conditions with less land acquisition and less excavation is a difficult point in the channel route layout of this section.To achieve good seaworthiness and safety of ships in the canal channel,two channel routes are arranged according to the principle of straight line as the main and curve as the auxiliary.Through the comparison of technology and economy,the channel line with safe navigation,low construction difficulty and low engineering cost is selected.Furthermore,the representative ship type is selected and electronic channel chart is established for the ship manoeuvring simulation test.The ship model test shows that the channel width and turning radius of the optimised design meet the requirements of navigational safety.

Abstract:The upper reaches of the Yangtze River from Yibin to Chongqing is an important part of the Yangtze River's golden waterway,and under the combined effect of natural and human factors,the water and sediment conditions in this section has changed to some extent recently.The trend of runoff and sediment,mutability and cyclic change characteristics of the Yibin to Chongqing section of the Yangtze River are analyzed,based on the prototype observation data of runoff and suspended sediment transport from 1956 to 2020 at the Zhutuo and Cuntan stations of the Yangtze River ( abbreviated as two stations ).The results show that:1) The runoff at Zhutuo station shows an increasing trend,the runoff at Cuntan station shows a decreasing trend,but neither is significant.The sediment load at both stations show an unusually significant decreasing trend.2) Runoff and sediment load of the two stations have mutation characteristics,runoff mutation occurs from 1960 to1969,and runoff mutation also exists since 2000,and the mutation of sediment load mainly occurs from 2000 to now.3) Runoff at Zhutuo station has the most drastic cyclic oscillations under the 28 years time scale.The average cycle of runoff change is about 19 years,which is equivalent to experiencing the conversion of 3.5 water-abundance periods and dry periods.The sand content shows obvious cyclicity under the 93 years time scale,and the average cycle of runoff change is about 57 years.In the sequence of runoff at Cuntan station,the cyclic changes are more obvious under the time scales of 14,28,and 47 years,and the main cycle of the change of the sediment load at Cuntan station is about 93 years.

Abstract:The Babao double-lane ship lock is a key node project for the Beijing-Hangzhou Canal to connect the second channel of the Qiantang River.Its upstream and downstream approach channels are arranged in a shared approach channel.To ensure the safety of ships passing through the ship lock when the double-lane ship lock is operating,we measure parameters such as water flow conditions in the approach channel and ship berthing conditions through real ship tests and hydraulic observations,and analyze the navigation safety of the ship lock.The results show that the water surface in the approach channel fluctuates between -0.29 m and 0.38 m,which will not cause the ship to rub against the bottom.When the double-lane ship lock is filled and discharged at the same time,the maximum flow velocity in the approach channel is 0.44 m/s,the maximum instantaneous reverse water head at the ship lock herringbone gate is 0.143 m,and the maximum mooring force of the ship is 5.74 kN,both of which meet the code requirements.When the ship lock operates in a single line,it will not affect the entry and exit of ships on the other side of the ship lock.

Abstract:To the problems of large land acquisition area and large excavation volume caused by the use of a straight approach channel layout scheme upstream of the Linhuaigang double track ship lock,a separated approach channel layout scheme and a broken line approach channel scheme optimized for lock efficiency are proposed.To the problem of complex water flow conditions in the upstream and downstream approach channels,physical model experiments are used to optimize and verify the design scheme of the approach channels.The experiments show that the lateral water flow velocity in the original design scheme exceeds the standard,and the downstream approach channels experience severe backflow.The lateral water flow in the upstream and downstream is mainly controlled by the width of the approach channel.Expanding the width of the approach channel to 65 m can effectively improve the lateral water flow conditions.To the problem of local non-compliance with downstream water flow conditions,a ship model operation simulation test is used to verify the required navigation width.After verification,the flow rate of the Chengxi Lake drainage gate is less than 300 m3/s under the flat channel discharge water level,and when the flow rate of the Chengxi Lake drainage gate is less than 100 m3/s under the lowest navigation water level,the approach channel width that meets the standard water flow conditions is 45 m,exceeding the required navigation width for safe navigation of ships.

Abstract:To the problem of navigation obstruction in the Taoyuan hub ship lock,this paper takes the construction project of the Taoyuan hub second line ship lock in Yuanshui as the project basis,and uses two-dimensional dynamic numerical simulation method to study the navigable water flow conditions of the river section from Taoyuan Hub to Zhouwenmiao Hydrological Station.Based on the analysis of parameters such as water depth,water level and flow velocity under multiple working conditions,the navigable flow conditions and obstructed beach sections of the hub and downstream waterway are studied,and the channel improvement measures such as trench dredging are proposed according to the beach risk problem.The results show that under the existing terrain conditions,the navigation obstruction problems of working conditions 1 (Q=217 m3/s) and 2 (Q=380 m3/s) are prominent in the river section 0-20 km and 80-95 km from Taoyuan hub,and when the flow rate is greater than working condition 3 (1 233 m3/s),it meets the requirements of Class III channel scale.Through mathematical model verification,measures such as trench dredging can effectively improve the navigable water flow conditions of the waterway.

