软土地基深基坑监测与数值模拟分析

发布时间：2018-01-06 11:20

本文关键词：软土地基深基坑监测与数值模拟分析　出处：《中南大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文以长沙市潮宗御苑小区深基坑为工程背景,采用理论分析、现场监测和数值模拟相结合的方法,研究深基坑开挖引起的支护结构变形、周围地表沉降及周边建筑物沉降的变化规律,主要研究内容和成果如下： (1)介绍了深基坑的设计计算理论和方法,结合工程实际情况及相关规范要求,采用理正岩土软件对长沙市潮宗御苑小区深基坑进行了支护设计并制定了切实可行的基坑监测方案； (2)根据监测方案对该基坑进行了长期监测,监测结果表明,随着开挖深度增加,土体深层位移曲线由近似直线逐渐转变为“弓形”曲线,最大位移位置由地表向深度方向下移；周边建筑物沉降可分为缓慢增长、迅速增加和逐渐稳定等三个阶段； (3)利用FLAC3D建立了深基坑的三维数值分析模型,并将数值模拟结果与与监测结果进行了对比分析,二者较吻合。并利用该模型,进一步研究了基坑阴阳角、地表及坑底的变形规律。 (4)建立了倒L形基坑的三维数值分析模型,研究了倒L形基坑的空间效应问题。结果表明,空间效应作用范围约为2-3倍基坑开挖深度。冠梁可以抑制坑角位移的发展,并增加空间效应作用范围。图107幅,表25个,参考文献110篇
[Abstract]:Taking the deep foundation pit of Chaozongyuyuan district in Changsha as the engineering background, the deformation of supporting structure caused by deep foundation pit excavation is studied by combining theoretical analysis, field monitoring and numerical simulation. The main research contents and results are as follows: This paper introduces the design and calculation theory and method of deep foundation pit, combined with the actual situation of the project and the requirements of relevant codes. The supporting design of deep foundation pit in Chaozongyuyuan district of Changsha city was carried out by using the software of Lizheng geotechnical soil and a feasible monitoring scheme of foundation pit was worked out. According to the monitoring scheme, the foundation pit has been monitored for a long time. The monitoring results show that with the increase of excavation depth, the deep displacement curve of soil gradually changes from approximate straight line to "bow" curve. The maximum displacement position moves down from the surface to the depth; The settlement of surrounding buildings can be divided into three stages: slow growth, rapid increase and gradual stabilization. 3) the three-dimensional numerical analysis model of deep foundation pit is established by using FLAC3D, and the numerical simulation results are compared with the monitoring results, which are in good agreement with each other. The deformation law of yin-yang angle, surface and pit bottom of foundation pit is further studied. (4) the three-dimensional numerical analysis model of inverted L-shaped foundation pit is established, and the spatial effect of inverted L-shaped foundation pit is studied. The action range of spatial effect is about 2-3 times of excavation depth. Crown beam can restrain the development of pit angular displacement and increase the effect range of spatial effect. 107 figure, 25 tables, 110 references
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753

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