Abstract:Based on the 12.5 m water depth navigation channel regulation project and the ecological features and environmental protection requirements in this river section, we explore techniques on ecological channel construction. A wide variety of ecological structures of waterway regulation was developed, and restoration engineering of artificial fish nest and ecological floating islands were also built to provide habitats for the aquatic organism. The impact of the suspended matters induced by the construction on water source sites in the tidal river was simulated and analyzed, and proper scenarios were proposed accordingly. The techniques of drive and induction of the Yangtze finless porpoise were studied based on the influence of noise, also the ecological and environmental protection measures for the overall process of construction were put forward together with the management methods. All the research results have been applied to the navigation channel regulation project in the Yangtze River below Nanjing and distinguish ecological effects have been achieved, and no environmental accidents happened.

Abstract:In view of the multiple reaches,complex environments as well as intensive ecological sensitive areas and high social sensitivity in the second phase of the Yangtze River 12.5 m deepwater channel project below Nanjing,we analyze the possible influence of the project on the surrounding environment and clarify the main environmental problems.Through establishing the environmental protection work management organization and formulating the management principle of the environmental protection work,we carry out the whole process environmental protection management.The practice shows that remarkable progresses are achieved in the environmental protection work and the harmonious unification of project construction and ecological development is realized.

Abstract:In view of the variety of aquatic organisms in the 12.5 m deepwater channel in the Yangtze River below Nanjing,how to effectively control and alleviate the adverse effects on the environment during the construction of the channel project is a new subject in front of the builders of the deepwater channel.For this,in the second phase project of the 12.5 m deepwater channel in the Yangtze River below Nanjing,we research and development the new ecological structures of the renovation of the building,strengthen the site monitoring,implement the supervision system,set up the downtime and eco-compensation,which have gained useful practice and exploration,as well as achieved remarkable results in the environmental protection construction.It can provide reference for other projects.

Abstract:In this paper, we study the floating breakwater composed of two pontoons and different types of plates by the 2D model tests, discuss the influence of the horizontal plates and vertical plates on the wave attenuation performance, and analyze wave attenuation performance and mechanism of the floating breakwater composed of two pontoons and the horizontal plates. The results show that for the floating breakwater composed of two pontoons and the horizontal plates, the wave attenuation performance of the slotted horizontal plates is better as a whole, especially for conditions of relatively long wave periods. The wave transmission coefficients decrease significantly and the wave attenuation performance improves significantly with the increase of the depth of the horizontal plates under water. However, compared to the twin-pontoon floating breakwater without plates, the wave attenuation performance of the floating breakwater with the horizontal plates still doesn’ t improve significantly as a whole. Compared to the twin-pontoon floating breakwater without plates, the wave transmission coefficients of the new floating breakwater with the porous vertical plates decrease significantly, and the wave attenuation performance increase significantly. Compared to the twin-pontoon floating breakwater without plates, the wave reflection coefficients of the new floating breakwater with the porous vertical plates all decrease and the wave energy damping coefficients all increase. The main reason for the improvement of the wave attenuation performance of the new floating breakwater with the porous vertical plates is that the porous vertical plates between the two pontoons can enhance the wave energy damping significantly.

Abstract:For rock mound breakwater design, Van der Meer formula is widely used by international codes for amour rock stabilized mass calculation. For the notional permeability coefficient Pvalue in the formula, four standard configurations are defined based on differences on core, filter layer and amour layer, the notional coefficients are recommended to be P =0.1, P =0.4, P =0.5 and P =0.6.In engineering practice, mound breakwater is not accord with standard of any kind of situation, often characterized by two standard situation in the middle of the form, especially for structure which has an impermeable core with filter layer and geo-textile. This paper introduces Van deer Meer’s study for notional permeability coefficient and the study progress in recent years, and the research results are taken into engineering practice. It may provide some reference for overseas engineering design.

Abstract:Based on the jet-flow theory, we establish a new method for calculating trajectory and extension of liquid jet in air by inducing the entrainment assumption and momentum analysis method, which is called jet-momentum model. We validate the new model and compare it with field test cases from bow-spray, pipeline-blowing, and calculation results of certain existing models. The results show that the trajectory calculated by the jet-momentum model is equivalent to the existing models, and is basically consistent with the measured values; the calculated extension range is also in well agreement with the measured values, and the jet-momentum model has wider application scenarios than the existing models. According to the working characteristics of bow-spray and pipeline-blowing, values of the two important parameters in jet-momentum model, jet expansion coefficient and velocity coefficient of inhaled air are recommended.