Abstract:There is the bottleneck of the high-grade waterway downstream of the Yuan River,and the problem of insufficient capacity of the first ship lock at Taoyuan Hub.It is necessary to build the second ship lock at Taoyuan Hub.We compare and optimize the design schemes of the left and right banks of the ship lock by building a 1:100 integrated fixed bed physical model,and propose a series of improvement measures for navigation flow conditions of the approach channel and the entrance area.The results show that the navigation flow of the new ship lock scheme on the left bank can basically reach a flood flow rate of once every ten years,but it is necessary to rebuild three floodgates,which has a significant impact on the main structure of the hub,the flood discharge capacity of the left branch,and the stability of the riverbed.In addition,dismantling the navigation and diversion embankments on the left side of the first ship lock will lead to a significant reduction in the navigation guarantee rate of the first ship lock.The implementation of a plan to reduce the upstream excavation depth,arrange a submerged dam in the upstream connection section,optimize the length of the diaphragm wall,and expand the width of the navigation channel for the right bank ship lock can significantly improve the navigation flow conditions of the approach channel and entrance area,making it meet navigation requirements.

Abstract:To the rapid fluctuations of water level in the approach channel of the Three Gorges ship lift,the unreasonable selection of the docking position of the ship chamber affects the safe and efficient operation of the ship lift.This article has carried out the optimization of the ship chamber docking scheme of the Three Gorges ship lift to cope with water level fluctuations.The study proposes the establishment of a temporary berthing area for ships passing through the chamber and a method for determining the docking position of the ship chamber,achieving rapid and accurate docking between the ship chamber and the waterway.It summarizes the optimization plan for the docking of the Three Gorges ship lift cabin and verifies the changes in the impact of water level fluctuations before and after on-site verification.The results show that compared with the original plan,the optimized scheme can improve the rationality and accuracy of the docking position of the ship lift,at the same time effectively reduce the impact of water level fluctuations on the ship lift,providing a more effective docking method for safe and efficient operation of ship lifts built on natural rivers.

Abstract:In response to the problems of unclear management boundaries,inconsistent identification principles,and blank navigation standards in the identification of navigable inland water areas,this article combines the delineation of navigable inland water areas in Shanghai,and proposes six types of water areas that can be identified as navigable water areas by sorting out laws and regulations,technical standards,and management documents for navigable water areas issued by various regions.These include current or planned waterways,waterways with operating docks,waterways with cargo ships,waterways with important geographical locations that can provide supplementary support to the existing waterway network,area where water tourism business activities are planned to be developed,and waterways with no docks or ships but still possessing certain navigation capabilities.Water areas with poor navigation conditions and no planned use requirements,as well as urban garden water areas,should not be recognized as navigable water areas.In addition,based on the principle of moderate rationality,navigation standards are proposed for navigable waters such as rivers and lakes.The research results can provide theoretical support and technical reference for the management of navigable water areas.

Abstract:The filling-emptying system,which is a key parameter in lock design is the core of a ship lock,and its design directly affects the lock's carrying capacity.In response to the large-scale filling-emptying,and high requirements for hydraulic indicators and conveyance efficiency of the Weishan third-line ship lock,the hydraulic characteristics,ship berthing stability conditions,and dissipation facilities of the filling-emptying system under various working conditions and layout of the filling-emptying system are studied by a physical model test with a scale of 1:30.The results indicate that the lock design is optimized technically and economically by removal of inlet grilles and the use of vortex plates at the inlet.The arrangement of energy dissipation work at the outlet and the optimization of the navigation wall shape for the downstream approach channel guidance significantly improves the water flow conditions.Under valve opening mode of optimized layout of the filling-emptying system,all hydraulic indexes can meet the requirements of the design and the codes,and the overall design of the filling-emptying system is reasonable and feasible.

Abstract:The Liujiang Class Ⅱ waterway is an important part of the northbound route of southwest water transport to the sea，but the transportation capacity is insufficient.The feasibility study on the construction of the Liujiang Class Ⅱ waterway is carried out according to the distribution of natural resources of regulation river reach,the current situation and planning of social and economic development and industrial layout,and shipping development prospect.The design standards and principles of the Liujiang Class Ⅱ waterway are built.A method for calculating the size of the waterway are proposed according to the navigation rate and the class of the waterway,and the flow of Liujiang Class Ⅱ waterway is calculated on the basis of the minimum navigable water level and the stage water level-flow of the river section.The beach section waterway route scheme is proposed to realize the construction of a total length of 170 km and 2，000-ton level of Class Ⅱ waterway according to requirements of the bending radius of the Class Ⅱ waterway and the convenience of use and maintenance,inview of the freight volumes in 2025,2035 and 2050 are 26.7 million tons,48.1 million tons and 65 million tons respectively.

