城市复杂地段深基坑内支撑支护数值模拟研究

发布时间：2018-03-14 11:27

  本文选题：深基坑　切入点：分步开挖　出处：《中国地质大学(北京)》2017年硕士论文　论文类型：学位论文

【摘要】：社会经济的飞速发展增加了都市规模,伴随而出现了相当数量的深大基坑,虽然基坑工程的发展和研究已经有了一段时间,但是要因地制宜的找出最合适的支护方案,有效的控制基坑所产生的位移变形与降低工程费用,仍然有很多工作要做。本文以深圳晟润丰国展项目基坑工程为例,借助于PLAXIS岩土分析软件,在二维的平面上通过数值模拟分析,对开挖支护的每个阶段进行分析。本文重点研究了基坑的稳定性、支护结构和地铁车站结构的变形,计算分析了每一种工况下支护结构的内力和变形,最后通过理正软件计算验证了基坑的稳定性,和PLAXIS模拟得到的结论相互论证,证明模拟得到数据的准确性。主要工作和结论如下:1、系统地分析了基坑支护结构的设计计算理论,从基坑支护的要求和设计原则到支护结构的设计方法、结构形式以及适用条件,分析了基坑支护的现状以及存在的相关问题。2、对有限元方法的原理进行了详细的概述,同时详细介绍了本文分析研究所采用的大型岩土工程有限元软件PLAXIS,就其两种典型的本构模型进行了简要分析,并且针对相关结构单元进行了概述。3、结合工程实例,通过运用有限元软件PLAXIS,考虑重点需要研究的紧邻地铁车站南边的基坑支护,在二维平面通过数值模拟研究得到相关数据,对开挖的每个阶段进行了分析,得到了每个开挖阶段的变形量和内力分布规律。最后和理正所得结论相互比较,证明建立模型的合理性。4、考虑了影响基坑稳定性的相关因素,包括支护桩刚度、支护桩埋深、支护桩的刚度、开挖宽度以及土体的参数等,论述不同取值条件下基坑的位移量,从而找出相对合理的参数,从不同的方面考察了支护结构的位移,同时也对其中相关要素进行了定性定量分析比较,这对于以后类似深基坑工程的工作开展提供了一定的经验。
[Abstract]:The rapid development of social economy has increased the scale of the city, accompanied by the emergence of a considerable number of deep and large foundation pit, although the foundation pit engineering development and research has been for some time, but to find out the most appropriate support plan according to local conditions. There is still a lot of work to be done to effectively control the displacement and deformation caused by the foundation pit and to reduce the project cost. This paper takes the Shenzhen Shengrun Fengguo project as an example and makes use of the PLAXIS software for geotechnical analysis. In this paper, the stability of foundation pit, the deformation of supporting structure and subway station structure are studied by numerical simulation analysis in two-dimensional plane. The internal force and deformation of supporting structure under each working condition are calculated and analyzed. Finally, the stability of foundation pit is verified by the calculation of straightening software, and the conclusion obtained by PLAXIS simulation is proved mutually. The main work and conclusion are as follows: 1. This paper systematically analyzes the design and calculation theory of foundation pit support structure, from the requirement and design principle of foundation pit support to the design method of supporting structure. The structure form and applicable conditions, the current situation of foundation pit support and the existing problems. 2. The principle of finite element method is summarized in detail. At the same time, the finite element software PLAXIS of large geotechnical engineering used in this paper is introduced in detail. Two typical constitutive models of PLAXIS are briefly analyzed. Through the use of finite element software PLAXIS, considering the key need to study the foundation pit support next to the south of subway station, the relevant data are obtained by numerical simulation in two-dimensional plane, and each stage of excavation is analyzed. The distribution law of deformation and internal force in each excavation stage is obtained. Finally, compared with the conclusion obtained by Li Zheng, the rationality of the model is proved. Finally, the relevant factors affecting the stability of foundation pit are considered, including the stiffness of supporting pile, the depth of supporting pile, and the stability of foundation pit. The stiffness, excavation width and soil parameters of the supporting pile are discussed. The displacement of the foundation pit under different values is discussed, and the relative reasonable parameters are found out. The displacement of the supporting structure is investigated from different aspects. At the same time, the qualitative and quantitative analysis of the relevant elements is also carried out, which provides some experience for the work of similar deep foundation pit engineering in the future.
【学位授予单位】：中国地质大学(北京)
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753
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本文编号：1611030