深基坑多种支护形式对邻近地铁隧道的影响分析

发布时间：2018-03-07 13:55

本文选题：基坑支护　切入点：深基坑开挖　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：随着城市化不断发展,城市的规模不断扩大,城市人口随之不断膨胀。与此同时,城市建筑的高密度、用地紧张、交通拥堵等问题不断凸显,城市交通拥堵问题成为城市发展中不可回避的研究课题,而地铁成为解决城市交通拥堵,缓解交通压力,推进城市化的首选。因此,合理进行城市地下空间的开发利用,通过地铁建设缓解大城市交通问题,是当前解决城市建设空间不足的优选之路。在邻近既有地铁隧道周围进行深基坑施工已经成为常态,在这种复杂的施工环境下,在确保基坑自身安全的同时,控制由于基坑施工引起的地层变形,保障邻近既有地铁隧道、建筑及管线的安全是值得研究的课题。本文结合昆明市某邻近地铁隧道的城中村重建改造项目基坑工程,研究基坑开挖对基坑本身、既有地铁隧道以及周边环境的影响。首先讨论了不同的基坑支护形式,然后确立了两种适用于本工程的不同支护方案。根据施工方案,采用基于有限单元法的岩土分析专用软件MIDAS GTS NX建立与支护方案相对应的施工全过程计算分析模型,对比分析了两种不同支护方案下基坑围护结构、坑底隆起以及邻近地铁隧道的变形规律。结合本文背景工程的特殊性针对北侧支护形式提出了两种不同的支护方案,其各有优劣。最后,将周边环境以及隧道变形的监测数据与数值计算的结果进行了对比分析,针对本工程对两种不同的基坑支护形式进行了评价。
[Abstract]:With the continuous development of urbanization, the scale of the city is expanding, and the population of the city is expanding. At the same time, the problems of high density of urban buildings, shortage of land use and traffic congestion have become increasingly prominent. Urban traffic congestion has become an unavoidable research topic in urban development, while subway has become the first choice to solve urban traffic congestion, relieve traffic pressure and promote urbanization. To alleviate the traffic problems in large cities through subway construction is the best way to solve the shortage of urban construction space at present. The construction of deep foundation pit around adjacent existing subway tunnels has become the norm, in this kind of complex construction environment, While ensuring the safety of the foundation pit itself, the formation deformation caused by the foundation pit construction is controlled, and the adjacent existing subway tunnels are protected. The safety of buildings and pipelines is a subject worth studying. In this paper, we study the excavation of the pit itself in connection with the project of reconstruction and reconstruction of the village in the city near a subway tunnel in Kunming. The influence of the existing subway tunnel and its surrounding environment is discussed. First, different supporting forms of foundation pit are discussed, then two different supporting schemes are established for this project. Based on finite element method, MIDAS GTS NX, a special software for geotechnical analysis, is used to establish the calculation and analysis model of the whole construction process corresponding to the supporting scheme. The foundation pit retaining structure under two different support schemes is compared and analyzed. According to the particularity of the background engineering of this paper, two different support schemes are put forward, each of which has its own merits and demerits. The monitoring data of surrounding environment and tunnel deformation are compared with the results of numerical calculation, and two different types of foundation pit support are evaluated for this project.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U231;U456.3;TU473.2

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