针对高强混凝土联锁块面层结构在港口堆场中的应用问题,对高强混凝土联锁块的特点、结构设计、施工工艺和经济效益等进行了分析讨论,认为高强混凝土联锁块在港区堆场应用中性能较优、经济效益明显,具有广阔的应用前景.

The Rock-Socketed Filling piles with Steel Tube (RSCFST pile) are now widely used as the foundations of wharf in mountain rivers in western China. The interaction between the steel tube and the cover soil on bed rock plays an important role in resisting the load for the piles. The soil-steel interaction is greatly influenced by the degree of saturation as the great variation of water level in the mountain river, which is significantly different from the piles in plain. In the study, a series of soil-steel interface shearing experiments are carried on with different degree of saturation and normal stress. The test results show that the shear stress-deformation curves can be fitted with hyperbola. And the relation between the ultimate shearing stress and the normal stress is linear. The failure property, the stress-deformation relation and the failure criterion of the interface are all greatly related with the degree of saturation. The relations between the degree of saturation and the shearing parameters are evaluated based on the tests data. Then a mathematical model is proposed to determine and assess the interface shear behavior considering the saturation of soil. The model is proved feasible and available based on the comparison between the calculated and measured data.

L-framed wharf is irregular in plan with uneven distributed mass and stiffness,and torsion effect shall be considered under the horizontal earthquake effects.Using the finite element analysis software SAP2000,and considering the horizontal earthquake induced response along two main axes direction and spindle oblique direction of the structure,this article analyzes the elastic response spectrum considering torsion-coupled effects of L-framed wharf in inland river.Based on the numerical calculation for the internal force response and displacement deformation of this arrangement wharf structure under seismic action,this paper makes the evaluation for the dynamic bearing behavior of the wharf structure,and finds out the structural weak position,serving as reference for the engineering structure design and optimization.

Taking an open-style high-pile frame wharf in the inland river in Chongqing as an example,this paper establishes the spatial steel frame model using MIDAS to extract the key mode to analyze the characteristics of the vibration shape.The research on the dynamic characteristics provides a basis for the structural design,vibration diagnosis and optimization design of structural dynamic characteristics.

Based on the multilevel gravity wharf of Chongqing Naxigou area,the vertical foundation stress and horizontal friction of the higher-level counterweight retaining-wall are regarded as the overload in the stability analysis of the wharf structure,and converted to the earth pressure on the lower-level retaining-wall.The reliability method is applied to find the influence of the width of higher-level platform on the stability of the lowerlevel wharf.As for the multilevel gravity wharf,the stability of lower-level platform is closely related to the ratio of the platform width(B)and wall height(H).The smaller B/H is,the greater the influence of the higher-level platform will be.Contrarily,the greater B/H is,the smaller the influence will be.The stability calculation of multilevel gravity wharf is analyzed on the basis of foundation stress,which will provide references for similar design.

Based on the case of Naxigou port in Three Gorge reservoir,taking advantages of the finitedynamic simulation method,we establish the collision model between ship and frame-pier wharf by non-linear analysis software ANSYS/LS-DYNA.In order to simulate the interaction among the ship,the frame-pier wharf and the rubber fender more accurately,we take the cushioning effect and energy absorption of rubber fender into consideration in this model.The influence of various factors are also analyzed.

Considering the whole process of the cushion from the excavation to backfilling,we constructed the optimization utility model for replacement sand cushion under consideration of code as constraint.According to this model,we analyzed the impact of different standard values of bearing capacity of sand cushion against the optimal results by an example.The example shows that compared with the trial algorithm design,the use of this optimization method can not only reduce the amount of sand cushion filling but also be able to directly derive the optimal pit excavation volume.

The checking of rock slope’s plane sliding includes the internal structure of rock mass surface checking and rock shear strength calculation.The sliding of homogeneous rock slope is due to insufficient shear strength.By assuming the relationship between the failure surface and the internal friction angle,we probe into the relationship between the failure angle and internal friction angle,and then propose the simplified estimation formula.Comparing the analytical solution with the numerical solution,we know that the simplified formula meets the engineering requirements,and the conclusion may serve as a reference for the practical engineering.

the integrated stability of structures is very important in the structural design,especially in higher reinforced retaining walls.This paper mainly introduces the reliability analysis of integrated reliability of earth retaining wall,based on treated the reinforcement as a gravity wall,to get the most dangerous sliding surface and center of the slope,and established the limit state equation,realized the Monte Carlo method programming with the Matlab.It shows the reliability analysis based on the overall stability of the reinforced earth structure has obvious theoretical significance and of great practical value.

在动床挟沙水流条件下,测量了不同流量及不同弯道情况下近底流速瞬时分布的情况,将时域信号通过傅里叶变换转化为频域信号,并运用数理统计的方法对近底流速频域内随机相位的分布进行了研究。结果表明:随机相位服从正态分布。

In the paper, scour mechanism and factors influencing the scour width of roadbed along river are analyzed. Through the method of theoretical analysis and experiment study, the formula of the maximum width depth of prevention wall in concave bank of G315 is put forward. The formulation of the maximum width depth is theoretics and technic bases of protecting water scour.

