王繁高速深层搅拌桩复合地基受力变形性状数值分析

发布时间：2018-02-21 06:12

本文关键词： 公路工程复合地基水泥搅拌桩数值分析　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：水泥搅拌桩作为一种常用的地基处理技术，其承载和沉降变形机理极为复杂。本文依托王繁高速公路项目，试验段高速公路从尾矿库区上游一定距离外穿过，由于受尾矿库边缘积水浸泡，地基为饱和黄土，工程地质不良，易引起沉降过大、不均匀沉降等问题，难以满足填土路堤安全和稳定性的要求，，现场采用水泥搅拌桩进行处理，为分析该段复合地基相关因素变化对其受力变形性状的影响，本文进行了工作如下：结合试验路段工程特点，采用有限元分析软件ADINA建立了群桩复合地基非线性有限元模型，分析在路堤荷载作用下，水泥搅拌桩复合地基加固区土体弹性模量、泊松比、粘聚力与内摩擦角，桩体弹性模量、泊松比、桩间距、桩长，及作为复合地基重要组成部分的垫层弹性模量、泊松比、内摩擦角及厚度对复合地基承载变形性状的影响，依据计算结果，对各计算参数对该复合地基的受力与变形性状进行了分析。此外，还进一步分析了路堤荷载作用下下卧层土体及路堤填土的弹性模量、泊松比、粘聚力与内摩擦角对复合地基受力变形性状的影响。论文结果为水泥搅拌桩复合地基的设计与施工提供了有力支撑。
[Abstract]:Cement mixing pile is a kind of common foundation treatment technology, its bearing capacity and settlement deformation mechanism is very complicated. This paper relies on the Wangfan Expressway project, the test section expressway passes from the tailings reservoir area from a certain distance outside, Because of soaking on the edge of tailings reservoir, saturated loess foundation and poor engineering geology, it is easy to cause excessive settlement and uneven settlement, so it is difficult to meet the requirements of safety and stability of fill embankment. In order to analyze the influence of the related factors on the deformation behavior of the composite foundation, the work of this paper is as follows:. The nonlinear finite element model of pile group composite foundation is established by using finite element analysis software ADINA. The elastic modulus and Poisson's ratio of soil in composite foundation reinforced by cement mixing pile under embankment load are analyzed. The effects of cohesion and internal friction angle, elastic modulus of pile body, Poisson's ratio, pile spacing, pile length, and cushion elastic modulus, Poisson's ratio, internal friction angle and thickness of composite foundation on bearing and deformation behavior of composite foundation are discussed. Based on the calculation results, the stress and deformation characteristics of the composite foundation are analyzed. In addition, the elastic modulus and Poisson's ratio of subgrade soil and embankment fill under embankment load are further analyzed. The effect of cohesive force and internal friction angle on the mechanical and deformation behavior of composite foundation is discussed. The results provide a strong support for the design and construction of cement mixing pile composite foundation.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U416.1

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