Abstract:In view of the Shenzhen-Zhongshan channel west artificial island shape,the physical model test is used to verify the stability of armor block and overtopping rate of crest under the extreme waves.The results show that:the incident wave rapidly forms energy accumulation at the top of the concave island wall arc,and produces complex and unfavorable wave states such as wave energy release and vortex flow at the convex corner of the island end;the convex and concave islands weaken the engagement performance of ACCOPODE,which is influenced by many factors,resulting in the instability of the 5 t heavy design armor block,then by several times of optimization,the trunk section of the island wall is increased to 8 t,and the special section of the end corner needs to be increased to 14 t to be stable;the law of overtopping rate is that the section from the wave incidence to the end corner gradually increases.Comparing the test results with the calculation of the standard formula and the results of the 2D flume section test,it is found that the stability and overtopping rate under the influence of the island shaped are both large,especially in the special area where the end corner protrudes,so the designer should pay attention to it,and try to follow the relevant provisions of the standard,that is,the axis turns outward to ensure that the included angle is more than 150°.By this test,the necessity of 3D overall test in stability,overtopping rate and optimal design is verified again.

Abstract:Aiming at the problem of wave dissipation performance of a new type of permeable breakwater of double porous inclined baffle,we study the influence of the baffle opening ratio and the baffle angle on the wave dissipation performance of the breakwater.Through the physical model test,we obtain the results of the reflection and transmittance coefficients,wave energy distribution and spectrum characteristics of wave amplitude behind the breakwater.The results show that the larger the opening rate of the inclined baffle is,the larger the transmittance coefficient of breakwater will be.Within the test range,the transmittance coefficients are all less than 0.5.This type of breakwater has better energy dissipation for waves,it is mainly reflecting for long period wave,it is mainly dissipating by wave-absorbing chambers for short period wave,and the overall transmittance coefficient for short period wave is slightly larger.In addition,the design of the inclined baffle of the breakwater has a smaller transmittance coefficient than the flat baffle,it has better wave dissipation performance,and the minimum transmittance coefficient is only 39% of the latter.

Abstract:For the problem of the wind load acting on structure,the current codes and calculation methods can accurately estimate the direct force of wind,but they may neglect the indirect force and make the estimation inadequate.Taking the two-dimensional typical floating structure as the research object,we apply the physical model test to analyze the wind load of constant wind and random wind of two different types of spectrum under hydrostatic condition.The results show that the action force produced by API spectrum random wind is greater than that generated by Davenport spectrum random wind.The average wind speed of different time intervals has great impact on the load of the floating body,so it should arouse the great attention of engineering designers.

Abstract:In order to improve the wave attenuation performance of a box-type free-surface breakwater,the bottom contour of the box is transformed from flat to symmetrical wavy by modifying the bottom contour of the box,so a kind of symmetrical wavy-bottom free-surface breakwater is proposed.The physical model tests are carried out for flat-bottom and symmetrical wavy-bottom respectively.During the tests procedures,the main bodies of the two breakwater models are fixed in the small wavemaker flume through the brackets,and the flume water depth are kept unchanged.A series of experiments are carried out through changing the box immersion depth,the wave steepness and the wavelength.The variation of transmission coefficient,reflection coefficient and energy dissipation coefficient with relative width B/L is given.By the performance comparison,it is found that the wave attenuation performance of symmetrical wavy bottom is better than that of flat bottom,and the increased quantity of wave attenuation effect is up to 60%;the reflection coefficients of the two models are almost the same,which indicates that changing bottom contour of the box has little effect on the reflection performance of the breakwater;the symmetrical wavy bottom dissipates more wave energy than the flat bottom.

Abstract:The study on the distribution characteristics of fish spawning habitat suitability is of great significance for river ecological protection.Taking the Zhongpanzi bend which is located in the upper reaches of the Yangtze River as an example and based on the 2-D numerical simulation data of planar water flow,we studied the distribution regularity of spawning habitat suitability of four major domestic fishes in the mountainous meandering river.The results show that the most suitable area for fish spawning will change with flow:when the flow is small,the most suitable area is in the deep groove;and with the increase of the flow,the area is mostly located in the side beach. Suitable area of micro-habitat SA increases first and then decreases with flow Q,and the peak value of SA appears near the annual average flow. The velocity suitability SV is relatively large on both sides of the river,while the deep suitability SD and the habitat suitability index SH are relatively large on the thalweg of the river.SD and SH on concave bank and convex bank are correlated,and SH increases linearly with SD.Under the multi-year average discharge,the distribution of SD along the river width is characterized by small at both ends and large in the middle.The distribution of SV and SH along the river width coincides with each other,and the numerical difference is mainly reflected in the vicinity of the two banks.The area of SH＞ 0.8 mainly concentrates on both banks of the river and concave shore beaches,which is more suitable for fish spawning.The research results can provide scientific reference for the protection of fish resources and the construction of ecological waterway projects in mountainous rivers.

