Abstract:The operating conditions of filling and emptying valve in high head navigation lock are very complex during operation due to hydrodynamic load，which directly affects the hoist load of the valve. As the hydrodynamic hoist load is the key design parameter to determine the capacity and dead load of the valve，it is necessary to carry out special research. 1）Specific to reverse tainter valve，the influences of valve opening and closing rate，culvert type at valve section，and the water head on the hydrodynamic hoist load are analyzed. 2）By changing structure parameters such as panel structure，the shape of valve’s bottom edge，and arms wrapping，the influence of the shape resistance of valve on hydrodynamic hoist load are studied，and the relevant laws are obtained. 3）The field observation data of the valve hydrodynamic hoist load of the Three Gorges ship lock is used to verify the model test values. The results show that the two results are in good agreement，and the capacity and a dead load of filling and emptying valve in the Three Gorges ship lock can meet the requirements of the hydrodynamic operation.

Abstract:The water head and the flow energy of Wan’an 2nd lane lock are all among the highest single-step locks around the world. The filling and emptying system design is the key part of the lock design. According to the design code for filling and emptying system of ship locks and based on analyzing a great number of references，combined with the hydraulic simulation，the filling and emptying system with wall culverts，vertical divider，in-chamber 4 manifolds of Wan’an 2nd lock is put forward and optimized. The results of the model test（scale 1:30） indicate that the layout and design of the filling and emptying system of Wan’an 2nd lane lock is reasonable and doable，thus the filling（emptying） time，vessel’s berthing conditions，and flow conditions around the inlets and outlets and in the approach channels are all satisfying the requirements of the code and design.

Abstract:Based on the vacuum tank experiments，the cavitation characteristics of the filling and emptying valve of the water-saving ship lock with a water head of 60 m-class were studied. Through model tests，the cavitation source was ascertained，and the cavitation number under each opening degree was calculated. The cavitation range，cavitation form，and cavitation strength were also obtained.The defense measures for reducing cavitation erosion by aeration were put forward，and the reasonable aeration amount was recommended. The test results showed that automatic natural aeration at top-sealing sill of valve could suppress cavitation of itself and valve lip effectively，and forced aeration at drop-sill could reduce the cavitation occurred on drop-sill and upward slope of enlargement culvert. The combination of the two aeration measures could effectively solve the cavitation problem in the filling and emptying valve section of 60 m-class water-saving ship lock.

Abstract:In order to improve the operation reliability of single-stage ship lock，we carry out the reliability analysis of a single-stage ship lock system. Through the function structural analysis of the system and equipment，we draw the corresponding reliability block diagram，establish the operation reliability model，obtain the reliability of the single-stage ship lock system and equipment according to the failure statistics of each equipment in recent years，and propose the corresponding measure for the weak link of the system. The results show that the reliability of the miter gate and hoist of single-stage ship lock is the highest，and the reliability of the electrical control system is the lowest. The sensor and water stops are the weak links of the system. The system stability can be significantly improved by using redundant configuration，technology innovation，rapid maintenance，and other technologies.

Abstract:Given how to scientifically evaluate the operational supporting capacity of the locks，we study the evaluation system of the operational supporting of the locks.Focusing on the evaluation of the operational supporting capacity of the lock，starting from the core factors such as management mechanism，equipment management，navigation supporting and navigation service，we use the methods of hierarchical analysis，Delphi method，etc.，adopt the research means combining qualitative analysis with quantitative calculation，comprehensively determine the evaluation index and weight，establish the comprehensive evaluation method of the operational supporting capacity of the locks，and apply the method to a large single-stage lock in China to derive the comprehensive evaluation of the operational supporting capacity of the lock. The results show that the comprehensive evaluation of the operational supporting capacity of a large single-stage ship lock is excellent. The evaluation method basically conforms to the practical experience of ship lock field and management unit in recent years，and can be applied to similar projects.

