自平衡挡墙计算方法及斜桩稳定性研究

发布时间：2018-01-16 00:13

本文关键词：自平衡挡墙计算方法及斜桩稳定性研究　出处：《重庆大学》2016年硕士论文　论文类型：学位论文

【摘要】：边坡可分为天然斜坡和人工边坡,边坡失稳破坏一旦发生,常造成巨大的人员伤亡和经济损失。而近年来随着各类基础建设项目的实施,多遇到场地和地质条件复杂的边坡、基坑工程,有些传统的边坡支挡结构形式不能满足工程设计的要求,需要有新的边坡支挡结构形式,来解决一些场地和地质条件苛刻的边坡工程问题,并降低工程造价。本文所研究的自平衡挡墙是一种新型复合式支挡结构,在边坡支护中体现出良好的优越性。本文首先介绍了自平衡挡墙的研究现状和面临的问题,之后对自平衡挡墙嵌固面以下部分和嵌固面以上部分分别进行了总结和相关研究。分析了自平衡挡墙常用的结构形式和受力机理,完善了自平衡挡墙加预应力锚索的计算方法,并着重对嵌固面以下直桩、斜桩嵌固和桩前土稳定性问题进行了理论推导,使得自平衡挡墙有普遍的适用性和较广的适用范围。本文总结了水平荷载作用下桩体的内力求解方法,根据工程应用的需要,选取弹性地基反力法中常用的“m法”和“K法”分析自平衡挡墙的受力,并根据刚度矩阵编写了实用的计算程序,以此来指导实际工程设计。最后,利用FLAC~(3D)有限差分软件对斜桩嵌固问题进行数值模拟,采用模型库中的Mohr—Coulomb屈服准则,定义岩土体和桩体材料参数。通过建立接近实际工程的计算模型,对承受水平荷载的斜桩进行分析;改变斜桩的倾斜角度,提出了考虑斜桩桩前岩土体削弱时的地基反力系数的折减系数参考值。
[Abstract]:Slope can be divided into natural slope and artificial slope, once slope failure occurs, it often causes huge casualties and economic losses. But in recent years, with the implementation of various infrastructure projects. Often meet the complex site and geological conditions of the slope, foundation pit engineering, some of the traditional slope retaining structure can not meet the requirements of engineering design, need to have a new slope retaining structure. The self-balanced retaining wall studied in this paper is a new type of compound retaining structure. This paper first introduces the research status and problems of self-balanced retaining wall. After that, the following part of self-balanced retaining wall and the part above the fixed plane are summarized and related studies are carried out respectively, and the common structural form and force mechanism of self-balanced retaining wall are analyzed. The calculation method of self-balanced retaining wall and prestressed Anchorage cable is improved, and the theoretical derivation of the problems of vertical pile, inclined pile embedded and soil stability in front of pile is given. The self-balancing retaining wall has a general applicability and a wide range of application. This paper summarizes the method of calculating the internal force of pile under horizontal load, according to the need of engineering application. The "m method" and "K method", which are commonly used in the elastic foundation reaction method, are selected to analyze the force of the self-balanced retaining wall, and a practical calculation program is compiled according to the stiffness matrix to guide the practical engineering design. In this paper, the finite difference software (FLACX / 3D) is used to simulate the embedded problem of inclined piles, and the Mohr-Coulomb yield criterion in the model base is adopted. The material parameters of rock, soil and pile body are defined. The inclined pile subjected to horizontal load is analyzed by establishing a calculation model close to the actual engineering. By changing the inclined angle of the inclined pile, the reference value of the reduction coefficient of the foundation reaction coefficient considering the weakening of the rock and soil in front of the inclined pile is put forward.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TU473.1

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