Abstract:Due to the diversity of ecological characteristics and the complexity of flow movement,it is difficult to estimate the flow resistance in vegetated channels and to calculate the flood control capacity of ecological channels.Based on the review of flow resistance coefficient test and research result,we summarize the existing research methods,research contents and corresponding conclusions of vegetated channels,analyze the influential factors of the calculation methods of the resistance coefficient,and propose the technical approaches of vegetated channels model test to be improved.The mechanism investigation of flow resistance induced by vegetation should be strengthened by observing the turbulence characteristics in the vegetated layer.The study on the relationship between ecological characteristics of vegetation and flow resistance should be strengthened according to the vegetation characteristics of random growth and population distribution.The calculation methods of flow resistance under the combined action of vegetation and riverbed should be further optimized.

Abstract:In order to study the bending performance of UHPC wet-joint in precast concrete structures,we carry out the static bending tests on seven UHPC wet-joint beams with different reinforcement ratios and one cast-in-place ordinary concrete beam,and compare and analyze the crack resistance,deformation performance and ultimate bearing capacity of test beams.The results show that both UHPC wet-joint beam and cast-in-situ beam undergo bending failures,and their failure modes are similar.The joints of UHPC wet-joint beam have poor performance in bonding performance between old and new concrete,and it is recommended to arrange short steel bar at the joint in order to increase the crack resistance of the joint surface.The ultimate bearing capacity of UHPC wet-joint beam is not weaker than that of cast-in-situ concrete beam.The increase of the reinforcement ratio at UHPC wet joint can improve the beam’s bending bearing capacity.

Abstract:In coastal protection breakwater engineering,vertical wall is constructed by hydraulic sliding panel technology,and rubble slope is formed underwater in front of the wall.This kind of composite breakwater has shown good safety and stability in engineering practice.Three types of breakwaters (vertical breakwater,rubble-mound breakwater and composite breakwater) are tested under different wave conditions,and the mechanism for the better stability of the composite breakwater comparing with other 2 type breakwaters is studied.The test result shows that the rubble slope reduces the wave pressure on the vertical wall and wave impact significantly;the vertical wall also prevents the rubble mound from moving behind the breakwater and avoids excessive damage of the rubble slope.The combination of them produces better stability comparing with the vertical dike or the rubble slope.

Abstract:In order to improve the utilization rate of the shoreline,we propose to arrange the excavated harbor basin due to the lack of shoreline resources in the middle and upper reaches of Qiantang mountainous rivers.In view of the problems of large discharge,fast velocity and poor navigation flow conditions at the entrance of the excavated harbor basin,we study its layout and navigation flow conditions by means of the physical model and ship model tests.The results show that the angle between the axis of the harbor basin and the flow direction should be as small as possible from the navigation aspect.Maximum back flow velocity for the safe navigation of ships into the harbor basin is about 0.4 m/s at the brake section of the harbor basin and 0.5 m/s at the entrance area.The transverse velocity at the entrance area should be less than 0.8 m/s.

Abstract:In the finite element calculation of high pile wharf,a structural section is usually selected for analysis and calculation,and the force transfer effect of jagged joints between structural sections is ignored,resulting in conservative calculation results,which is not conducive to the competition with international consulting and design companies in the current environment.Therefore,based on SAP2000 finite element calculation software,the horizontal linear spring element is introduced into the calculation model to simulate the horizontal constraint effect of the jagged joints,and the overall model is established to analyze and verify the effectiveness of the spring element.Finally,the curve of the horizontal linear spring stiffness changing with the increase of the number of structural sections is given,which provides a reference for the calculation of high pile wharf.The results show that the calculation errors of the internal forces of the horizontal linear spring element and the actual jagged joints are within a reasonable range,which verifies the effectiveness of the method.The equivalent lateral elasticity is introduced into the structural design calculation of high pile wharf,so an optimal design method of high pile structure is given.