Abstract:In certain conditions，shallow water waves may emerge in solitary waveform，causing wave effects on offshore structures. Based on diffracted wave theory，we derive the theoretical solutions to first-order solitary water wave diffraction by a V-shaped thin wall breakwater，and study the action rule of a solitary wave on the breakwater by calculating solitary diffracted wave forces on the V-shaped breakwater. By calculating diffracted wave force on the finite length vertical thin-walled V-shaped breakwater with the opening angle 180° while the finite length breakwater is enough long，we carry out effectively similarity comparison with the reflected wave force caused by a solitary wave on the infinite long vertical thin-walled breakwater. The results show that the maximum dimensionless wave forces on the breakwater caused by solitary wave are obviously larger than those predicted by small-amplitude wave theory under Airy same shallow water conditions，reflecting the nonlinear effect of shallow water wave. The variation of incident wave angle，opening angle of V-shaped breakwater，the ratio of breakwater arm length and water depth，and solitary wave characteristic parameter may have some influence on wave loads.

Abstract:The development of digital cities puts forward higher requirements for the basic data，and the demand for obtaining 3D spatial information of the surface is increasing day by day. AS-900HL multi-platform radar measurement system integrates a high-precision laser scanner and inertial navigation，which can be carried out on many platforms for data acquisition. It has the characteristics of high working efficiency，fast scanning，high density of measuring points，and various forms of results. This paper takes the topographic survey of the Baimalang to Yunfeng dam section of the Yalu River as an example to discuss the application of AS-900HL in river topographic survey. The terrain of this waterway section is highly undulating，and there is no direct contact measurement condition. Since the other side of the river is North Korea，there is no possibility of landing and setting up remote measurement equipment，nor is it possible to fly an unmanned aerial vehicle，which is a special river section that is very difficult to implement. Through exploration，route design，field collection，internal processing，and output，the feasibility of the system in waterway topographic survey is verified. This system is suitable for waterway topographic surveys，especially in difficult waterway sections. It can fill the gap that cannot be surveyed by conventional survey technology. To go further，it has a positive effect on the construction of the digital channels and digital cities.

Abstract:Considering the problem of water exchange in the encircled long basin with one entrance，taking Taiping Bay harbor in Dalian as an example，the layout of opening up a water exchange channel between the bottom of the basin and the sea was put forward. Based on a two-dimensional hydrodynamic and water exchange model，the effects of different opening widths and bottom elevations on water exchange were studied. The results show that the water exchangeability of the basin could be improved by more than 30% after the channel opening at the bottom of the basin，but channel bottom elevations have little influence. The research results are of reference significance for the planning of the encircled long basin.

Abstract:The berth operability determines the throughput capacity，thus it is very important for the engineering design. In international projects，owners and consulting engineers usually put forward clear requirements on the berth operability. However，the domestic project’s requirements for the berth operability are relatively vague. Investigating the analysis method of the domestic berth operability days，we find that the domestic statistical superimposed analysis method is usually used to deduct different factors （such as wind，waves，currents，etc.） affecting the number of days that the berth can operate based on the operation standards. This method is relatively inaccurate. Then，in conjunction with international actual engineering，we take the LNG berth as an example to introduce the overall process analysis method for the berth operability and elaborate the overall process analysis method and its two major points，which provides a reference for the calculation of the berth’s throughput capacity.

Abstract:In view of the complexity of the factors influencing the unloading capacity of the car dumper system，the lack of theoretical basis for capacity calculations，and the lack of actual operational data，we carry out a study on main factors influencing the capacity of the dumper’s unloading system based on actual engineering cases and statistical data. By the case study and computer simulation，we analyze the utilization rate，operating efficiency，matching of the rail yard layout and the dumper system and the impact on the unloading capacity，and propose countermeasures to improve the utilization rate and operating efficiency of the dumper and reduce its off-hours. It is an important measure to improve the capacity of the dumper system by adopting the vertical layout of the dumper yard，increasing the number of lanes at the yard，optimizing the traffic organization and production management and scheduling system to match the capacity of each part of the dumper system.

