Abstract:For the problem of the active connected hook’s energy dissipation and beach protection effect,we analyze the beach height changes，changes of flow rate in casting test area and surrounding waters,near bottom turbulence intensity,sediment concentration,gradation change of sediment particles before and after being casted.The comparative analysis shows that the energy dissipation protection of active connected hook is better.The following conclusions are drawn:1)The active connected hook has reduced the flow strength in the casting area and has the overall effect of blocking water diversion.2)The activity intensity of coarse sediment near bottom is obviously weakened,and depositional environment changes to siltation.3)After the hydrological process of a dry season and the hydrological process of a flood season,the total deposition occurred in the casting area,with an average of 0.48 m.

Abstract:Two submerged breakwaters are intended to be built in the north branch of Hechangzhou waterway to improve the navigation conditions in the south branch.The proposed submerged breakwaters located in the deep channel of the river which makes the construction of the deep water zone difficult.In this paper,focused on a single upstream submerged breakwater,three different construction sequence plans “deep to shallow”,“shallow to deep” and “gradually raise” are studied，and the hydrodynamic conditions of each scheme changes at different stages of construction process are simulated and analyzed,based on a three-dimensional hydrodynamic numerical model.The results show that:On the premise that the construction difficulty has not been improved obviously in the construction area,especially the deep water area construction,“gradual raise” scheme has minimal impacts on the surroundings,especially the nearshore hydrodynamic environment during the construction process,which can be regarded as the recommended scheme.The results can provide reference for the quality control of construction such as riprap process.

Abstract:In view of the variety of wave form,we conduct two-dimension physical model experiments to study regular wave propagation over trapezoid submerged breakwater.We consider the effect of different wave elements (wave height,period and water depth)respectively to analysis the transformation of regular waves,and use wave height ratio as a relative parameter.The experiment results show that,the higher incident wave height,the smaller wave period and the smaller water depth leads to more obvious wave height attenuation with other conditions unchanged.Waves with enough water depth and smaller wave height propagate through submerged breakwater well;as wave height increasing,wave breaking happens on the top of submerged breakwater,and then wave height ratio decreases after it;for wave un-breaking and longer wave period cases,wave height ratio increases with two peak values on the top of structure.

Abstract:Lingdingyang is the horn shaped estuary in which the four east gates of Pearl River injected,with runoff-tide confluence and complex dynamic. From the aspects of tide level,velocity,flow and power pattern,the impacts of the Shenzhen-Zhongshan channel project on flow environment of Lingdingyang estuary are studied by mathematical modeling.Results show that:the impacts on the hydrodynamic environment of the west artificial island are the greatest,while the impacts of the anchorage and main piers take the second place,and there will be no great changes near the east artificial island and non-navigable bridge pier.Anymore,the variation of tide level and flow field in the vicinity of the island and the bridge is obvious.Overall,the Shenzhen-Zhongshan channel project has little impact on the overall pattern of the Lingdingyang estuary.

Abstract:MIKE 21 BW model is used for analysis of the risk of long period wave inside the harbor basin.The model building uses white noise spectrum and natural wave as incipient wave.Based on the white noise simulation result,harbor resonance periods are calculated using digital filter technology.Based on the natural wave simulation result,the wave time series at the berth is extracted.And the long period wave is filtered using threshold of 30 seconds.Taking a harbor at west Africa as an example,the long wave risk of harbor basin is discussed,and the result can be treated as reference for harbor layout design.

Abstract:Taking the crest wall of sloping structure as a research object,we study the wave load of crest wall under impulsive action of long-period wave by the physical model experiment,take the result of experiment to compare with the calculation results of Chinese design code and American coastal engineering manual (CEM),and adopt verification experiment to prove the obvious differences between them.The results show that China code and CEM have very close results but much smaller than that of test,with ratio of 1:5.Impulsive action of long-period wave on crest wall should be paid more attention in project design.Physical model test is indispensable for the reliability of structure,even if we can calculate by the code formulas.