Abstract:For the improvement of problematic soil of soft marine deposit, in Hong Kong airport project, we carry out the experiment of laboratory mixing and site trial for marine deposit improved by deep cement mixing(DCM)with wet method for the first time. From testing results, we research the important influence factors, including soil properties, cement dosage, curing age, etc., on the unconfined compression strength(UCS)of laboratory and in-situ cement-soil mixtures, and find that the UCS of mixtures increases evidently with increasing of binder dosage and curing age, and obtains the correlation between mixture UCS and curing age. The research results provide good engineering reference for further application of DCM method used for soft ground improvement in Hong Kong.

Abstract:Aiming at the problems about that much concrete of old wharfs need to be repaired, and the repair performance of ordinary mortar need to be heightened, we prepare and test the repairing mortar addition of the PAE and silica fume for hydraulic concrete. The results show that mortar adding with PAE and silica fume displays higher bond strength，lower drying shrinkage, superior abrasion resistance and water impermeability compared with the control sample. These improvement is mainly attribute to bond action of PAE and pozzolanic effect and filling action of silica fume. Comparing with other repairing materials, mortar adding with PAE and silica fume shows excellent mechanical and durability and economy which is especially suitable to repair hydraulic concrete.

Abstract:To counter the problem of difficult digging and low production efficiency of hard cohesive soil in the dredging project, we carry out the cutting test of the original soil, for which the hard clay soil sample needs to be produced. In view of the characteristics of the hard clay, we develop a “vacuum+stack loading” technology for vacuum pumping at the bottom of the dredged silt with high moisture content and high compressibility. The experimental research shows that:1)The preparation device works well, the standard penetration number of clay soil produced is 13 hits, the liquidity index reaches 0.36,the dredging geotechnical engineering level is 4,and the properties are close to the sticky soil which is difficult for construction in dredging project, thus it provides qualified model soil quality for the hard clay cutting test.2)There is a good correlation for moisture content Wand unconfined compressive strength R ,standard penetration number N ,soil bearing capacity Fof preparation soil, the regression coefficients are all above 0.72.The results provide the basic technical support for the researches on the disposal of soft silt in the state of flow plastic.

Abstract:Based on small amplitude wave diffraction theory in two layer sea, the analytical solutions to the diffracted water wave potentials from a vertical arc-shaped porous breakwater are derived by applying eigenfunction expansion approach. According to the analytical solution, the wave loads caused by internal wave and surface wave and the distribution of maximum wave free surfaces are respectively evaluated. The results show that the appropriate hole arrangement on the surface of breakwater not only leads to an obvious reduction in surface wave and internal wave loads, but also causes changes of maximum wave distribution of diffracted water waves. The dimensionless maximum wave loads caused by internal wave may have same order of magnitude as that caused by surface wave，which implies that inner wave effects cannot be ignored. Furthermore, the relative variations of sea and water wave condition and breakwater geometry condition of breakwater have certain influence on wave diffraction, and there are some differences between surface wave and internal wave in the law of wave action.

Abstract:In order to meet the production and operation needs of Yangshan deep harbor, the departments concerned hope to retain a Kezhuashan-Jianggongzhu tidal channel, which is not consistent with the overall planning arrangement. Therefore, it is necessary to carry out the research on the adjustment of the shoreline function of the west port area of the Yangshan deep harbor. The channel of Kezhuashan side has a trend around cape flow characteristics ,and the Jianggongzhu side is promontory surrounded by features. Based on this understanding, we carry out a variety of shoreline test scheme.The test results show that the flow conditions in the channel and built port areas can be maintained and even improved after a proper optimization of the shoreline.From the point of view of tidal current, it is feasible to retain and develop the Kezhuashan-Jianggongzhu tidal channel, after reasonable coastline arrangement and appropriate engineering measures.

Abstract:The offshore large crude oil terminal project is generally located in the open sea with large waves and water depth,and the wharf is mostly butterfly.The pier foundation type is multiple selection and complicated,and the construction is difficult.Taking Yangpu 300,000 ton crude oil terminal and transportation facilities project in Hainan Province as an example,this paper introduces the structure selection of offshore large-scale crude oil terminal’s marine structure on cohesive soil.It also demonstrates the lifecycle proposal for the high-pile pier foundation and caisson pier foundation in aspects of structure design,durability design,construction technology,later maintenance and cost.