Abstract:The regulation of a bifurcated tidal estuary usually can lead to the water diversion ratio to decrease. At present，there is no quantitative assessment of the river regime effect of such diverging ratio reduction. Based on the DOU Guo-ren equation，the correlation is analyzed between the changes in water and sand conditions and river hydraulic geometry relationship of the North Passage since the implementation of the Yangtze estuary deep-water channel regulation project. The results show that：1）The theoretical adjustment range of river hydraulic geometry relation after the project is less than the actual change. The large-scale dredging and the decrease of local sediment concentration are the two important roles in balancing the actual adjustment of river hydraulic geometry relation. 2）At present，the low sediment content environment of the North Passage supports the increase of the average depth in the main trough，but the volume of the main trough still needs to be stabilized by dredging.

Abstract:The track width is an important parameter for channel planning and design，and it has always been difficulty in calculating the channel width. In view of the difficulty in obtaining the value of the calculation coefficient of the track width in the current standard，based on the ship simulator，this paper proposed a method of directly calculating the track width by using the simulation data，which divided the track width into the route offset and the space occupied by the ship itself. In combination with the channel in Taizhou Bay Bridge area，the track width under typical wind and flow conditions is simulated and compared the conclusion with the current specifications. The results of the two methods are basically consistent. It shows that this method is feasible and has good practical value.

Abstract:The project of recovery navigation in the Xiaoqing River has been started construction，among which the Jinjiayan Lock，the Wangdao Lock will become the first batch of locks with water-saving basins in China. According to the characteristics of the interconnection between the culvert of water-saving basin and the culvert of lock head for the Jinjiayan Lock，we analyze the possibility of direct water conveyance between the upstream or downstream approach channel and the water-saving basin，and propose the corresponding hydraulic calculation method. Based on the principle of considering both the filling time and the water-saving rate，we deduce the relational expression between the optimal time to open earlier the lock head valve and the time to close earlier the water-saving basin valve. The results show that the culvert layout of the Jinjiayan Lock makes the resistance coefficient of direct water conveyance relatively large and effectively limits the return flow. When the lock head valve opens no earlier than the optimal time，the change of the water-saving rate is tiny which can be estimated by the common formula，the influence of the culvert interconnection is negligible.

Abstract:In order to sample undisturbed riverbed sediments，a new type of bottom sampler is developed and applied to the study of back-siltation in the Yangtze estuary 12.5 m deep-water channel. The results show that the new bottom sampler has advantages in tightness，adaptability，success rate of sampling，quantity，and fidelity of sediment sample. The undisturbed sediment in the south channel （SC） and north passage （NP） includes sand，mud，mixed sand-mud，and layered sand-mud，and the types and variation characteristics of sediments reflect the sediment source and deposition process. Based on the grain size parameters of undisturbed sediment samples，the bedload transport trend in SC and the quantitative influence of bedload on back-siltation in the Yangtze estuary deep-water channel are studied.

Abstract:The shipping of the Yangtze River has the advantages of low carbon，environmental protection，large volume，and low energy consumption. In the construction process of the Yangtze River ecological waterway，we strengthen the design，scientific research，and implementation，adhere to the concept of “ecological priority and green development”，and insist on development in protection and protection in development，which not only significantly improves the passage capacity but also fully releases the green attributes of water. The next step will be to practice high-quality development，systematic research，the dissemination of complete sets of technologies，and the promotion of eco-friendly technologies.

Abstract:A large number of ecological projects are used in the river and waterway regulation for the middle Yangtze River in recent years，and great ecological benefits are obtained. However，there is an obvious cyan-yellow line on the ecological bank slope according to field investigation. Aiming at this problem，we take Xinchang bank protection project and Taohuazhou bank protection project in the middle Yangtze River as examples，divide the bank slope into the cyan-green zone and cyan-yellow zone by the cyan-yellow line，analyze the distribution characteristics and the formation mechanics of bermudagrass，and determine the design control elevation of the cross-section by the cumulative frequency curve of water level. The results show that the elevation of the cyan-yellow line is closely related to the controlling of the Three Gorges reservoir. The elevations corresponding to the cumulative frequency of 45% and 80% are the design control elevations of the ecological bank protection section.