Abstract:MIKE21 BW numerical model was verified by the wave filed simulation of port TEMA,which matched well with physical model test results.The wave conditions in the harbor under unidirectional and multi-directional irregular waves were studied and their variation laws caused by different wave directions and peak periods were given.The study shows that the diffraction performance of the multi-directional wave is greater than that of the unidirectional wave in the model with dominant diffraction,therefore it is safer and more rational to take multi-directional waves to conduct the simulation.Besides,it also finds out that the terrain plays a significant role in wave diffraction.What’s more,it is safer to take unidirectional waves to perform the simulation in the model with dominant reflection,with the higher disturbance coefficient under unidirectional waves than that under multi-directional waves.

Abstract:The impact of consolidation pressure,anisotropy and structures are studied on the permeability of silty clay respectively by using the sixth layer soil in Shanghai.Then the microstructure and permeation mechanism are discussed by using scanning electron microscopy.It is revealed that permeability coefficient decreases with the increase of consolidation pressure;and the horizontal permeability is greater than the vertical permeability;the permeability of remolded soil will decrease when compared with the undisturbed soil.Moreover,the microscopic analysis indicates that consolidation pressure makes the soil more compact;there are many granular polymers in the vertical direction while flaky or planar polymers dominate the horizontal direction.The soil is disturbed and the small particles are filled with large pores.The changes of pore types and contact modes between the granular clay particles are the essential reasons for the macro permeability difference of silty clay.

Abstract:Based on the hydrological sediment test and remote sensing image data,this paper analyzes the characteristics of sediment in the southwest of Hainan Island,calculates the amount of sediment in the sea by using different coastal sediment transport formulas,and studies the evolution of the beach by using the measured terrain data for many years.The results show that the tidal volume in the sea area is greater than that in the small tide,but the total suspended sediment content is low.The influence of the sediment transport in the study area is limited,but the influence of the coastal sediment transport is relatively large.The sediment transport capacity is in the range from 67.2 thousand m3to 133.1 thousand m3;the main driving force of the shore beach evolution is the wave,the change of coastline and tidal current caused by the interaction between the coastal flow and the tidal current led to the change of the coastline under the jurisdiction of the city,but the scouring and silting intensity is limited.

Abstract:Based on the measured data of hydrological sediment and water depth over multiple years in Oujiang River estuary and Wenzhou shoal,this paper studies the evolution characteristics of scouring and silting.The results show that the runoff in Oujiang River basin is characterized by the difference of annual and flood fluxes,which plays a crucial role in the erosion and deposition of the Oujiang riverbed.Muddy sand suspends again at the Oujiang River estuary and the Wenzhou shoal area due to the wind and wave actions,resulting in an increased sediment concentration.Oujiang estuary topography behaves a “flood season erosion and dry season sedimentation” features.Although the vertical and horizontal erosion and deposition of the riverbed changes frequently,the year-to-year changes of the bed erosion and sediment amplitude and river volume is little,and the riverbed is relatively stable.But Wenzhou shoal is in a state of continuous siltation.In particular,the construction of the recent reclamation project has further accelerated its deposition rate.Silting generally occurs at the shoals,and the sedimentation is most frequent near the southern end of the shoal and the northern section of the shoal near the Liten River dike.At the same time,since Wenzhou shoal near the south exit waterway blocked the tidal volume from the northern side due to the construction and completion of the Lingdi north dike,the tidal volume entering the shoal between the large and small islands increased,so it was in the state of erosion from1999 to 2010.

Abstract:Zhenhua Shipyard in Qidong city,formerly known as Daoda Shipyard,is established in 2007.Because the problem of capability matching between various functional modules in Zhenhua Shipyard has been highlighted,and some of the facilities are damaged to restrict the production capacity of shipyard seriously.Basing on layout planning of shipyard and analysis of technological process system,we set a scientific and rational planning target according to the enterprise development positioning and the potential of the key production factors and advance a plan that can match the production capacity of each area.The plan is suitable for large-scale,lean,standardized and safe development in the future,which will achieve the goal that rational layout of various functional modules,matching production capacity,smooth production technology and canonical production facilities through analyzing productivity calculation of production facilities as the theoretical foundation.This paper aims at the planning of production capacity upgrading in the existing port area,and adopts the planning method supported by quantitative calculation.Shipyards or other industrial plants facing similar problems can also consult or learn from it.

