格形地下连续墙围护结构的变形性状研究

发布时间：2018-04-03 18:23

本文选题：基坑　切入点：格形地下连续墙　出处：《华南理工大学》2015年硕士论文

【摘要】：近年来,随着地下空间开发力度的加大,许多新型的围护结构应运而生,格形地下连续墙就是其中发展较为迅速的一种。格形地下连续墙由于其独特的几何结构,整体刚度较大,可以较好地控制基坑的变形,而且其无需内支撑体系,也可以作为永久性结构来使用。但由于格形地下连续墙的结构形式较为复杂,其理论研究的进展远远滞后于工程实践的发展,结合格形地下连续墙的国内外相关研究现状以及存在的问题,本文研究的主要内容和成果如下:(1)总结了格形地下连续墙的特点及研究现状,提出了该种围护结构形式尚需解决的问题。(2)系统地介绍了有限单元法的基本原理和岩土体的本构模型,并在此基础上通过简单算例对本文所要使用的硬化土本构模型进行了系统的研究,归纳了硬化土参数选取的方案。(3)基于PLAXIS 3D有限元软件,建立了以格形地下连续墙为围护结构的准平面模型和简化三维模型,并系统地研究了格形地下连续墙的变形特性及其空间效应。(4)对以格形地下连续墙为围护结构的基坑进行了广泛的参数敏感性分析,较为全面地研究了连续墙的厚度、连续墙嵌固深度、隔墙的长度、隔墙的间距、基坑主动区加固、被动区加固和格墙间土加固对基坑变形特性的影响。(5)根据以格形地下连续墙为围护结构的某沉管隧道护岸工程为背景,重点分析了格形地下连续墙侧向变形的实测数据,并对比分析了有限元与实测数据之间的差异,验证了理论分析的合理性。
[Abstract]:In recent years, with the development of underground space, many new types of retaining structures emerge as the times require, and the lattice diaphragm wall is one of the more rapid development.Because of its unique geometric structure and large overall stiffness, the lattice diaphragm wall can control the deformation of foundation pit well, and it can be used as a permanent structure without the need of internal bracing system.However, due to the complexity of the structure form of the lattice underground continuous wall, the development of its theoretical research lags far behind the development of engineering practice. In combination with the domestic and foreign related research status and existing problems of the lattice underground continuous wall, the theoretical research progress of the lattice underground continuous wall is far behind the development of engineering practice.The main contents and results of this paper are as follows: 1) the characteristics and research status of lattice diaphragm wall are summarized.The basic principle of the finite element method and the constitutive model of rock and soil are introduced systematically.On the basis of this, the constitutive model of hardened soil used in this paper is systematically studied by a simple example, and the scheme of selecting parameters of hardened soil is summarized, which is based on PLAXIS 3D finite element software.A quasi plane model and a simplified 3D model with lattice diaphragm wall as retaining structure are established.The deformation characteristics of lattice diaphragm wall and its spatial effect are systematically studied. The sensitivity analysis of parameters for foundation pit with lattice diaphragm wall as retaining structure is carried out, and the thickness of diaphragm wall is studied comprehensively.The embedded depth of the continuous wall, the length of the partition wall, the spacing of the partition wall, the reinforcement of the active zone of the foundation pit,The influence of passive zone reinforcement and soil reinforcement between lattice walls on the deformation characteristics of foundation pit. Based on the background of a submersible tunnel bank revetment project with lattice diaphragm wall as the retaining structure, the measured data of lateral deformation of the lattice underground continuous wall are analyzed emphatically.The difference between the finite element and the measured data is compared and the rationality of the theoretical analysis is verified.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU473

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