Abstract:Aiming at the operational reliability of ship lift，this paper takes the drive system of gear-rack climbing mechanism ship lift as the research object，analyzes the impact of the number of faults and the time for maintenance on the operational reliability based on the reliability theory and the statistics of the operation and maintenance data of the drive system，calculates the operational reliability of the drive system and its components，and proposes the following recommendations to improve the operating reliability. It is necessary to attach great importance to maintenance，repair，optimization，and upgrading of electromechanical equipment such as drive gear carrier mechanism，electrical transmission equipment，sensor detection devices，and fully consider the convenience of equipment maintenance. The operation reliability calculation and analysis method are based on the number of faults and the time for maintenance，which can accurately reflect the operation reliability of the ship lift.

Abstract:The research process of the adjustment plan of the Dalian Bay water area under the influence of a cross-sea traffic project was introduced in this paper. According to the navigation environment in the Dalian Bay water area，the development trend of the port and related industries was analyzed and the representative ship types of navigation in each port area were predicted. Using the design scheme of the north bridge and south tunnel of the Dalian Bay cross-sea traffic project as boundary conditions，according to the conditions and navigation requirements of the bay waters，the safe distances between bridge and anchorage，bridge and channel boundary were reasonably determined by introducing the factor of representative navigation vessel length with certain assurance rate. Three solutions for the adjustment plan were given and compared. Issues that needed to be paid attention to during the subsequent implementation stage were put forward.

Abstract:Given the safety problems caused by the force and vibration during the operation of the medium and high water head sector lock gate，we combine with the sector gate in Longzhouyuan ship lock of the river diversion project from the Yangtze River to the Hanjiang River，study the static characteristics of the sector lock gate by using the finite element analysis software ANSYS，arrange the real-time online monitoring points at the corresponding maximum stress position，and apply real-time online monitoring technology to track and study the whole process of the performance，operation characteristics and health status of the triangular gate equipment. The results show that the real-time online monitoring of the working stress and dynamic characteristics of the main components of the sector gate is an effective means to solve the structural deformation，wear，vibration，defect expansion，and other problems of the gate，which is very important to improve the operation safety of the gate and ensure its normal function.

Abstract:The riprap spur dikes are widely used in waterway regulation projects，which can clearing sands with the converging flow，and protect the beach from erosion. However，the damage of riprap spur dike frequently occurs. For this phenomenon，movable-bed physical model tests are conducted on the damage of dikes in plain-river，and the common damage forms of spur dike are analyzed. It is believed that the collapse and loss of the block stones at the dam head are considered as the main factors causing the overall damage of spur dikes. That is，the stability of riprap spur dikes can be studied based on the damage of dam heads. Then，the meaning and solution method of flood damage evaluation indicator，and damage grade at the dam head are put forward. The indicator values of different damage degrees are given in combination with damage grade. As a recommendation，the selection of the maintenance time of the dike is provided. This method provides a new solution for the maintenance of riprap spur，and is conducive to the sustainable development of the regulation effect of riprap spur dikes.

Abstract:The typical working conditions are selected to calculate and analyze the various characteristics of water level，discharge，flow velocity，specific drop，etc. in the beach section through the unsteady mathematical model，and the influence of daily regulation on the flow conditions of Shaoqibei reach is obtained. The results show that under two kinds of daily regulation conditions，the unsteady flow from unsteady flow to Shaoqibei River has a certain influence on the flow conditions of the downstream channel and the control reach and maintenance facilities of the channel under the condition of unsteady flow from 1.01 m to 1.37 m. The influence on the channel’s flow condition under 4.5 m daily variation is greater than 3.0 m. The analysis result provides support for further optimizing the hub shipping scheduling scheme and waterway maintenance measures.