Abstract:The establishment of digital terrain is the foundation of realizing intelligent embankment.Based on the problems of difficulty and longevity in the establishment of digital terrain of intelligent embankment project,quick methods of achieving the digital terrain data based on the GE and obtaining the refined digital terrain data according to the 2D drawings based on the GIS are proposed.The quick access method of the DEM was established by TIN-modeling theory and visualization technology based on the GIS.Digital terrain with different precision was established by means of ArcGIS and 91 satpic assistant.Furthermore,based on the embankment engineering in the main stream Tangyuan area of the Songhua River,the digital terrain system was established,which proved the reliability and practicability of the method proposed in this paper.

Abstract:The paper carries out the static and dynamic analysis of the inclined pile-gravity structure under the action of berthing impact force by ABAQUS.By comparing the dynamic displacements with the static displacements of the inclined pile-gravity structure,the dynamic amplification factor of the impact force is get.The amplification effect changing rule of different effective impact energy is discussed.The results show that the dynamic amplification coefficients of the composite structures under the same effective impact energy are the same.In the design of inclined pile-gravity structure,when the ships effective impact energy is greater than 1 350.4 kJ,the coefficient of the berthing impact force is 1.5 according to the standard,which is small;when the design vessel type is 300 thousand DWT,it is recommended to take 2.12.

Abstract:Numerical analysis of the internal force of breast wall is performed to the problem of non-uniform settlement commonly existing in the concrete block quay wall.According to the static and contact analysis method of the finite element software ANSYS,we calculate the internal force of breast wall under the action of self-weight and operation loads.The analysis results show that the internal forces of breast wall increase significantly by the effect of non-uniform settlement.Therefore,some design and construction measures should be considered to reduce the effect of different settlement to the capping beam.

Abstract:The pile supported wharf structure with mudsill is widely applied in the regions on the upper and middle reaches of the Yangtze River in recent years.However,these regions are subjected to the earthquake disaster usually,and it is necessary to investigate the seismic performance of this new wharf structure for providing a reference for the seismic design.The paper presents a study on the effect of mudsill and seismic intensity on the natural vibration characteristics,displacement of decks and piles,moment and damage of piles through seismic response analysis using EI-Centro seismic wave.The analysis results indicate that the use of mudsill is beneficial to promote the structural stiffness and reduce the internal force of piles,resulting in improved seismic performance;with increasing of seismic intensity,the dynamic response of decks and piles is enhanced and thus the damage aggravates,the reduction extent of pile horizontal displacement due to use of mudsill increases and is related to the height of mud surface at piles,and the most adverse position of moment is also related to this height.

Abstract:The guild pile structure is an important anchorage form.The current code has not detailed the rules of wind load and wave load of marinas.In order to improve the calculation and analysis of the guild pile of marinas,we analyze the force of guild piles under wind load and wave load by ANSYS finite element software.We put forward reasonable suggestions on the calculation of the guild pile of marinas,and recommend that the integral model should be used in the calculation of marinas.The shielding effects of wind load should be considered such as ship type,the wind height of building,ship spacing,etc.

Abstract:In view of the crack problem after casting of breast wall in Abidjan Port expansion project,statistical analysis and intense research have been made,which show that the cracks always appear in the middle of the structure.The countermeasure of crack is explored by the internal temperature monitoring and shrinkage stress analysis of breast wall.It is found that the lower the temperature difference caused by hydration heat and concrete shrinkage is,the less cracks will appear.A series of experiments are carried out in the site and the ideal countermeasure of crack is found out,which is using the low hydration heat slag cement and better maintenance of poured concrete,and the cracks are effectively controlled by adopting these measures.This paper gives the developing regularity of temperature shrinkage cracks in the breast wall,and the ideal crack controlling method is found out.