Abstract:The port is a special engineering subject with performance requirements as the ultimate goal.The breakwater guarantees the safety and performance requirements of the port,and it plays an important role in the general layout of the port.Based on the port project of a power plant in Pakistan,we determine the performance requirements of the port area by the coal-fired recharge and consumption model of the power plant under the conditions of the mid-long period wave surge,use the numerical simulation analysis to establish the relationship among wave height,period and ship motion,apply it as an important standard for the protection effect of the island-type breakwater,and determine the general layout scheme of island-type breakwater reasonably.The results show that the second scheme is the final design scheme,which can meet the requirements of annual operation time.

Abstract:Aiming at the problem of choosing the tide level range of loading and unloading operation on ro-ro wharf,we take the straight type ramp as a research object,and analyze the influence on loading and unloading tide level of factors including ramp technical parameters,ship condition,vehicle traveling capacity and wharf parameters,and quantitatively convert the influence to a system of inequalities with ramp working angle as the only unknow,solve the system of inequalities by a numerical iteratively method,forecast the suitable tide level range,and verify the forecasting process by an engineering example.The results show that the method is applicable to the prediction of tide level,and it can be used to guide ro-ro ship to make the loading and unloading plan.

Abstract:The permeable breakwater with baffle is a new structural type.It can conduct water exchange and protect the harbor at the same time,and the realization of these functions depends on the reasonable design of baffle’s depth.Based on the theoretical calculation,we carry out the comparative analysis of the results of engineering wave mathematical model and physical model,and obtain the influence of different water entry depth of wave baffle on the wave cover,wave height distribution and wave overtopping in the harbor.The results show that the increase of water entry depth of wave baffle outside the wharf decreases the wave height at the rear berths of the wharf,increases the horizontal force on wharf structure,increases wave overtopping,decreases operating days and enhances protection of the harbor.

Abstract:Tiaozhoumen anchorage is a large-scale anchorage directly serving the core port area of Ningbo Zhoushan Port.The proposed anchorage is located in the typical islands and reefs ports in China.The surrounding conditions of anchorage are complex and restricted by many factors,and it requires a large number of anchorage positions and different types of anchorages,so the anchorage layout is complex.This paper analyzes the service port of anchorage and its restrictive factors,and the location of anchorage is also demonstrated.Through the comprehensive calculation of anchorage types and numbers,we calculate the anchorage layout and anchorage capacity based on the layout of anchorage partition,and design the traffic organization of ships entering and leaving the anchorage.This paper gives a design method and solutions to key technical problems of large anchorage in complex islands and reefs waters,which can provide reference for similar projects.

Abstract:Using the field survey methods,we carry out a statistical analysis of the main diseases of gravity wharves along the coast of Guangxi region,which include cracks,damage of ancillary facilities of hydraulic structures,structural damage,irregular settlement and displacement,sand leakage,bed scouring,etc. Analyzing the relationship between the diseases and the berth tonnage and that between the diseasea and the operating time,and probing into the causes and hazards of the diseases,we put forward preventive and control measures.

Abstract:In view of the lack of theoretical basis for determining the layout parameters of the deep trench bottom protection belt,a large area semi-river normal model is used to study the influence on water level under different bottom protection parameters of the Qixingtai deep trench bottom protection belt,and the conclusion that the optimal plane spacing of the Qixingtai deep trench bottom protection belt is 300~330 m is obtained.The backwater law of strip-shaped bottom protection belt is put forward,which can provide the basis for the determination of similar deep trench bottom protection belt spacing.Through the research on the influence of the bottom protection belt on the traceability of water level decline,it is revealed that the bottom protection mainly aims to maintain the water level stability of the river section through two aspects：1） shaping the riverbed bulge to increase the riverbed shape resistance and affecting traceability transmission characteristics of water level decline；2） restraining the riverbed scouring and undercutting.

Abstract:The docking process is an important part in the whole process of ship lift operation.The fluctuation of water surface in the ship chamber during docking directly affects the safe docking of the ship and the working conditions of the synchronous shaft of the hydraulic ship lift.Aiming at the influence of the fluctuation characteristics of the water surface inside the ship chamber on the safe operation of the ship lift during this process,the 500 t class ship prototype test of opening and closing the horizontal door at different docking water levels and the ship entering and leaving the tank at different speeds is carried out.The effects of the docking water level and the speed of the ship entering and leaving the chamber on the characteristic of the water surface fluctuations in the tank are mainly discussed.The empirical formulas for the amplitude of the fluctuations in the ship chamber and the difference in water depth and water level are given to analyze its impact on the safety of tank and ships.The test results verify the navigation safety of the 500 t class ship of Jinghong ship lift.

