Abstract:Overall stability of previous tetrahedron permeable framework in waterway regulation engineering is poor,and its bars are easy to take off the welding.Aiming at the deficiency,the research on the geometric shape,processing,construction technology of the new water permeable frame is carried out.The twisted double “H” permeable frame is invented and is used for the first time in the 12.5 m deep-water channel of the Yangtze River below Nanjing.The monitoring results show that its overall stability is good,and it can effectively reduce the velocity of flow and the effect of energy dissipation is obvious.

Abstract:For protecting the native plants in the roots of Luocheng shoal submerged dike and LL3～LL5 spur dikes,a new special-shaped gabion structure which is based on the standard gabion was created to replace the riprap dike.The special-shaped gabion structure can both satisfy the functional requirements of the project and the ecological-protection of the Luoceng shoal.And this research will provide a reference to the ecological structure design in regulation works for the navigation channel.

Abstract:The emergency plan plays an important role in improving rescue capabilities and reducing the loss during accidents.Based on the second phase of Nanjing 12.5 m deep channel project,we analyze the proposed emergency plan,which sums up the comprehensive emergency plans,emergency plans for specialized scenes,and on-site emergency plans,and extracts the corresponding event types and contents for each emergency plan.We also introduce the emergency organization and emergency procedure in the first responsibility system.

Abstract:Through a series of triaxial shear tests and soil cutting tests with prototype rake tooth in Huanghua port area,we probe into the shear dilation characteristic of the saturated dense silt and its influence on the cutting resistance of the rake tooth.The triaxial test results show that the saturated dense silt in Huanghua area exhibits significant strain softening during the shear process.The relationship between the peak stress and the confining pressure is nearly linear.In shearing process,the soil shows shear contraction and then dilatancy.With the increase of confining pressure,the properties of shear contraction are more and more obvious.The stress-strain curve should be divided into 4 different stages.The soil cutting tests with prototype rake tooth show that the cutting resistance of the saturated soil grows faster than that of the unsaturated soil.The maximum value of the cutting resistance of saturated soil is 2.7～3.3 times as that of unsaturated soil.For the saturated soil,the fluctuation range is larger than that of the unsaturated soil after the cutting resistance is stable.The test results show that the soil dilatancy effect on the cutting resistance of the rake tooth is very significant and appropriate measures for reducing the influence of dilatancy on the cutting resistance should be taken.

Abstract:In order to improve the simulation precision of storm surge,we superimpose typhoon wind field and NCDC background winds together and also consider the influence of astronomical tides on storm surge.By using the two dimensional hydrodynamic model MIKE21,the storm surge in Jiangsu sea area is simulated during No.1210 typhoon Damrey period.The influences on simulation results by applying different formulas of pressure flied and radius of maximum wind speed are discussed,and the best combination to analysis the flow flied is selected.The simulation results show that the storm surge caused by typhoon can be simulated well by this model,and the results of the combination of Holland’s pressure flied formula and Jiang Zhi-hui’s radius of maximum wind speed agree better with the measured value.

Abstract:Based on cnoidal wave diffraction theory,the wave potential solutions to shallow water wave diffraction by arc-shaped bottom-mounted breakwater are derived by applying the eigenfunction expansion approach,and accordingly the horizontal wave loads on breakwater are analytically calculated.The evaluating results demonstrate that the variation of incident wave angle,nonlinear influence parameter of wave,ocean condition,and breakwater structure geometry condition may have some influence on shallow water wave effects on breakwater.Compared with small amplitude wave theory,the results of maximum dimensionless wave forces from first order cnoidal wave theory are obviously larger than those predicted by small amplitude wave theory in certain shallow water condition and reflects wave nonlinear effects.

Abstract:Combined with the CCMP wind field and Holland gradient wind field,based on SWAN,numerical simulation was made for the East China Sea wave field during the period of typhoon Muifa to provide optimum spectrum boundary of the small scale.The satellite data were used to verify the simulation results,and the optimal maximum value of drag coefficient was discussed.The nested small scale numerical simulation in SWAN was conducted to study and analyze two kinds of reserving channel schemes after regional ocean utilization,which combined with the measured date of wave station.The results demonstrate that the significant wave height in west passageway is smaller compared to reserving east passageway,and the average decrease is 0.10 m and the maximum damping is 0.25 m from the feature points during typhoon period.