Abstract:In view of the underwater detection problem of gravity wharf,we probe into the application of three-dimensional imaging sonar.We analyze the working principle and instruments,and study the station layout,parameter settings and data processing of three-dimensional imaging sonar in gravity wharf engineering.By point cloud image,we realize the qualitative detection of the underwater obstacle,caisson placing quality and caving,and quantitative detection of the component size,caisson fault and caisson clearance.Moreover,the underwater topographic maps are drawn.The article can provide reference for other under water enineering inspection.Applying this technology to the gravity wharf in the detection of underwater structure,it is implemented of the gravity wharf structure size measurement,underwater obstacle recognition,caisson placin quality testing and caving detection.

Abstract:Xiaonanhai beach land in Chetingqi waterway is the key navigation-obstructing channel due to its shallow,chaos and rapids flow.Based on recent investigation data，the flow-sediment property，variation of depth contour，thalweg and typical cross sections are studied.Results show that during recent decades,the plane form of Xiaonanhai beach land was steady,but local deep groove was significantly changed due to the remediation project.After the impoundment of the Three Gorges Reservoir,Xiaonanhai beach located at the fluctuating backwater area at the dry season.Since the small discharge at the dry season results in weak sediment-carrying capacity,and the upstream Xiangjiaba dam barriers a lot of sediment,siltation is unobvious,so its evolution is still induced mainly by remediation engineering measures.

Abstract:As a new type of hydraulic structure,the monolithic lock chamber structure with relieving platform has been used in Huihe Nanping lock chamber engineering.Using FEM numerical simulations,the influences of the height,width and thickness of the relieving platform on the horizontal displacement,soil pressure and bending moment distribution of the lock wall are analyzed.In the case of constant width and thickness of the relieving platform,with the increase of the relieving platform height,the horizontal displacement of the lock wall tends to decrease and then increase，and similar patterns can be applied for the width and thickness of the relieving platform.With the increase of the relieving platform height,the soil pressure of the lock wall above the relieving platform changed little,the soil pressure of the lock wall under the relieving platform tends to decrease and increase，and similar patterns can be applied for the width and thickness of the relieving platform.The upper part of the lock wall is the positive bending moment,and the lower part is the negative bending moment.The height,width and thickness of the original scheme are reasonable.

Abstract:The riprap revetment is widely used in the middle and lower reaches of the Yangtze River,which can enhance the flood resistance of the embankment,and can ensure the safety of flood control and control the favorable river potential.However,rubbles crept down frequently,which can lead to the damage of revetment.For the problem of water damage in riprap revetment,the actual destruction modes of riprap revetments and flume experiments about riprap damage were researched.It is believed that the water damage of smooth riprap revetment is mainly manifested as the loss,slide and slope deformation of the revetment rocks,which leads the surface soil of slope to be exposed.In this paper,three types of water damage modes are proposed and the corresponding damage mechanism is analyzed.

Abstract:The lower lock approach of Mashi lock extension project is located on the right bank of Rongjiang River and bent to main flow,flood thrust obliquely channel so that the navigation condition in the entrance area is very complex.We put forward three optimized layout schemes by these measures,such as planning the deviation of the route to the right bank,arranging the breakwater,increasing the diversion pier and rotating the axial angle of the diversion pier.Using numerical simulation of whole two-dimensional flow model of Mashi hydro-junction,we analyze and compare navigation flow condition in entrance area of every optimized layout schemes,and obtained the better scheme which can meet all navigation safety index.

Abstract:The Yanzishi-Jiawanen rapids locate at the dehydration section of the Longtan junction and the Pingban junction. Under the current condition the Yanzishi rapids are shallow in low water and steep in normal water level period,and Jiawanen rapids are steep in low water,which cannot meet the requirements of ship navigation. Based on the genetic analysis of rapids and characteristics of the navigation obstruction,the management idea of the rapids is determined.Through the study of multi-model optimization of physical model and ship model,a recommendation scheme is put forward：the scheme of the Yanzishi rapids is that the main and the branches are excavated simultaneously to adjust the distributary channel,smooth route and widen the channel.And the scheme of the Jiawanen rapids is that rocks in channel are exploded,which can expand bayonet section and broaden tranquil flow channel.The research result may serve as reference for the regulation of similar difficult rapids in mountain rivers.

