深基坑地下连续墙支护结构设计计算及数值模拟分析

发布时间：2018-01-07 20:44

本文关键词：深基坑地下连续墙支护结构设计计算及数值模拟分析　出处：《河北工程大学》2013年硕士论文　论文类型：学位论文

【摘要】：地下连续墙作为一种快速简便、可靠性高的基坑支护技术，已经越来越多的应用到了深基坑支护工程中。但是地下连续墙作为支护结构一般不单独使用，都会选择采用地下连续墙—内支撑或者地下连续墙—锚索等组合支护形式。目前对于地下连续墙—锚索支护结构的作用机理和性状的理论研究还远落后于工程实践。故本文采用FLAC~(3D)有限差分法，，针对地下连续墙和锚索构成的挡土支护技术进行研究。研究内容包括： (1)从土体本构关系、地下连续墙与锚索的模型以及它们与土体的接触面模型出发，运用FLAC~(3D)有限差分软件建立地下连续墙—锚索复合支护的二维有限元模型。 (2)以邯郸市某一深基坑工程为实例，对采用地下连续墙—锚索支护结构运用理正深基坑6.0设计软件进行设计计算，并用FLAC~(3D)有限差分软件模拟分析，得到两种软件计算下的基坑位移和受力情况等结果。通过分析，研究了基坑的水平位移、地面沉降、坑底隆起，及开挖工况对位移的影响。同时，将理正深基坑6.0设计软件的设计计算结果与数值模拟数据进行比较，得出了两者的差别。 (3)研究了施工附加荷载对基坑侧移和沉降的影响。 (4)对地下连续墙—锚索支护的作用机理进行了初步探讨。 FLAC~(3D)有限差分软件的模拟结果揭示出了地下连续墙—锚索支护体系的应力场和位移场在开挖过程中的变化情况。由于地下连续墙和锚索的共同作用，可有效地控制基坑变形、提高基坑的稳定性。实际工程的应用情况表明，地下连续墙—锚索支护结构能适用于地质环境复杂、对基坑变形要求严格的深基坑和边坡工程。本研究成果对进一步认识地下连续墙—锚索支护结构作用机理、指导其在实际工程中的应用具有一定的借鉴意义。
[Abstract]:As a fast, simple and reliable foundation pit supporting technology, underground continuous wall has been used more and more in deep foundation pit support engineering, but underground continuous wall as a supporting structure is generally not used alone. The combination of underground continuous wall and internal support or underground continuous wall and anchor cable will be adopted. At present, the theoretical study on the mechanism and behavior of underground continuous wall and anchor cable support structure is far behind the engineering practice. Therefore, this article uses FLACU (. 3D) finite difference method. This paper studies the retaining technology of underground continuous wall and anchor cable. The research contents include: 1) proceed from the constitutive relation of soil, the model of underground continuous wall and anchor cable, and the contact surface model between them and soil. The finite element model of underground continuous wall and anchor cable composite support is established by using FLACU 3D finite difference software. Taking a deep foundation pit project in Handan city as an example, the design calculation of underground continuous wall and anchor cable supporting structure is carried out by using the design software of Lizheng deep foundation pit 6.0. The results of foundation pit displacement and stress under two kinds of software are obtained by using finite difference software FLACU 3D. The horizontal displacement and ground subsidence of foundation pit are studied by analysis. At the same time, the design and calculation results of Lizheng deep foundation pit 6.0 design software are compared with the numerical simulation data, and the difference between them is obtained. The influence of additional load on the lateral displacement and settlement of foundation pit is studied. The mechanism of underground continuous wall-anchor support is discussed. FLACU 3D). The simulation results of finite difference software reveal the variation of stress field and displacement field in the excavation process of underground continuous wall and anchor cable support system due to the joint action of underground continuous wall and anchor cable. It can effectively control the deformation of foundation pit and improve the stability of foundation pit. The application of practical engineering shows that the underground continuous wall and anchor cable support structure can be used in complex geological environment. Deep foundation pit and slope engineering with strict requirements for foundation pit deformation. The research results have some reference significance for further understanding the action mechanism of underground continuous wall and anchor cable supporting structure and guiding its application in practical engineering.
【学位授予单位】：河北工程大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU473.2

【参考文献】