Abstract:A physical model test method is carried out to study the wave dissipation performance of the trapezoidal and rectangular combined submerged breakwaters.The attenuation effect of the single submerged breakwater and the combined ones is compared,and the effect of some factors such as the water depth on the breakwater,the wave height,the spacing and the number of submerged breakwater on the transmission coefficient Kt of submerged breakwaters are analyzed.The experimental results show that the transmission coefficient of the combination of submerged breakwaters increases with the water depth on the breakwater,and decreases with the increase of wave height.When the distance between the combined submerged breakwaters is close to half wave length,the wave dissipation effect is comparatively obvious.The more breakwaters submerged in the water,the better the attenuation effect achieved,and the number can be chosen according to the actual project.

Abstract:This paper discusses the impacts of bay mouth reclamation on the inland sea and channel from three aspects:tide,tidal flux and water change.Results show that the two projects have little influence on the inner bay.For Jin’gu River,reclamation narrows the channel width,decreases the flow velocity and diminishes the tidal flux by 17%.The half-exchange period is extended by 1.21 days.Lao-ren sand enclosure can strengthen the tidal volume of east channel but has little influence on Jin’gu River,because the narrowing of Jin’gu river may diminish the water diversion ratio.Though bay mouth reclamation partially takes up the middle channel,it has little influence on the inner bay,which means future reclamation planning can be considered the middle channel and beaches on its both sides.

Abstract:By using several methods such as pile shear method,elastic supported rigid beam method,etc.,we calculate,compare and analyze spatial characteristics and distribution coefficients of variable stiffness frame wharf under the action of horizontal loads.The result shows that pile shear method is more suitable to indicate spatial characteristics of the frame wharf.When the stiffness between different bents is approximately similar,the distribution coefficients calculated by using elastic supported rigid beam method is similar to the value in the code.On this basis,correlation among the stiffness value,the position of the huge stiffness bent and distribution coefficient is studied by changing the stiffness value and the position.Meanwhile,the spatial characteristics of the frame wharf and the effect of face slab on distribution coefficients are analyzed.

Abstract:Through wave section physical model experiment,the stability of the mattress of seawall with hinged concrete slab mattress revetment is studied under different conditions such as water depth,wave height,wave period,wave type and ballast block’s space.The characteristics of instability for different parts of mattress are revealed.The experiment results show that the stability of mattress is worse under the circumstance that wave height is higher or wave period is longer when the water depth is the same.The impact action of irregular wave on the stability of mattress is significantly more than action of regular wave.The instability of mattress occurs mainly in the edge of head and tail part,and the stability of internal part is better.The mattress still has good stability when it uses the structural type that the edge of head and tail ballast block with large thickness and the internal ballast block with small thickness.Ballast block’s space should be determined rationally with consideration of all factors in actual engineering because it will influence the stability and the ability of abrasion-resistance,deformation and beach protection of mattress and the selection of gravel cushion.

Abstract:Overtopping will occur under the combination action of wave and storm surge.Dike failure is caused by overtopping breakwater,and results overall instability of breakwater.To solve this problem,a series of physical model tests are conducted on stable thickness of concrete slab pavement on the inner slope of the seawall.According to the erosion of different slopes and different thicknesses of pavement damage,the relationship between stable thickness of concrete slab and average overtopping breakwater and landward slope is discussed.The results show that there is a linear correlation between stable thickness and overtopping breakwater with the same slope.Relative thickness becomes smaller with the slope becoming smaller.Equations are given for stable thickness of concrete pavement on the inner slope.

Abstract:The controversy existing in the recommended formula by Specifications for Environmental Impact Assessment of Port Engineering(JTS 105-1—2011)was discussed.The influences of different quantitative methods of the parameters on the wind erosion dust source intensity were evaluated with the data from an actual example.The calculations by the formula in Compiling Technique Guide for Dust Source Particulate Matter Emission List(trail)were employed as a standard to measure the accuracy of the quantitative methods of the dimensions.The results showed that:when calculating the wind erosion dust source intensity with the formula recommended by the specifications,compared with the results by the guide,the dimension of Q should be kga.When the height of stack was higher than 15 m,the wind speed should be adjusted with height of stack.However,the calculating results of dust quantity would increase.The erosion dust calculations of different dust control efficiency measurement were similar,which meant that the integrated shielding efficiency of windbreak net was feasible for the calculation of erosion dust source intensity.

