复合地基船闸结构有限元分析

发布时间：2018-02-22 14:52

本文关键词： 船闸闸室复合地基数值模拟 ABAQUS　出处：《重庆交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：软土地基具有“三高三低”的特性,即高含水量、高孔隙比、高压缩性,低强度、低渗透性、低固结系数。为了克服软土地基的以上不足,工程中常采用复合地基法对软基进行加固。复合地基具有比天然地基更高的承载力、控制变形等特性,同时,又比桩基经济,因此在工程中得到越来越广泛的应用,并取得了很好的经济效益和社会效益。近年来,国内外学者对复合地基的工作机理、沉降变形以及承载特性等开展了大量的研究,取得了丰富的成果。但其理论研究仍然远远落后于工程实践,其作用机理及设计理论的研究尚处于发展之中,不够成熟。尤其在船闸工程领域,虽然复合地基已得到广泛应用,但在工程运用中大多是参考类似工程经验加以选择,关于复合地基与船闸结构的计算问题,是船闸设计中尚待解决的问题。本文基于ABAQUS有限元软件,结合清远水利枢纽二线船闸工程项目,将船闸结构、褥垫层、复合地基以及桩端下卧层土体四者视为一个相互作用的整体,建立了闸室结构-复合地基三维整体有限元模型,分析在不同工况下的闸室结构位移和应力特征,复合地基承载性状及其影响因素,从而得出一些对复合地基上船闸结构具有参考价值的结果,为该类型的结构设计提供参考。具体工作如下:(1)研究在完建、检修、低水位运行及高水位运行四种工况下,闸室结构的位移和应力特征,分析闸室结构在不同工况下的位移和应力规律。(2)研究在完建、检修、低水位运行及高水位运行四种工况下,复合地基的地基沉降、地基反力、桩顶位移、桩身应力、桩土荷载分担比、桩土应力比等力学性状。(3)采用单因素分析法,分别改变桩长、桩体模量、褥垫层压缩模量等影响因素,分析复合地基的承载性状和闸室结构的力学响应,通过对比分析,研究它们的影响规律。
[Abstract]:Soft soil foundation has the characteristics of "three high and three low", that is, high water content, high void ratio, high compressibility, low strength, low permeability and low coefficient of consolidation. In engineering, composite foundation is often used to reinforce soft foundation. Composite foundation has higher bearing capacity than natural foundation, controlling deformation and so on. At the same time, it is more and more widely used in engineering because it is more economical than pile foundation. In recent years, scholars at home and abroad have carried out a lot of research on the working mechanism, settlement and deformation of composite foundation, as well as bearing characteristics, etc. Many achievements have been made, but its theoretical research is still far behind the engineering practice, and the research on its mechanism and design theory is still in the process of development and not mature enough, especially in the field of ship lock engineering, although the composite foundation has been widely used. However, in engineering application, most of them are selected by reference to similar engineering experience. The calculation of composite foundation and lock structure is an unsolved problem in the design of ship lock. This paper is based on ABAQUS finite element software. Combined with the second line shiplock project of Qingyuan Water Conservancy Project, the shiplock structure, cushion layer, composite foundation and the soil under the pile end are regarded as an interactive whole, and a three-dimensional integral finite element model of the sluice chamber structure and composite foundation is established. The displacement and stress characteristics of gate chamber structure under different working conditions, bearing behavior of composite foundation and its influencing factors are analyzed, and some results of reference value for shiplock structure on composite foundation are obtained. The specific work is as follows: 1) to study the displacement and stress characteristics of the sluice chamber structure under four working conditions: finished construction, overhaul, low water level operation and high water level operation. This paper analyzes the displacement and stress law of gate chamber structure under different working conditions. (2) study on the settlement of foundation, reaction force of foundation, displacement of pile top, stress of pile body under four working conditions of construction, overhaul, operation of low water level and operation of high water level. Single factor analysis method is used to analyze the bearing behavior of composite foundation and the mechanical response of sluice chamber structure by changing the influence factors such as pile length, pile modulus, cushion compression modulus and so on, by means of single factor analysis, such as pile-soil load-sharing ratio, pile-soil stress ratio and pile-soil stress ratio. Through comparative analysis, the influence law of them is studied.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U641

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