地铁车站深基坑支护数值模拟与抗震分析

发布时间：2018-03-27 20:36

本文选题：地铁车站　切入点：基坑支护　出处：《安徽理工大学》2017年硕士论文

【摘要】：随着经济的发展以及交通的需求,地铁以其具有的优点逐渐成为主流。地铁的建设离不开基坑的开挖,基坑的开挖更是离不开基坑的支护,地铁的基坑支护涉及到岩土力学与工程各个方面,基坑的开挖可能会导致基坑周围土体变形等危害,对周围的环境造成重大的影响。因此,如何减少修建地铁时基坑的开挖对周边环境的影响是未来研究的重点。基于此,本文在查找资料、阅读文献的基础上,以合肥地铁4号线金寨路车站基坑支护工程为背景,提出了深基坑围护的设计方案,运用理正深基坑F-SPW软件和MidasGTS数值模拟软件对围护结构以及基坑的分步开挖进行了验算分析,并用时程分析法对车站建立模型分析。主要研究内容及成果如下:(1)介绍了基坑支护工程的研究背景、意义,对现行深基坑支护的特点以及存在的问题进行分析;(2)在阅读大量文献的基础上,分析了基坑变形的主要类型、基坑变形的影响因素以及基坑支护结构的土压力计算,并介绍了地铁车站的抗震设计的要求;(3)收集国内某地铁车站的工程及水文地质条件、周围环境条件等概况,确定车站的基坑开挖的方法以及围护结构的类型,并给出了该地铁车站标准段施工步骤;(4)运用理正深基坑F-SPW软件和MidasGTS数值模拟软件对深基坑的围护结构和基坑的分步开挖进行分析计算,分析计算结果均符合相关要求;(5)介绍了时程分析法,以金寨路车站为例,利用时程分析法建立模型,在不同的工况下,主要分析结构的位移最大值、层间位移、结构的内力最大值以及车站标准断面的内力及层间位移,数值模拟结果表明结构顶板与底板层间位移差及层间位移角、结构最大弯矩、最大轴力和最大剪力以及中柱最大轴压比均满足要求。因此,本文的研究具有重要的意义,可为类似地铁车站的基坑工程提供设计经验。
[Abstract]:With the development of economy and the demand of traffic, subway gradually becomes the mainstream with its advantages. The subway construction can not be separated from the excavation of foundation pit, and the excavation of foundation pit can not do without the support of foundation pit. The foundation pit support of subway is related to geotechnical mechanics and engineering. The excavation of foundation pit may lead to the deformation of soil around the foundation pit, which will have a great impact on the surrounding environment. How to reduce the influence of foundation pit excavation on the surrounding environment is the focus of future research. Based on this, this paper, on the basis of searching data and reading literature, takes the foundation pit support engineering of Jinzhai Road Station on Hefei Metro Line 4 as the background. In this paper, the design scheme of deep foundation pit enclosure is put forward. By using the F-SPW software and MidasGTS numerical simulation software of deep foundation pit, the structure and step excavation of deep foundation pit are checked and analyzed. The main research contents and results are as follows: 1) the research background and significance of foundation pit support engineering are introduced. On the basis of reading a large number of literatures, the main types of foundation pit deformation, the influencing factors of foundation pit deformation and the calculation of earth pressure of foundation pit supporting structure are analyzed. The paper also introduces the seismic design requirements of subway stations, such as collecting the engineering and hydrogeological conditions, surrounding environmental conditions of a subway station in China, and determining the excavation method of the foundation pit and the type of enclosure structure of the station. The construction steps of the standard section of the subway station are also given. The F-SPW software and MidasGTS numerical simulation software are used to analyze and calculate the retaining structure of the deep foundation pit and the step-by-step excavation of the deep foundation pit. The time history analysis method is introduced in this paper. Taking Jinzhai Road Station as an example, the model is established by using time history analysis method. Under different working conditions, the maximum displacement of the structure and the interstory displacement are mainly analyzed. The maximum internal force of the structure, the internal force of the station standard section and the interstory displacement. The numerical simulation results show that the displacement difference between the roof and the floor, the displacement angle between the floor and the floor, the maximum bending moment of the structure. The maximum axial force, the maximum shear force and the maximum axial compression ratio of the middle column meet the requirements. Therefore, the research in this paper is of great significance and can provide design experience for foundation pit engineering similar to subway station.
【学位授予单位】：安徽理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU753

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