Abstract:Combined channel characteristics of Jinhua River with existed wharf,three-dimensional numerical model of gravity wharf is established.Bearing capacity of piles foundation and stability for gravity wharf are studied by numerical simulation.The influence of impact force and mooring force on structure deformation is analyzed by calculating displacement curves of wharf slab and vertical displacement curves of piles foundation in different load conditions,respectively.

Abstract:Taking an oil terminal abroad as example,we analyze the movement and mooring forces of mooring ships by OPTIMOOR mooring software,especially the influences of the wave period,height and direction on the stability of mooring ships（movement and ropes force）.We adjust the layout condition and material of the ropes to reduce the surge.

Abstract:The paper gives the applications of double-row piles supporting structure in Xiabu port revetment engineering of Dongshanbu fishing port in Ruian.The double-row piles supporting structure can avoid the influence of foundation pit excavation on the surrounding buildings effectively.The main design parameters,such as pile length,distance,cohesion,internal friction angle and ground load are described.The stability of the structure is checked by using Lizheng deep foundation pit supporting calculation software,and the results indicate that all items satisfy the requirements of regulation.

Abstract:The sheet-pile wharf with separated relief platform is mainly composed of the front wall,the anchorage wall,the tie rod and the unloading platform system.The system bears the load from the wharf upper structure,which can reduce the front wall load and increase the excavation depth of the basin.Numerical simulation for the stacking process of this new type of wharf structure is the basis of the numerical simulation for the wharf.Numerical simulation by software FLAC3D is carried out to discuss the stress and deformation characteristics and the earth pressure distribution of sheet pile wharf with separated relief platform during excavation and stacking.Based on the comparison between results of prototype observation data and centrifugal model test,the rationality of the stacking simulation method proposed here is verified.

Abstract:The main lifting system is the key equipment in full balancing vertical ship lift.Taking shuikou fully balancing vertical ship lift as an example,we put forward the running speed curve of ship reception chamber,precise stop control method of ship reception chamber and lock heads backwater gate,and accident emergency protection principle and key parameters calculation method.The practicality of the speed curve is verified by the experiment of different speed.From the view of kinematics,the principle of accident emergency protection is analyzed,and calculation formula and method of key parameters are determined.We calculated brake delay time and slide stroke by multiple sets of ship reception chamber water depth datas,which were basically the same with field test data.The correctness of the principle is verified by theory and practice.

Abstract:To provide a basic support for the channel regulations of Zhoutian river in the middle reach of the Yangtze River,this paper researches the fluvial processes and navigation-obstructing characteristics.Based on the existing research result,this paper analyzes the real-measured data,studies the river evolution,waterway problems and navigation-obstructing characteristics,and predicts the trends of river evolution and channel conditions.According to the waterway regulation target,the general regulation idea is proposed.

Abstract:Based on the generalized model test,we measure the flow velocity around the root of the spur dike under the flow-deflecting reef and analyze the flow velocity value around the root of spur dike under different conditions,and obtain the velocity distribution pattern around the dike root under different flow volumes and different water depths.The analysis shows that under the influence reef,the flow velocity near the dike root is much higher than that of the normal reach,and the velocity of the cross section and profile near the dike root increases with the increasing flow and decreases with the increasing water depth.

Abstract:Longmen waterway is the key impeding navigation channel due to its shallow,chaos and rapids flow.Based on recent field investigation data,the flow-sediment property,variation of depth contour,thalweg and typical cross sections were studied,navigation obstruction was analyzed.Results show in 2007—2015,plane form of Longmen waterway was steady;shoal lines changed a little,river bed scoured and silt alternatively.Affected by upstream reservoir,decreased incoming sediment led to slight erosion in low channel.Large difference between flood and dry river width resulted in siltation in bend convex bank,in middle and low water flow,rapids flow appeared neighbouring Dahe spur dike,and chaos flow formed nearby the head of Longmen rock spur.