Abstract:The stability section of large dolosse armor of sloping breakwater under deepwater and swell action obtained by scale model test appeared damages during construction,which occurred again after the repair design and test verification.Based on a comprehensive analysis of the differences between the damages found on site and phenomenon observed on the model,we put forward problems in the third-time model test such as rod damages due to the rock shaking and rolling,and overall decline due to that small blocks support large ones.Increasing the block mass and through re-verification,we achieve the stability of the repair scheme.Moreover,the fact that shaking leads to the rod crack and breakwater damage is revealed.

Abstract:The quarry run quality is difficult to meet the requirements of the contract and technical specification because of the increase of fine content caused by high quarry run stock, so we strengthen the source control of the quarry run to meet the grading requirements. To minimize sieve quantity of quarry run on site, and ensure the construction progress of breakwater, we verify the section model test through setting the middle layer and adjusting the grading of the guarry run to provide a technical support for the breakwater engineering.

Abstract:Aiming at effect of perforated caisson on mean wave overtopping, based on the general wharf project of a certain port area in China, the paper analyzes and compares the empirical formula calculation method about mean wave overtopping of vertical and perforated caisson, and also makes a comparison between the empirical formula calculation results and physical section model test results .The results of empirical formula show that mean wave overtopping ratio of perforated caisson and vertical caisson is 25%～50%,and the results of physical section model test is 30%～82%.The study shows that perforated caisson could reduce mean wave overtopping effectively. And the results of empirical formula suggested by domestic scholars are even more similar to those of physical section model test.

Abstract:Automatic rail mounted gantry crane(ARMG)and automatic rubber-tyred gantry crane(ARTG)are the two main development directions of equipment in the automatic terminal yard. To tease systematically the technical problems of transformation from traditional terminals to automatic terminals and steer accurately the development direction of terminal automation, the renovation projects of ARMG and ARTG were carried out tentatively in part areas of two traditional container terminal yards in Shanghai Port. Based on the actual operating data of the renovation projects, the current situation and development trend of technology for the ARMG and ARTG are analyzed systematically and the adaptive conditions of the ARMG and ARTG modes to the port environment are studied. The result may serve as theoretical reference for the transformation of traditional container terminals to automated container terminals.

Abstract:Bank collapse occurs frequently in the middle and lower reaches of the Yangtze river, so revetments are arranged to protect slopes and prevent the bank from falling at this stage. To search an effective and economic layout of revetments in the regions where bank collapse occurs frequently，we use tests to analyze protecting results of different heights and different structures of revetments in ideal trapezoidal and straight river. The test shows that row bank revetments are more conducive to long-term stability if it is single arranged，but we should pay attention to the phenomenon of slope break point; revetments arranged in the upper regions of slopes get better effects in the limited time; with the width of revetments increased，effects are more obvious; from the effectiveness and economy, revetments arranged in the upper regions of slopes around 2 h 3 height are more reasonable.

Abstract:With the building-up of the upstream hydro-junctions, the coming water & sediment conditions and the riverbed of Yichang to Datong River reach changed greatly, and the navigation datum and lowest water level appeared different degree of deviation. So it is necessary to study the adaptability and adjustment of the navigation datum. Based on the real-measured data of the discharge and water level since the use of the current navigation datum, the article analyzes variation characteristics, reasons and trend for the lowest water level, and realizes that the navigation datum of Yichang to Zhicheng River reach adapts well, but that of Zhicheng to Datong River reach is poor. Based on these, the article discusses the train of thought on the adjustment of the navigation datum.

Abstract:The paper classifies the researches associated with the lock throughput capacity from domestic and foreign researchers, and summarizes the different topics. Those researches mainly include capacity calculation using the “unit-ship-type” method, lock-waiting time calculation based on queueing theory, research on lock service level evaluation method and criterion, simulation-based ship schedule in chamber, multi-lane locks schedule, and inland river system throughput capacity calculation, problem solving of complex system using optimizing algorithm. In the future, the main research orientation will be the general design theory and method for single-lane lock throughput capacity, and the method to calculate the throughput capacity of a specific multi-lane lock and multiple locks.