Abstract:The development of the middle branch of Anqing waterway in the downstream of the Yangtze River has a great influence on the river regime and the stability of its left branch.Therefore,waterway regulation project was implemented to control the middle branch.Analyzing the causes of the middle branch’s formation and rapid development according to the observed hydrologic data during the project,and carrying out experimental study on the branch control scheme,we put forward the recommended scheme.The engineering effect analysis of the project indicates that by controlling the branch with the bottom protection structures,we can improve channel conditions.

Abstract:The development of the middle branch of Anqing waterway in the downstream of the Yangtze River has a great influence on the river regime and the stability of its left branch.Therefore,waterway regulation project was implemented to control the middle branch.Analyzing the causes of the middle branch’s formation and rapid development according to the observed hydrologic data during the project,and carrying out experimental study on the branch control scheme,we put forward the recommended scheme.The engineering effect analysis of the project indicates that by controlling the branch with the bottom protection structures,we can improve channel conditions.

Abstract:To ensure the safety of yacht berthing,better berthing stability of the yacht lock is required comparing with that of the traditional lock,so the design of the yacht lock’s filling and emptying system is essential.Based on the design of yacht in the project of riverbank public environment construction in Huishan district,and focusing on the influences of lock filling and emptying system on yacht berthing by establishing the 3D unsteady flow numerical model,we carry out the simulation calculation of water time,flow distribution of top branch hole and ship force and obtain the optimization measures for the transverse corridor shape,which improves the flow distribution of top branch hole and the flow pattern of the west lock,and leads to no obvious horizontal and vertical drop in the process of filling.It provides a theoretical support for the design of the yacht dock lock’s filling and emptying system.

Abstract:With the application of high strain dynamic pile test on large diameter super-long PHC piles of major project abroad,the pile defect types are concluded by comparing the PDA test results of the end of drive and restrike.The defects are found out at the pile head,pile body,the joint position and the bottom of pile etc.New proposals about the large diameter super-long PHC pile integrity judgment are put forward that the integrity coefficient of pile is not the only criterion.

Abstract:Aiming at several reinforcement methods with many hydraulic mud fill projects around coastal areas but different effects,we combine with a certain port engineering,and use four different reinforcement methods to reinforce hydraulic mud fill，such as no sand bed vacuum preloading method,no sand bed vacuum preloading method from shallow to deep(direct draining and secondary processing),sand bed vacuum preloading method,and sand bed vacuum-load consolidation.We use vane shear tests to analysis the reinforcement effect in depth direction,and obtain the conclusion that no sand bed vacuum preloading method from shallow to deep(direct draining and secondary processing)is better than others in economical efficiency and reinforcement effect aspects.

Abstract:There are no empirical parameters for soft rock geologic strata in Namibia oil tanker jetty.According to the in-site static tests and stress measurement results of one compression cast-in-situ pile and one compression-uplift pile,we analyze the mobilizations of skin friction and tip resistance in soft rock,and obtain the uplift coefficients of sand and silt at upper layers and the uplift ultimate bearing capacity of Q-s curves,which is characterized by slow variation.The test results show that,the relative displacement of pile and soil at upper layers is from 9 to 15 mm when the skin friction resistance of compressive pile gives fully play,and the ultimate value of unit skin friction resistance is from 30.1 to 48.1 kPa.The relative displacement of pile and soil is more than 40 mm when the skin friction resistance gives fully play in soft rock geologic strata.For the compressive process of two piles,under the maximum test load,the pile toe resistances are separately 22.3% and 27.3% of the pile head load.They act as friction piles because of small toe resistance.The ultimate bearing capacity of the uplift pile is 4 896.7 kN by using a hyperbolic model.

Abstract:To accurately determine the boundary and embedment length of the bearing stratum of DCM pile foundation,the determination method of bearing stratum is analyzed based on the empirical relationship between the CPTu data and the soil strength.Combined with the analysis of the characteristics of piezocone penetration test curve and the method of cumulative cone tip resistance,a preliminary evaluation method is proposed for selecting the boundary value of cone tip resistance,which has been well verified in DCM pile foundation project of large area and deep thick soft soil.