水毁是新疆315国道主要病害类型。根据现场调查，将新疆315国道公路水毁分为淘底塌滑、冲蚀啃边、冲刷截断3种类型；从自然因素、气候、河床地质条件和公路自身建设缺陷系统分析了新疆315国道茫崖一且末段公路水毁的形成环境；开发了适用于该段公路的格宾箱体结构和格栅笼两类新技术，前者适用于干沟及冲沟地段的水毁防治，后者适用于戈壁滩地段的水毁防治，并分别依托工程得到了应用，通过室内物理模型试验验证了其防治效果。试验结果表明，所提治理技术具有较强的实用性及经济优势。

In recent years,there have emerged many cases that the pier piles take out a larger deviation of the project due to the backfill for the slope.Combining with a wharf project in the Three Gorges Reservoir area,we analyze the interaction between the bank slope and piles of overhead ramp by the finite element method,discuss how the presence of pile foundation improves the slope stability and how the slope soil deformation impacts the pile foundation,contrast the pile's inner force and displacement in the pile head free and constrained by a continuous track beam,and reveal that the pile force can be improved and the displacement of pile head can be decreased in the latter case.Based on the engineering projects,we propose two measures to reduce the loads of bank slope pile foundation,which are proved to be effective and rational by the finite element analysis method,and which may serve as a reference for similar projects.

传统的高桩码头靠船构件多采用悬臂板式或悬臂梁式,这种构件能沿码头长度方向全面保护,但材料用量多,造价高,主要适用于水位差5米以下的地区。当水位差继续增大,这两种靠船构件就不适用了。本文综述了靠船桩式、多层固定系靠式(框架式)、浮式以及浮码头等几种适用于大水位差地区码头的靠船构件的结构型式,对这几种靠船构件的结构特点、功能原理、适用条件、优缺点等进行了对比和分析。

为减少环境影响和尽快恢复生态环境,某滨江路的护岸工程采用低桩承台+两级格栅加筋陡坡的复合式护岸新型结构。本文采用FLAC3D有限元差分方法,分析了复合格栅加筋岸坡的整体稳定性、低桩承台的受力和变形、格栅加筋岸坡体的受力和变位。并分别对岸坡加筋和不加筋作了对比分析。得出复合岸坡加筋后,桩台受力状况改善、变形显著减少,岸坡的变位也显著减小。计算分析结果为新型结构在工程中的应用提供了依据,也可为类似工程参考。

经大量研究,发现水是影响加筋土结构力学特性和破坏机理的重要因素.基于多孔介质的有效应力原理,依据流固耦合理论,建立了降雨条件下台阶式加筋土挡墙结构的流固耦合数值计算模型.应用有限差分软件FLAC3D,仿真模拟了墙体内的孔隙水压力、流速的分布和塑性区发展趋势等.结果表明,在强降雨条件下,由于墙体内孔隙水压力的变化导致土体的沉降;有效应力的改变影响了加筋土体的抗剪强度,从而导致墙体的整体稳定性大幅度下降.因此,在加筋土挡墙的设计及施工中,渗流场和应力场的耦合不容忽视.

According to the determining methods of the structural design partial coefficients, under two basic combinations of loads, the optimum action and resistance partial coefficients are obtained about the inner stability of reinforced earth structures based on the least square principle. They include permanent action partial coefficient = 1.2, heap load partial coefficient = 1.3, vehicle load partial coefficient = 1.4, reinforced materials resistance-breakage partial coefficient = 1.56, resistance-pulled out partial coefficient = 1.52, and the results show reasonable by engineering examples checking. The paper provides a reference to the new code based on probability critical state in reinforced earth structure design.

In one embankment construction in Chongqing Binjiang road,a new structure combining low pile cap with two step geogrid reinforced steep slope above has been proposed,in order to reduce the environmental impact,restore the environment and adapt to the new construction condition.The internal force and displacement of low pile cap,the deformation of the slope,and the tension(together with the distribution) of the geogrid are analyzed by the finite element method.Additionally,the slope stability is analyzed by the strength degradation FEM.The results show that the internal force and displacement of the low pile cap reduce 1/4 and 1/2 respectively,the slope settlement reduces 1/3,and the lateral displacement reduces 1/2.Obviously,the reinforcing effect is remarkable.The analysis provides valuable references for similar engineering.

本文针对目前码头平面设计方法的不足,采用有限元方法,对重庆市某内河架空直立式框架码头进行模拟,分析探讨了不同工况下码头的变形和各主要构件的力学性能。研究表明:此结构整体性很好,但工程设计偏于保守,可适当加大桩径、桩间距及排架间距,以减少工程投资,同时可以减小结构对水流的影响,为码头结构型式的优化设计提供了参考依据。