Abstract:When multi-level locks overhauling，we need to make filling or draining water process in advance.The current manual calculation takes time and energy,and unable to calculate the optimal solution.At the same time,manual calculation will be more inadequate when some parameters or conditions are changed impromptu.According to that,we design the automatic algorithm of filling or draining water process and the algorithm of process optimization,by which we develop the ancillary software of make filling or draining when overhauling.The algorithm is logically correct and reasonable,and has effective boundary conditions.The test results show that the algorithm can calculate the possible filling or draining water process,and also can optimize process.We can quickly correct processes by the software when conditions change impromptu.

Abstract:To counter the problem of influences of bridge construction on inland waterway navigation conditions,taking Wuhan Jianghan bridge construction for example and considering the bed evolution and channel variation of the engineering river section,we analyze the ship navigation restrictions for different design ship types and study the effect of different construction stages on the ship navigation,and put forward corresponding safety-guaranntee measures for the channel.

Abstract:Pile foundations in soft soil often suffer negative skin friction due to a bigger settlement of soil than piles,such as piles in standing pile wharfs,artificial islands and road foundations.Model experiments of single pile in soft soil under lateral surcharge load are conducted.Strain gauges and dials are located to measure the stress in pile and the settlement or horizontal displacement of pile top.Negative skin friction and bending moment along pile as well as their changing during consolidation are studied.The consequences are as below:the distance of lateral surcharge load has a great influence on the maximum bending moment and the maximum axial force of pile;negative skin friction and the effective stress coefficient keep increasing during the test and the rate slows down;pile with wings and pile away from the surcharge load both have higher neutral points,and in this test,they are 8.83% higher.

Abstract:We study the bearing mechanisms of the jacked pile during the pressing in sand with model test.To analyze stress changing laws of model pile while it is pressed into four different depths,we entirely measured the axial force,the displacement of model pile top,the strain of model pile top,and the circumferential strain and longitudinal strain of model pile.Using a semi-analytical and semi-numerical method,we deduced confining pressure and friction resistance according to circumferential strain and radial strain of model pile.The results show that:in the beginning of penetration,there will be negative friction in the upper part of model pile;as the penetration depth increases,the range and the values of negative friction in upper part are reduced until it disappears;pile skin friction is a smaller proportion in pile resistance,but its proportion increases with pressing depth increasing.Confining pressure increases with depth of penetration during the whole process.Confining pressure in the same depth of the soil is also increasing during the process of penetration.With the penetration depth increases,increasing trend of pile skin friction and confining pressure presents a better consistency,and the ratio between pile skin friction and confining pressure is from 0.41 to 0.53.

Abstract:With the large finite element software ANSYS,this paper establishes the single pile finite element model based on a 50 000 DWT high pile wharf.Calculation and analysis of the stress release at the damage and the influence of the damage on the horizontal bearing capacity in pile integrity detection in PHC pile are done.The results show that the stress release of PHC pile at the damage is obvious,the stress change at the damaged is significant,the rule of the stress change and the stress concentration factor are not related to the stress level of the pile.The pre-stress in PHC pile can improve the ability of cracking resistance of the damaged pile greatly.Stress concentration is significant at the damage,when the pre-stress level is higher,the stress change is greater at the damage.The most unfavorable section moves to platform damage.

Abstract:Based on the quasi-three-dimensional consolidation theory,the consolidation theory of sand drains under vacuum preloading was deduced according to special loading conditions and the spatial characters of the drainage board in the process of foundation consolidation.Gradient ratio test and the single well model test were conducted respectively in consideration of the drainage board clogging which had substantial influence and could not be ignored in practical programs,in combined with the experiment results,the consolidation theory of vertical sand drains considering clogging was then established.Comparison between the measured curve and theoretical curve concerning the variation of excess pore pressure indicated a good degree of agreement,and the theoretical formula can effectively reflect the impact of process of ground consolidation in different degree of clogging at different depth.The proposed amendment consolidated theory can be promoted to apply in the improvement of related soft ground using vacuum preloading method,and obtain relatively more appropriate theoretical calculations related to practice

Abstract:Taking soil slope as the research object and based on the indoor geo-technical experiment,we probe into the stability of soil slope in a soft stratuml under the effect of full stress using the finite element software,analyze the influence of soft stratuml on soil slope stress and the change rule of complete stress-strain process and stability of slope.The results show that:1)under the same strains condition,the principal stress difference increases with the increase of weak interbed’s thickness,which means that under the same stress condition,the specimen’s deformation degree increases with the increase of the intercalated thickness;2)the internal friction angle of the specimen decreases with the increase of the weak interbed’s thickness;3)the safety factor of the slope with soft stratum is less than that without soft stratum,which means that the stability of this situation is even worse,and the safety factor of soil slope decreasies with the increase of the weak interbed’s thickness;4)when the soft stratum and the slope appears a certain angle,the influence degree is the biggest,that of the vertical distribution is the second,and that of the parallel distribution is the smallest.