Abstract:Cone penetration test (CPT)has dual functions of site investigation and assessment,and is widely used in soil improvement.Taking the ground improvement of a LNGI project in the Middle East as an example,CPT technology is widely applied in different stages,such as investigation,design and construction.The paper analyses CPT application to soil layer classification,performance curve establishment,CPT-SPT relationship determination,quality controling of backfill and inspection of ground improvement.These ideas and scheme shall provide meaning reference for silimar project design and construction especially overseas projecte.

Abstract:The yard area of one project in East Africa is 1.15 million m2.The yard is filled with reclamation material dredging from basin and berth,and the design load of the yard is 30 kPa and 50 kPa.Under the suggestion of consultant engineer,boreholes have been arranged to carry out geological drilling.After the borehole drilling,the De Beer’s method is used to calculate the theoretical settlement,if the theoretical settlement is less than 10 cm,the ground treatment is not required.Some of the calculation theoretical settlements are especially close to the 10 cm critical value,thus if the contractor straightly judge no need for ground improvement,during the construction or when the yard is going to be used,the ground maybe appears serious settlement which can be a technology risk.Therefore the zone loading test is applied to recheck the value of settlement.The yard need no ground treatment according the ZLT test result and theory analysis.

Abstract:Based on the construction project of Hadarom Port at Ashdod,Israel,to solve the problem that many of cracks occurred in the typical construction of fascia beam of Quay TRS(Temporary Retaining Structure),we comprehensively review the construction method statement and temperature monitoring data for causes analysis of the cracks with a conclusion that the main reason for cracks is the constrain from bottom to upper layer of concrete.Therefore we apply one-layer casting as the solution together with ice shaving to control casting temperature,concrete mix design optimization,and concrete curing for cracks healing.It can provide a reference for future concrete structure construction of Quay 27 and the projects in similar conditions.

Abstract:The traditional hydraulic reclamation has the problems of unevenness and serious ponding.Combining with the example of dredger fill construction of hydraulic reclamation and term II tender I area A2 in polder area of Cangnan County,we determine the fill height by timely energetic calculation of fill elevation,and adopt inlet pipe technology,separate layer dredger fill,decentralize arrangement of gates and other effective methods to ensure acceptance elevation,blowing and filing degree and no ponding in dredger fill area of various fill branch.The measures can shorten emission distance,decrease cost,alleviate cofferdam safety pressure and ensure the fill quality.

Abstract:Aiming at the new layout form and the U-shaped groove track foundation of Yangshan phase IV automatic terminal storage yard,the twice construction technology of the track groove is put forward,and the structural safety of the track is analyzed by numerical simulation.The results show that under the design track load,the vertical stress at the interface of the track groove is within ±0.4 MPa,and the safety of the track structure can be ensured.The construction of the track’s twice construction widens the construction channel,improves the construction machinery’s efficiency significantly,and ensures the construction quality.Uneven settlement exists in track construction with a maximum cumulative settlement of 179 mm,and the settlement difference among different measuring points in the same track is up to 100 mm.The twice construction technique proposed solves the problem of both the construction channel of the automatic terminal yard and the settlement of the track foundation in the construction period.

Abstract:For the bottom concrete construction of the foundation structure of elevated pile cap,we use the steel sleeve box with the load-bearing characteristic as the concrete construction template,and adopt an integral load-bearing system process to realize the modular assembly and integral installation.The process can not only meet the stiffness requirement,but also be easy to install and disassemble to shorten the construction time.

Abstract:The steel tube for the bored pile is produced deformation by the factor of geology,like the part of the bored pile under the ground,especially the bottom of bored pile will produce deformation,which has a strong impact on the construction of bored piles.There are a lot of methods used in processing the deformation of steel tube,however,the flaws are obvious.Based on the existing common treatment technology,we carry out the technical research of distortion steel tube,successfully develop the method of using vibration reamer to revise steel tube,and obtain the national invention patent.This technology is capable of resolving the problem of deformation of steel tube quickly,which has a good application prospect.