Abstract:With the continuous operation of the Three Gorges reservoir, the regulation of bed making in the lower reaches of the river has changed, and the river bed has been washed and silted. Based on the latest prototype observation data of the reach after construction of the Gorges project in 2003—2016,we analyze the changes about the channel bed. The results show that the water channel has the tendency of erosion and silting in low beach, which can have adverse effects on the boundary conditions of the channel itself. It is very likely to affect the inflow conditions of the Huguang waterway. On the basis of analysis, we make a forecast of the trend of waterway channel condition, and believe that the current favorable channel condition exists in the negative direction under the natural action. The results can provide reference for the channel regulation ideas and engineering design in the project.

Abstract:To meet the requirement of 6 m waterway from Wuhan to Anqing in the period of the 13th Five-Year Plan, we study the regulation measures for the 6 m deep waterway of Liyushan, Wu’an section under the restriction of multiple factors. Analyzing the current condition of the 6 m deep waterway, we clarify the problems of the waterway and probe into the shoal regulation idea and measures simply under technical factors. To counter the contradiction between the engineering measures simply under technical factors and watertight buildings, we propose the regulation measures for the 6 m deep waterway of Liyushan channel under multiple restrictions based on the model test.

Abstract:Using the static limit equilibrium method and finite element(FE)limit equilibrium method,we compute and compare the safety factors of the typical slope revetment design section,and research the influence factors on safety coefficient of slope stability,including the infiltration surface calculation method,water level difference and the load on top of the slope.The results show that the effective shear stress field calculated by the FE limit equilibrium method can intuitively reflect the existing area of the sliding arc,and the calculation result is relatively conservative;and the calculation of infiltration surface has a limited impact on the results of complex soils;due to the influence of pore water pressure,the calculation results of the static limit equilibrium method and the FE limit equilibrium method shows the opposite trend as the water level increases;with the increase of the load at the top of the slope,the results of the static limit equilibrium method and the FE limit equilibrium method have the same trend,while the results of the simplified Fellenius method are closer to the FE results.

Abstract:The amount of high mast lighting and other lighting facilities increases accordingly with the expansion of port yard area. A scientific method is necessary for the management and control of the high mast lighting. Combining the human-computer interface with the remote control system, we realize the wireless intelligent control for the high mast lighting. Arranging reasonable the amount of lightings and turning-on time, and through the intelligent dimmer, we achieved the favorable effect of high-efficiency, energy-saving and safe operation.

Abstract:According to the shortage of scene visual simulation in construction management of navigation power junction project, the concept of information modeling of navigation-power junction is put forward. Based on the technology GIS,3 ds Max and database, a method of navigation power junction project is built, which would make the total factors of navigation power junction virtual realized during the whole life cycle. The method of visualized dynamic information management is confirmed by visualized management system for Yilan navigation power junction, which is constructed on the basis of the engineering data and the technology of GIS.

Abstract:Large diameter cast-in-situ bored pile is widely used in high piled wharf,long distance approach trestle and some other port engineering projects.The calculation of vertical bearing capacity of large diameter cast-in-situ bored pile is not only related to the safety of the structure,but also related to project overall investment.After the comparative analysis of vertical bearing capacity design of large diameter cast-in-situ bored pile between Chinese and British codes,we try to seek rational optimization of pile length under the premise of safe and reliable of structure, finally recheck the vertical bearing capacity of pile through the static test results. The research results can provide a certain theoretical basis for the design of large diameter cast-in-situ bored pile in port engineering projects.

Abstract:Shallow plate loading test(PLT)is widely applied in civil engineering for evaluation of subsoil bearing capacity.Side load due to soil around loading plate may influence the judgment of subsoil bearing capacity.Based on limit equilibrium theory,we derive Terzaghi ultimate bearing capacity formula under a more generalized side load distribution condition.By adjusting magnitude and distribution of side load around loading plate in PLT,we analyze side load effect on ultimate subsoil bearing capacity respectively for sand and cohesive soil foundation.Combined with an engineering case,we point out that side load effect on determination of wether allowed subsoil bearing capacity should be judged on fully consideration of soil stress state reached in the process of PLT.