Abstract:Based on the discrete event dynamic system theory and computer simulation technology，we establish a logical model to realize the logistics functions of the coal transshipment system，the jetty handling system，and shuttle transportation，etc. By studying the capacity matching optimization，construction investment，and operation cost of the whole coal handling system，we obtain the analysis methods of construction investment and operation cost of different system combinations to determine the optimal configuration of loading and unloading system，which serves as a reference for the selection of the number of shuttles in similar transshipment system and a reasonable selection of jetty handling capacity.

Abstract:For the extension project of many port projects，the wave condition of the breakwater head is relatively bad and the transition and connection between old and new breakwater are complex. The design is difficult and the construction quality is more difficult to guarantee. Based on a foreign project，we optimize a design scheme with the minimum amount of removal armor blocks according to the design principle of cushion inverted filter. Combining with Civil 3D software’s function of the 3D model and 2D drawing，we propose a 3D design method to deal with the transition of various complex interfaces. The results show that the design of new and old breakwaters can be clearly and accurately completed by BIM 3D technology and an inverted filter design principle. Meanwhile，the 3D model provides an accurate and feasible reference for construction.

Abstract:Yudai Island is located in the lower reaches of the Yangtze River，there is a large lake behind the shore slope，so the problem of post-slope seepage is serious. To ensure the safety of the shore slope，improve the overall stability of the shore slope，and reduce the amount of soil erosion，the shore slope needs to be reasonably protected. Through the physical model，we simulate the seepage of the shore slope under the protective structure of the Terra blok mat and the shore slope of the bare soil section to carry out the comparison test，set several observation points，use MATLAB software to draw the three-dimensional topographic map before and after the seepage，and observe the displacement of the shore slope setting points. The results show that the maximum displacement of the observation point with the protection structure of the Terra blok mat after seepage is 2 cm，and the maximum displacement of the bare soil segment is 5.1 cm. The topographic maps of the Terra blok mat section before and after seepage are consistent，which can illustrate that the Terra blok mat has a good protective effect on post-slope seepage.

Abstract:It is difficult to avoid the different depths of the main cell and arc cell of straight-web sheet pile cellular into the soil. Based on the engineering example，the mechanical characteristics of the structure with unequal main cell and arc cell length are analyzed，and the key and difficult problems in the calculation are put forward. The three-dimensional numerical model is established to calculate the stability，deformation，and stress of the straight-web sheet pile cellular seawall with unequal main cell and arc cell toe-levels，and the feasibility of reducing the depth of the arc cell sheet pile is analyzed. Combined with the engineering application，a new equivalent calculation method is proposed，which is using a two-dimensional model to calculate the sheet pile cellular seawall with unequal main cell and arc cell toe-levels. The research can be used as a reference for the popularization and engineering application of this structure.

Abstract:The main traditional remedial measure against liquefaction is the compaction method，but it has a limited compaction effect for silty sand soil layer with high fines content. The measure based on drainage method is needed，however，there is no relevant assessment method providing in nation standard for reference. Based on the different assessment methods for drainage criterion against liquefaction from domestic and international researchers，we carry out the calculation for selected engineering and analyze the differences of methods. The results show that the equal strain method is simpler when comparing with the free strain model method，thus it is more convenient for engineering application. The computational excess pore pressure ratio based on the method without considering well resistance is only 10% to 24% than the method with considering well resistance. The computational excess pore pressure ratio from Wang Sigen’s method of equal strain model increases with depth，which is consistent with the site liquefaction survey. Further，the average and maximum value from Wang Sigen’s method is higher than Onoue’s and Wu Shiming’s methods.

