文档介绍：湖北工业大学
硕士学位论文
基坑土体主动区支护结构变形与土压力关系研究
姓名:陈泽世
申请学位级别:硕士
专业:岩土工程
指导教师:何世秀;庄心善
20100301
湖北工业大学硕士学位论文
摘要
本文主要探讨了考虑基坑土体主动区结构变形与土压力关系问题。通过对基
坑监测和数值模拟,计算和分析得出下列结论:
1、土压力在不同的工况下表现出不同的变化情况。首先是土压力变化曲线呈
现明显的非线性,由于受到支撑的作用,开挖侧主动土压力由减小变为增大。局
部土压力出现了波状递增的变化。
2、连续墙水平位移在不同工况下有不同的表现,受到支撑作用部分,以及开
挖深度比较小的部位,位移变化为中间小二头大。墙体位移随着开挖深度不断的
增加,没有设置支撑时,位移急剧变大。本工程最大位移出现在开挖面附近。
3、连续墙水平位移与土压力的关系呈现明显的非线性关系,但表现出不同的
非线性线形。连续墙水平位移与土压力部分表现出指数函数关系曲线,而部分表
现出正弦函数关系曲线,说明考虑连续墙水平位移与土压力的关系在一个工程中
应该针对不同的变形情况采用不同的函数关系分段进行土压力的计算。
4、模拟值与实测值总体变化曲线拟和情况较好;存在的差别表现为水平位移
模拟值大于实测值;土压力模拟值小于实测值。
5、工程实际中的基坑开挖设计,随开挖动态过程,基于连续墙水平位移与内
力的变化和相互关系的研究成果,为基坑开挖设计由应力控制转向应变控制找到
了一条途径,即当应力满足强度条件后,再由位移条件对连续墙变形进行控制,
使其符合变形要求。

关键词:基坑,土压力,监测,有限元,变形
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湖北工业大学硕士学位论文
Abstract
This paper discussed the relations of deformation and earth pressure on support
structure of foundation pits. By monitoring and numerical simulation of the actual
excavation, the following conclusions were reached:
1、The earth pressure at different operating conditions showed different changes.
First of all ,earth pressure curves showed clear non-linear, and active earth pressure of
lateral excavation es larger due to the supporting role. Local soil pressure
appeared in undulate incremental changes.
2、Continuous wall of horizontal displacement at different conditions have
different performance. Being part of a supportive role, as well as relatively small part of
the depth of excavation, displacement changes were big at both ends and small in the
middle. Wall displacement increased in the depth of excavation. When there was no
support, displacement dramatically was larger. The maximum displacement appeared in
the excavation works near the surface.
3、Horizontal displacement and earth pressure relations on continuous wall have
shown a clear non-linear relationship, but the performance of non-linear linear has been
different. Part of horizontal displacement and earth pressure on Continuous