Abstract:In order to investigate the effect of cyclic loading waveforms on stiffness softening of structural soft soil,marine soft soil samples taken from Tianjin Harbor Bonded Area in Tianjin Binhai New Area will subject to cyclic loadings with varying waveforms and amplitudes.It is observed that the effects of varying loading waveforms like square wave,sinusoidal wave,and triangular wave do not have an apparent influence on the rate of stiffness softening when the loading amplitude is below the threshold stress.On the contrary,when the amplitude is much higher than the threshold,the rate of stiffness degradation for square wave is the fastest,and sinusoidal wave comes the second,while triangular wave is the last.Analyses are conducted on softening indices degradation curves under cyclic loadings with varying waveforms and amplitudes.Finally,the expression of softening index degradation considering both loading waveforms and stress amplitude is obtained.

Abstract:Pile foundation can effectively reduce the settlement of buildings and improve the safety of buildings,so pile foundation plays an important role in various buildings.Due to construction reasons,it may lead to pile defects,and the detection of pile defects is an indispensable part.According to the traditional hydrostatic load test,the displacement meter will change due to the damaged pile,which makes it difficult to accurately determine the location and shape of the defect.Other methods of detecting defects of the pile are expensive and cannot accurately determine the shape of the defect.Therefore,we propose VIC-3D digital speckle technique,a new defect detection method,to detect the position and shape of the defect.The digital speckle correlation method is a combination of modern speckle optics and digital image to measure the 3D deformation of the whole field of a defective pile.By analyzing the strain nephogram,the position and shape of the defect can be accurately determined.

Abstract:The key of soft foundation treatment for large oil tank is to control the settlement and differential settlement.However,the ordinary dynamic compaction replacement method has the problem that the replacement of the piers is in poor bottom condition and the settlement of the foundation after construction is large.Aiming at this problem,the improvement of ordinary dynamic compaction replacement method is studied.The preformed hole process can solve the problem of the poor bottom condition of the pier,so as to reduce the settlement amount of the foundation.The preformed hole dynamic compaction replacement method is a kind of construction technology which is used to deal with the weak soil foundation,which has the advantages of short construction period,low cost and green environmental protection.Through the preformed hole to guarantee the reliability of the replacement pier bottom,the settlement and differential settlement are successfully controlled.The actual test results and the water filling preloading test confirm the reliability of the treatment scheme.

Abstract:The ultimate deformation of pre-stressed high-strength concrete PHC pipe pile under monotonic load is an important parameter to judge the structural damage.In order to solve the effect of pile and soil parameters on the ultimate deformation of PHC pipe pile under monotonic load,we establish the finite element model of PHC pipe pile considering pile-soil interaction by the fiber beam element model of ABAQUS software and the common node method,and use the P-ysoil spring to simulate the pile-soil interaction.We apply UCONCRETE03 constitutive model and USTEEL02 constitutive mode,and analyze the influences of reinforcement ratio,buried depth,undrained shear strength of soil,and axial compression ratio on the ultimate deformation of PHC pipe pile.The results show that the ultimate displacement of PHC pipe pile increases with the reinforcement ratio increasing,and decreases with the depth,undrained shear strength of soil,and axial compression ratio increasing.

Abstract:The load transfer mechanism of super long deepwater bored pile is complicated,especially in complex geological environment,and its bearing performance has an important effect on the optimization design and construction of the pile.Based on the experimental data of self-balanced static load test,the load-bearing capacity of super-long deep water drilling single pile in different geostatistical tectonic-rock alternating strata is analyzed by finite element software GTS.Using Mohr-Coulomb model as constitutive relation of soil,and setting contact unit on the pile soil interface,the beam element is used to simulate the pile.The results show that the Q-S curve of the static load test is in good agreement with the calculated value,and the bearing capacity of the pile is good.The pile tip settlement begins to show a certain extent when the friction resistance of pile side is played.The axial force of pile and lateral friction of pile are obviously influenced by the change of depth,and show a certain rule.

Abstract:In view of the interfacial mechanical characteristics of steel reinforced concrete composite structure,we develop a steel casing concrete interface model with damage and slip effect.Based on the analysis of the force mechanism of reinforced concrete structure,we decompose the relative motion of steel cylinder and concrete on three dimensional scale,establish the three-dimensional constitutive relation of steel cylinder concrete interface model,choose the compressive strain of concrete as a quantitative index to characterize the damage degree of concrete,and put forward a quantitative calculation method to consider the influence of the coupling effect of local compression and slip on the load transfer performance of the interface.We carry out the compression performance test of the steel reinforced concrete composite component,and verify the applicability of the model by comparing the results of the test and the model results.