Abstract:In the design of previous water transport projects，the settlement and creep of the soft ground are considered，and the creep settlement of the rockfill itself is ignored. When the rockfill structures such as breakwaters，causeways，and backfills at the back of quayside piers cannot be effectively compacted and the rockfill structure is thick，its long-term creep settlement may affect the function of the structure. Based on a dike and breakwater project in Pakistan，we apply the feedback analysis method and laboratory test method to calculate the creep variable of rockfill，and compare and analyze the observation data of settlement and calculation results. The results show that the feedback analysis method has strong applicability to the calculation of creep settlement of rockfill in water transportation projects，and it is in good agreement with the actual observations. It can provide references for similar projects.

Abstract:Based on a contrastive analysis of simulated load-settlement curve from high strain dynamic test and measured load-settlement curve from static load test，we can obtain the settlement characteristic of large-diameter steel pipe pile in weathered phyllite overlying calcareous sand. The analysis results show that when the pile penetrates through a thin layer of calcareous sand and goes deep enough in the highly weathered hard phyllite，the settlement under the applied load is mainly caused by compression of the pile and the residual settlement is small. Both the high strain dynamic test and static load test are difficult to mobilize the soil resistance sufficiently. On the contrary，the settlement of pile under the ultimate pile load is large and residual settlement is also large when the pile penetrates through deep calcareous sand and just bears in the highly weathered soft phyllite. Soil resistance can be given full play in both high strain and static load tests. According to the analysis results，the thickness of calcareous sand has little effect on the ultimate bearing capacity of steel test pipe pile which mainly depends on the embedded length of highly weathered phyllite and strength of bearing stratum.

Abstract:Based on the Daxiaodeng land formation and foundation treatment project，we carry out the field-test comparative study on ordinary dynamic ramming and high-speed hydraulic ramming technology and test the standard penetration number of soil layers before and after reinforcement. The results show that the two processes can meet the design requirements of no less than 15 strokes after the blown sand layer is strengthened，and the ultra-static pore water pressure value at 4～6 m at mid-shallow depths by the hydraulic static tamping is greater than that by ordinary dynamic ramming. However，the impact of ordinary dynamic compaction is greater than that of high-speed hydraulic compaction. The high-speed hydraulic tamping process can be applied to the consolidation of the filled sand of mid-shallow depths.

Abstract:For driven piles in the soft rock stratum，there is currently no accepted method to evaluate the side resistance. For the rock socketed steel pipe pile foundation of Panama Amador cruise terminal，nine groups of dynamic tests of pile foundation have been carried out，and the side resistance of pile has been obtained by wave equation analysis method. The distribution law of pile side resistance in stratum and the relationship between pile side resistance and uniaxial compressive strength in rock stratum has been studied. The conclusions are as follows：1）The distribution curve of side resistance is in parabola form，and four strata can be distinguished obviously，which are soft clay，silty sand，strongly weathered rock，and moderately weathered rock. The part after the curve falls is defined as the rock socketed section. Based on this，the rock-socking depth of pile A-4 is 6 m，and the rock-socking depth of other piles is 4m，which meets the design minimum rock-socking depth of 3m. 2）The pile side resistance compressive strength （UCS） curve of rock stratum is exponential distribution，and non-linear distribution. 3）In the soft rock stratum，the side resistance plays a leading role. With the same UCS value，the pile side resistance in argillaceous siltstone is obviously larger than basalt. 4） With the increase of UCS，the self-stability of rock mass gradually enhances，and the friction coefficient gradually changes into the dominant factor affecting the side resistance. After UCS increases to a certain value，the pile side resistance tends to be stable. 5） The relationship between pile side resistance and compressive strength in the rock stratum is obtained，which can provide a basis for estimating pile side resistance in the rock stratum.

Abstract:For the dredging operation of the trailing suction hopper dredger，the suctioned clay is easy to accumulate inside the drag head and cause blockage，which can lead to the problem of the dredging efficiency reduction. We study the structure of the drag head to find that the grille to prevent debris from entering the dredging pump is the main location of clay plugging. Based on the Euler-Euler model，we carry out fluid dynamics numerical study to analyze the pressure and speed of the drag head and obtain the influence of different working parameters and grid angle on drag head pressure，velocity，and sediment concentration. The results show that the low-velocity area inside the drag head is prone to clay plugging，and the high-pressure water jet can increase the local velocity and promote the mixing of clay and water. Moving forward of grille can effectively prevent the drag siltation during the construction clay process，and improve the working efficiency of the trailing suction hopper dredger.