Abstract:With the implementation of the two shoal regulation projects of Luochengzhou and Manyusha in the 12.5 m deep water channel below Nanjing of the Yangtze River,the external conditions of the Gaogang side beach have changed.The channel navigation conditions of Gaogang reach at the end of 10 years are predicted by means of riverbed evolution analysis and numerical simulation,and the evolution trend of Gaogang side beach and its influence on navigation in deep water are analyzed.The results show that:in the future,the river regime of Yangzhong reach will be basically stable,and the Gaogang side beach will not be silted up or washed away;the channel conditions of the upper middle section of the Gaogang reach can meet the navigation conditions of the deep-water channel,but there are slight navigation obstacles in the lower section of the Gaogang reach.

Abstract:To ensure the normal operation of Yangshan Deepwater Port,maintenance dredging has been carried out for the approach channel annually in recent years.Based on the bathymetric survey data during 2017—2019,the distribution of shallow area and siltation characteristics of the channel excavation section are analyzed.It is pointed out that the siltation of the channel in the normal wind days is characterized by the seasonal variation law of “basic balance of erosion and siltation and local erosion in spring and summer,and mainly deposition in autumn and winter”;the siltation of the channel in the typhoon days is relatively obvious,and the degree of siltation is mainly related to the wind force and the moving path of the typhoon.Based on the hydrological data,the reason of channel siltation is discussed,which provides technical support for the dredging construction of Yangshan approach channel in the future.

Abstract:Based on the field data,the characteristics of hydrodynamic and sediment along the 100,000 DWT deep water channel of Panjin Port are analyzed,and the sediment source of channel siltation and the possibility of sudden siltation are also discussed.The main research conclusions are shown as follows：1） The wave in this area is not strong,mainly wind wave;the tide is irregular semi-diurnal tide,which belongs to the middle strong tide area.The current is regular semi-diurnal tidal current,which mainly moves in the form of rectilinear current,and there is weak rotary current in the inner side of the entrance.2)The sediment concentration in estuarine area and near shore shoal is high,while that in open sea deep water area is low.The sediment mainly moves in the form of suspension.The sediment concentration in windy days is significantly higher than that in normal days.3)The distributions of sediment grain sizes along the channel are coarse and fine alternately;under the action of wave and current，the sediment incipience and transport in shoals on both sides of the channel are the main source and direct source of channel siltation;the siltation sediment in channel is relatively fine,which means that the siltation is mainly suspended sediment deposition;the possibility of sudden siltation is relatively small.

Abstract:In recent years,the navigation environment of Baoshan north channel in the south and north port branch of the Yangtze River estuary deteriorates due to the siltation of the sand head of Xinliu River.In order to find an effective solution,this paper applies geographic information system（GIS）to analyze the river regime change of this reach in recent 10 years,and studies the channel pattern adjustment scheme.The results show that the channel volume,thalweg plane and isobath of the water area change obviously,the sand bag of the Xinliu River shrinks,and the sand head of the Xinliu River gradually silts up and moves towards the channel direction.At present,the navigation environment can be improved by fine-tuning the channel pattern.

Abstract:In the waterway regulation project of Luyu section,the right channel of the Shenbeizui Shoal is dredged as the main channel with remarkable effect in the early stage of regulation.In view of the adaptability of the channel conditions after the large-scale ships in the upper reaches of the Yangtze River and the evolution of the Shenbeizui Shoal for more than ten years,the channel conditions of the Shenbeizui Shoal are analyzed and evaluated based on the evolution of the channel,the change of the shallow area,the diversion ratio,the velocity gradient,the adaptability to ship development and channel planning.According to the evaluation,there is siltation in the navigation channel.In view of the phenomenon of steep slope and rapid flow exist in each stage of water level,the maintenance measures that the discharge section should be enlarged and the elevation of some regulation buildings should be raised appropriately in special period are put forward.