Abstract:Low-strain impact integrity testing is capable to detect the first defect down from the pile head.However,when multiple defects exist in a cast-in-place pile,other defects are likely to be covered by the first one due to signal superimposed effect and even the reflected signal of the first defect may also be affected.Based on several pile integrity testing cases in open pile wharves with low-strain impact integrity testing,we analyze characteristics of the reflected signal related to different multiple defects,probe into relevant detection methods,and propose detection and treatment methods including pile splicing,outer steel casing extraction,depth increase of steel casing,optimization of mud circulation method,as well as cutting away of the pile segment.

Abstract:Aimed at the problem of typhoon resistance of large non-self-propelled cutter suction dredgers,the hydrodynamic model of cutter suction dredger is established.The quasi-static analysis method and time-domain dynamic analysis method are used to calculate the maximum wave force tension and the maximum tension of mooring line under different operating conditions respectively.Comparing the results of the two methods,the mooring capacity of the cutter suction dredger is evaluated scientifically.The results show that both the quasi-static analysis method and the time-domain dynamic analysis method can be well used in the calculation of mooring capacity.The mooring equipment can meet the needs of mooring positioning and ensure the security under the 15th typhoon.

Abstract:For the problem of scour on the spur dike head,the scouing mechanism and the main influencing factors are discussed in this paper,based on the protection project of the spur dike in right bank of Jumuna River in Bangladesh.Based on the basic theory of river dynamics,this paper puts forward the measures to improve the protection of the spur dike head.Using the method of prototype observation,the effective protection research of the spur dike head is carried out,and the proposed method is effective.

Abstract:The large diameter and big slope(Slope 1  6)PHC pipe pile on land is designed to have pile foundation with high density.The construction accuracy of sinking pile is high and difficult.Aiming at these problems,the engineering piling test and static load experiment are carried out based on one dredged harbor basin project.In order to reduce the adverse effect of squeezing soil due to pile sinking on pile foundation,it is adopted the construction of first sinking the inclined pile and then the vertical pile as well as conducting pile driving from middle to both sides symmetrically.At the meanwhile,the construction measures avoiding bumping pile and difficult piling are taken.Results show that the construction scheme is feasible,pile driving effect is good,and the test results of pile foundation are Ⅰ type of pile.The construction scheme can provide the reference for the PHC pipe pile design and construction of similar projects.

Abstract:We study the main physical and mechanical properties of mud-hardened soils by a combination of laboratory experiments and field tests.We propose that the curing agent content and the gravity of the mud are the two major quality control points that affect the mud-filled filling bags.Through the analysis of the curing effect of different curing agents,the curing effect of L curing agent is obviously better than that of ordinary 32.5 cement and S1～S3 curing agent.According to the field test results and the design function requirements of the embankment,considering the aspects of economy and quality control,L curing agent theoretical content can be controlled at 7%.

Abstract:The PHC pipe pile has the advantages of high bearing capacity,fast construction speed and easy control of quality,and has been widely used in engineering practice.Some technical problems of pipe pile foundation gradually emerged,and one of the more prominent problems is the effect of the pile verticality on vertical load bearing capacity into soft soil area.This paper introduces a practical technology of verticality detection after pipe pile construction.The detection results of two engineering cases show that the inclination and displacement of the vertical deviation of the pipe pile are quite different,showing obvious randomness.On this basis,it is pointed out that the main reason for the tilting of pipe pile in soft soil area is improper control of pile construction operation,and the secondary reason is extrusion effect of heavy machinery driving after pile sinking and the extrusion effect of adjacent pipe pile.According to a lot of engineering practices,the influence factors of vertical deviation of pipe pile in soft soil are analyzed in detail,and some practical control measures are put forward.

Abstract:Based on the construction project of Hadarom port at Ashdod,Israel,aiming at the issue that according to the post-CPT test,some of the vibro-compaction points of foundation are not completely compacted without material filled.We comprehensively analyze the main reason of this issue based on the sampling of particle-size distribution test.Therefore,learning from the past vibro-compaction project experience of silty fine sand foundation without additional material filled,we carry out the optimization of construction equipment and method on site to guarentee construction quality that the foundation is completely compacted.In addition,it is suggested to use the laser particle-size analyzer to substitute sieve as a more reliable test method,as a reference for vibro-compaction construction in similar conditions.