Abstract:When the expansive soil slope alternates between dry and wet,the slope soil will have obvious shrinkage-stretch and strength attenuation,which will easily lead to slope landslide and sliding accidents.Therefore,it is extremely important to obtain soil parameters quickly and accurately for treating and repairing expansive soil slopes.On the basis of the indoor soil test parameters of a waterway regulation engineering,the sensitivity analysis of soil parameters of the expansive soil slope is carried out by orthogonal test with the horizontal displacement measured at different depths by the actual layout of inclinometer tubes as the evaluation index.Then the soil parameter inversion model of the expansive soil slope is built by the least squares support vector machine（LS-SVM）,and the inversion model is verified.The soil parameters after inversion are obtained,and then the forward calculation of the most unfavorable conditions with obtained soil parameters after inversion for the treatment and restoration of the expansive soil slope is carried out to predict and analyze the deformation of the expansive soil slope.The results show that the inversion model based on the LS-SVM can realize the dynamic design of site construction and the prediction of slope deformation during the construction period.

Abstract:Bagged sand has been widely used due to its fast construction period,low cost and strong adaptability.However,there are few studies on the liquefaction of bagged sand,especially in high-intensity seismic areas,where bagged sand cannot be compacted like hydraulic fill sand.Under strong earthquake conditions,the liquefaction deformation of bagged sand embankment has become a non-negligible factor,and the liquefaction problem has become a restriction on the promotion and application of bagged sand embankment in overseas high-intensity seismic countries and regions.In this paper,FLAC 3D is used to analyze the dynamic response of the bagged sand embankment under strong earthquakes,such as liquefaction degree and acceleration,and measures to reduce liquefaction are proposed.It can be used as a reference for the promotion and application of bagged sand structure in the Southeast Asian market.

Abstract:In response to the deterioration of reinforced concrete caused by long-term operation in harsh environments in a large number of whaves built in the twentieth century,relying on the reinforcement and repair project of Ningbo-Zhoushan Port phase II wharf,we design different basalt fiber products to use for targeted reinforcement and repair,which include using double-layer basalt fiber cloth (300 g/m2 to 380 g/m2) combined with adhesive to reinforce the panel,implanting basalt fiber reinforcement combined with steel sleeve support formwork to inject C40 underwater non-dispersed concrete for increased cross-section method,and adding basalt fiber mesh combined with concrete for surface layer crack control reinforcement.Combining with the construction process,we achieve the comprehensive application of basalt fiber cloth,reinforcement,and mesh in the old wharf,and evaluate the application effect of about 2 years after construction.The results show that there is no bulging or peeling phenomenon in the basalt fiber cloth,and there are no harmful cracks in the basalt fiber mesh and reinforcement composite concrete structure.The overall appearance quality is well.

Abstract:This paper mainly introduces a new construction technology suitable for dredging construction of dredging dredger, namely dynamic delamination and depth determination technology. Firstly, sensitivity factor analysis is used to sort the importance of each factor affecting the trimming time of dredging engineering, and then the mechanism of each factor's influence on the smoothness is analyzed one by one. Finally, the calculation formula of dynamic stratified depth determination is constructed according to the analysis results, which can be used to calculate the different depth settings for phased construction. The whole process is to strengthen the stage control of the flatness in the construction process, so as to reduce or even eliminate the late trimming time, reduce the corrugation caused by the early stage of the project, and ultimately reduce the construction period and improve the project income. This paper also shows the feasibility and advantages of this construction technology through its application in Yangshan Phase 4 infrastructure project.

Abstract:In the reef clearing construction of the channel project,the impact of the construction on the adjacent buildings needs to be considered if there are adjacent buildings near the reef clearing area.To avoid the adverse impact on existing nearby buildings in the Western Land-Sea New Corridor,Pinglu Canal,channel project,the project uses the cyclic impact of a high-frequency breaker to break the rocks,which is more efficient and environmentally friendly.Aiming at the applicability of the high-frequency hammer for reef clearing in sensitive areas,a numerical simulation calculation model of the high-frequency hammer for reef clearing is established based on 3DEC,the dynamic response rules of the rock mass under high-frequency vibration impact are studied,and the range of application of the HB3600 hammer for the reef clearing construction is proposed.The results show that the HB3600 hammer is suitable for rocks with a compressive strength within 30 MPa and the rock-breaking efficiency decreases beyond this range.The stress generated inside the rock mass under the impact of the breaker gradually decreases as the distance from the hammer tip increases,the vertical stress has a greater impact within the range of 0.95 m and the lateral stress has a greater impact within the radius of 0.5 m.

Abstract:When pouring concrete thin-walled structures such as drainage ditches,due to the narrow feeding port of the template,the thin-walled structure that needs to be continuously poured is longer,and the internal steel bars are denser,which limits the speed of concrete pouring and leads to serious waste of material.A thin-walled component pouring auxiliary device is developed combined with a certain wharf yard project,which has the advantages of smooth feeding,continuous construction,low device cost,and reusability.When pouring concrete for drainage ditch walls,the device overcomes the drawbacks of traditional drainage ditch pouring methods,such as low efficiency and excessive waste of concrete,and improves the efficiency of drainage ditch pouring construction by 50%.