Abstract:Based on the ship flow data of the 12.5 m deep water channel of the Yangtze River below Nanjing and the tide level data of various hydrological stations along the route,based on the theory of traffic flow,and combining with the hydrological analysis,we study the flow and flow characteristics of the 12.5 m deep water channel Yizheng,Dantuzhi,Kouanzhi,Fujiangsha,Nantong waterway.The results show that the big ships account for 73.2% in Yizheng channel’s ascending vessels,the big ships and the boats account for the same proportion in Kouanzhi channel,the big ships account for about 33% in Dantuzhi,Fujiangsha and Nantong waterwaysr.As for the descending vessels,the big ships account for 31.5%～41.3% in all the channels.The ship flow is greatly affected by tides during the spring tide,and the hourly flow of the ascending ships is positively correlated with the tide level.The descending ship is affected obviously by the ebb tide,and the relationship between the upper and lower ships and the tidal level process is unobvious during the small tide.The daily number of ships within a month is not directly related to the tides.The research results may serve as reference for the development of deep channel maintenance and navigation safety plans.

Abstract:In the waterway reconstruction engineering,it is often necessary to compare and select multiple schemes for the revetment structure because of the complex environment on both sides of the waterway.However,most of the comparison and selection are based on the subjective judgment of qualitative analysis,which often has some limitations.Taking the optimization of the revetment structure of the first section of a comprehensive regulation project of a waterway in Shanghai as an example,aiming at the typical section of revetment,this paper uses the grey relation analytic hierarchy process to seek a safe,reliable and economic reasonable revetment structure scheme.In view of the special section of revetment,the paper analyzes the special environmental conditions commonly encountered,and finds out the technically feasible and ideal revetment structure scheme.The results of this paper can be used in similar projects.

Abstract:Aiming at the waterway obstruction problem during the dry season of the Changzhou Water Conservancy Hub to the Jieshou River section of the Xijiang Shipping Trunk Line,we collect the hydrological and topographic map data in recent years to study the cause.The analysis of the hydrological characteristics and bed evolution of the engineering section reveals that the general decrease in water level and the change of channel erosion and siltation are the main reasons for the insufficient water depth of the channel during the dry season.The cross-flow of the curve also has an impact on the navigation safety of the ship.Engineering measures such as dredging and reefing,backfilling deep trenches,and smoothing the route are proposed.The study of the mathematical model of dimensional water flow shows that the water depth and flow pattern of the waterway have been improved after implementation of the channel regulation.The research ideas and results can provide reference for similar projects.

Abstract:In view of the characteristics of a river channel including the lack of flood control cross section width,the reservation for ship berthing function,thick silt layer foundation,and limited construction area,we adopt the double-row piles structure with hard cutting and interlocking based on the comparison.The engineering practice proves that the new structural type is applicable,because it is well adaptable to the soft soil foundation and constructed on limited construction land area without river breakage and large excavation.Meanwhile,it provides a guidance for similar projects.

Abstract:The downstream reach of Minjiang River is a natural channel,which has typical characteristics of mountain river.The waterway deteriorates seriously because of complicated obstacle property and sand excavation in the past years.Aiming at navigation obstructing problem of the shallow,sharp,curved and dangerous of Bawang rapids,we establish a two-dimensional water mathematical model,analyze the rapids characteristics and cause of formation,and determine the rational scheme through the comparison and optimization of multiple schemes considering the improvement degree of navigation flow condition,stability of channel and hydraulic parameter of rapids abating,and propose the regulation principle,concept and corresponding measures of similar mountain river rapids.The results show that the overall stability and trenching stability of the modified scheme 1-1 are better,and the work quantity is smaller than other schemes,so it is the recommended regulation scheme.

Abstract:For the problem of navigable flow condition of an expansion project of a ship lock in narrow reach in mountainous area,we apply a physical model with a scale of 1100 for the Mashi lock in Rongjiang River to investigate flow conditions of the low approach channel.The results show that using a guiding wall with bottom ports and optimizing the radius of curvature can improve the corresponding flow conditions significantly.We recommend that the length and radius of curvature of a guiding wall are 126 m and 500 m respectively,six ports and the width and minimum height of every port are13 m and 4 m respectively.The achievement can provide references for the similar projects.

Abstract:The erosion depth of river-crossing tunnel site section is directly related to the economics of project design and the safety of project operation,so reasonable prediction is of crucial importance.On the basis of studies of domestic and foreign scholars,we take the Yangtze River tunnel in Chongqing as a case study,analyze the riverbed evolution and the erosion changes of tunnel section according to the data of hydrologic conditions and the reservoir operation in the Three Gorges fluctuating back water area,and predict the erosion depth of the riverbed at river-crossing tunnel section under adverse hydrological conditions by some commonly used erosion calculation formulas.The results show that the predicted erosion depth of river-crossing tunnel site section is 4.8 m.The achievement can provide the references for the similar projects.