Abstract:Compression-springback property is a important reference on the foundation treatment and foundation pit engineering in the analysis of subsidence and deformation of backfill.As the sandstone particles material is a granular material,the prophase load and dry density influences its compression-springback characteristic on the condition of soaking;using the stress control trigeminy(high pressure)consolidation apparatus,the compression-springback characteristic is explored under the prophase load or the dry density after soaking 24 h.The results show that,at the same dry density,with the increase of prophase load,the compression properties of the sandstone particles material decrease gradually;under the condition of same unloading ratio,springback rate gradually decreased.At the same prophase load,with the increase of dry density,the compression-springback properties of the sandstone particles material decrease gradually.With the increase of prophase load and dry density,the plastic strain of the sandstone particles material decreases gradually.

Abstract:This paper use waste tires to waterway engineering seawall(embankment)construction,and through the finite element software ADINA on the interaction of water waves load and load conditions of tire reinforced high steep embankment and unreinforced embankment σ(stress)-ε(strain)state through the comparative analysis,the application of numerical simulation examples show that the tire reinforced soil(seawall embankment)not only σ(stress)-ε(strain)decreased significantly,and reached two times the use of waste tire,a practical method is simple and feasible.

Abstract:Underwater rubble mound foundation is widely applied in coastal engineering,and heavy hammer tamping is one of the main method for the rubble mound foundation.This paper aimed at that the tamping energy can’t be determined due to the influence of the water resistance during the construction of the dynamic compaction in water.Experimental study on the motion characteristics of the cone-like pounder is made by the method combining the theoretical calculation,model test and numerical simulation.The numerical computation method to determine the drag force coefficients is obtained,which provides the basis for calculating the tamping energy of different shapes of pounder.

Abstract:The groove sidewall instability is the biggest threat to the wall construction,especially in the trench excavation and reinforcement cage lifting process,the weight and construction vibration for the groove machines and its attached equipment are unfavorable to the tank wall stability.Taking the example of typical alluvial geological condition,we analyze the tank wall deformation and safety coefficient of the trench excavation process and the reinforcement cage hoisting process,and discuss the effectiveness of various measures from increase mud severe,jet grouting pile to reinforce the soil surface of airport and lowering of water-table basing on the strengthening method of reinforcing.Through the comparison and analysis,we put forward suggestions to choose of stability on the groove wall reinforcement effect in the actual engineering stability measures.

Abstract:When the leveling ship works to position,the uneven geological thin hard layer penetrating is the main factor to affect the safety.If the legs don’t locate in bearing stratum when the leveling ship ballasts,the puncture engineering accident might happen.Combined with the domestic and foreign relevant materials and the actual geological situation of Hong Kong-Zhuhai-Macau bridge construction site,the stability checking calculation and analysis research for the leveling ship’s legs penetrating the hard layer was carried out.The results reveal that leveling ship’s legs ballasting and penetrating through composite foundation,they may puncture the foundation.When the leveling ship’s legs penetrat into soft layer with thin hard layer,the stability coefficient should be calculated to reveal whether there will be a puncture.The pre-control measures had been put forward for leveling ship penetrating thin hard layers.

Abstract:Current construction management based on 2D construction drawings has disadvantages on duration calculation and real-time data processing.This paper presents a construction site management method based on 5D-BIM(5 dimensions-building information modeling),which provides an efficient tool of duration and cost control with highly efficient capability of data processing,friendly interface,rapid and accurate cost calculation,and 4D real-time display.

Abstract:The original large pipe pile joint precast technology has to use imported equipment and combined forming process.The complex equipment is not suitable for site construction.In order to simplify the construction equipment,reduce the construction cost and improve the engineering quality,we develop a new water absorption technology under the vacuum process,by which,qualified large pipe pile joint is produced by simple production process.