Abstract:Aiming at the problem that abnormal conditions such as the difficulty for foundation piles to be penetrated into the designed height and affect the construction under complex geological conditions，the drivability of foundation piles and the quality control methods of the pile sinking process are studied. Based on the reconstruction and expansion project of Dares Salaam Port in Tanzania，the method of conducting a comparative analysis of the GRLWEAP driveability and the whole-process PDA during the pile-sinking process of the pile foundation at the typical geological boreholes is adopted. And the conclusion is that the whole-process PDA results can be used to make more realistic corrections to the soil parameters in the driveability analysis. The research results show that the GRLWEAP driveability analysis after adjustment coucerning similar soil layer parameter correction values and the whole-process PDA can not only provide theoretical support for PHC piles sinking construction but also monitor the piles sinking process in real time for quality control.

Abstract:The evaluation of the underwater riprap effect for the riprap revetment project is the key and difficult point of the underwater quality control of the project. Accurately grasping and analyzing the underwater quality status of the project has played an important role in ensuring the construction quality of the riprap revetment project. GIS （geographic information system） technology has powerful spatial data processing and analysis capabilities，which can be used for multi-dimensional qualitative and quantitative analysis of the underwater riprap effect.The analysis results can accurately evaluate the construction quality and guide the next stage of construction，and reduce construction costs. By the analysis of the three test areas，we summarize the general construction rules：1） The upstream start in the project area and the deep water side of the downstream are prone to scour，and the riprap effect is poor. 2） The riprap effect of the middle in the project area and the near-shore area is better，but these areas are also prone to excessive construction.

Abstract:Due to the need to provide a larger working space in the pit of the ship lock near the water，the cement mixing pile is often used as the supporting structure. Steel sheet piles are mostly used as temporary water-retaining cofferdams outside the foundation pit. Taking the foundation pit of a ship lock as an example，we analyze the influence of temporary mixing cofferdams on steel sheet piles during the construction of cement mixing，and obtain the variation law of soil pore pressure during the construction of mixing piles through the field pore water pressure test，based on which a solution for excessive deformation of the cofferdam is proposed. According to the field pore water pressure test，we obtain the variation law of soil pore pressure in the depth and width of the mixing pile construction process and the influence range of the cement soil mixing pile construction on the surrounding，and propose a solution for the excessive deformation of steel sheet pile cofferdam. This study can provide a reference for the design and construction of similar foundation pits.

Abstract:Dredging in shallow water area has been a challenge for large trailing suction hopper dredger （TSHD）. Based on project conditions，this article explores the feasibility of dredging operation in shallow water where the water depth does not meet the designed minimum draught of the ship by pumping，bypassing，and opening the front mud door for loading in combination with a dredging integrated control system. Based on the case study of a dredging project in a port basin in eastern Africa，it is proved that this new dredging method can optimize the draught and improve dredging ability in the shallow water of large TSHD.

Abstract:The planning work in the early stage of the wharf’s driven pile construction includes the selection of driving equipment，establishing pile driving control standards and pile test，etc.，which is the key to the success of driven pile design and construction. The differences between Chinese and European standards will make Chinese engineers who are familiar with the domestic standards perplexed by the preparation work before the construction of driven piles under the European standard system. Starting from the standard，this article introduces the main planning work in the early stage of the pier’s driven pile construction under the European standard system，and through comparison with the relevant content of the Chinese standard，summarizes the similarities and differences between the Chinese and European standards to deepen the understanding of the European standard. In this way，the main work process in the early stage of driving pile construction under the European standard system is proposed and applied to a terminal project in East Africa. The engineering practice shows that the process is well-founded and comprehensive，and can meet the requirements of adopting European standard projects.