Abstract:In view of the fact that certain control measures should be taken when LNG ships enter and leave the port,which is obviously exclusive,appropriate LNG terminal size should be determined when laying out LNG terminals,so as to ensure the efficiency of navigation of all kinds of ships in the port area.Based on the multi-agent simulation of complex system modeling method,this study establishes different simulation scenarios with the case study of Liuheng port area in Ningbo Zhoushan Port,and through analysis of specific indicators for evaluation,the reasonable scale of LNG terminal on the south side of Liuheng port area is determined under certain navigation control measures,which can provide a basis for port layout decision and rational use of shoreline.

Abstract:The ways of building information model to realize information data sharing mainly include:using special intermediate file format and using public data model format.In view of the fact that DXF,a special intermediate file format,has lost information when transferring model attribute information,the terrain model is shared across platforms based on IFC,and the integrity of model attribute information is preserved.The results show that IFC,as an open international standard for data exchange and expression of building products,provides an idea for model information data sharing between BIM application systems.The research results have certain reference significance for surveying and mapping units to carry out BIM work.

Abstract:Waterway survey is an important work of waterway maintenance and management,and the indoor mapping of measurement data is the data basis of the electronic nautical chart,the digital waterway and other operations.Aiming at the problem that the traditional contour drawing and checking process consumes a lot of manpower and working hours in surveying and mapping,this paper uses IDW interpolation method and ArcGIS tools to design the contour generation method and optimization scheme,and then develops the contour generation platform.The practice shows that the new contour generation method has high productivity,and the contour generation platform can be extended and applied to waterway mapping.

Abstract:In order to solve the problem of high-precision installation of trapezoidal hollow components in deepwater channel regulation project,we study the development and application of measurement and positioning technology for the underwater installation of components to provide accurate orientation data for the underwater installation and meet the requirements of construction accuracy.Referring to the external structural dimensions of trapezoid hollow components and using the GPS and inclinometer equipment installed on the measuring frame to collect and calculate relevant positioning data of the components,we accomplish the fist-time adjustment of the components according to the measurement results.Then,by analyzing the component images acquired underwater,we calculate the gap width between components and adjust the components accurately for the second time according to the analysis results.The practical application shows that the plane and elevation measurement error of the system is not more than ±3 cm,and the measurement accuracy is high,which can meet the accuracy requirements of underwater installation.

Abstract:In view of sudden geological change during the ship lock construction,this paper carries out the analysis and in-depth study combining with the engineering example.This paper analyzes the solution mechanism,solves the shortage of foundation bearing capacity casued geological catastrophe by optimizing the superstructure and improving the foundation bearing capacity,determines the solution of shallow foundation replacement with empty box wall as the recommended solution through the comparison and analysis of multiple solutions,and calculates the load and displacement of the solution.The results show that the solution can adjust the gravity and center of gravity of the structure by adjusting the internal filler,and can flexibly adapt to a wide range of foundation conditions.

Abstract:With the development of information technology,the underwater deep cement mixing（DCM） pile construction ship has a perfect automation and information control system,which records a lot of data in the process of construction.At present,most of the analysis of cement soil’s influencing factors are based on the experiments in laboratory,or the design parameters and test results of the project (i.e.,the construction parameters are consistent with the design parameters).However,the actual construction conditions are not consistent with the laboratory conditions,and the actual construction parameters are also different from the design parameters.Based on the real-time data recorded in the construction process of the underwater DCM pile in the Hong Kong International Airport Third Runway Project and the statistical parameters of the tested piles during construction,and combining with the investigation and geotechnical test results,we establish the causal relationship between the investigation,construction and tests.Through the statistical analysis of the main factors that affect the quality of pile forming in different depth of different soil,we provide the basis for the actual construction parameter control.

Abstract:In view of the problem that the water depth at the end of the slope type launching chute in the traditional prefabrication yard is not sufficient to meet the launching and transportation of large caissons,the research on the launching technology of the caisson assisted by the large lifting force of the crane vessel is carried out.The method combining theoretical calculation with physical model test is adopted to carry out the relevant relations among the caisson lifting point setting,the large steel structure hanger system,correlation between the buoyancy supporting lifting force and the caisson draft and the fixed tilt height,etc.After detailed analysis,a new hoisting system for caissons transportation on the slope type launching way is put forward,which has been successfully applied to the supporting wharf project on the north bank of Dayaowan in Dalian Port,providing a mature and reliable solution for large draft caissons transportation on the existing slope type launching way prefabrication yard.