超深大基坑开挖对紧邻既有地铁隧道的影响分析

发布时间：2018-01-10 14:16

本文关键词：超深大基坑开挖对紧邻既有地铁隧道的影响分析　出处：《北京交通大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着中国城市化的进程,地铁及深基坑工程的修建越来越多。由于城市用地紧张,不可避免地导致基坑工程邻近地铁隧道这一新难题的出现。深基坑的开挖会对邻近既有隧道产生许多不利的影响。城市地铁隧道对变形与沉降要求严格,深基坑开挖施工技术是否得当,将直接影响邻近隧道的安全。本文以北京国家金融信息大厦深基坑工程为依托,利用Midas GTS软件模拟基坑开挖过程,研究深基坑开挖对紧邻既有隧道的影响。相关工作和成果如下： (1)阅读相关文献,了解国内外研究现状,为本文的研究分析提供借鉴与参考。 (2)介绍基坑变形估算理论,为数值模拟提供相应的理论支持。 (3)利用Midas GTS软件模拟不同开挖方法,研究其对隧道的影响。通过三维有限元模拟分析,发现盆式开挖比岛式开挖要合理,盆式开挖能有效控制隧道的位移与变形。模拟不同近接距离基坑开挖,分析不同近接距离下,基坑开挖对隧道的影响。随着隧道与基坑之间的距离增大,基坑开挖对隧道的影响逐渐减小。模拟了地下连续墙厚度不同时,基坑开挖对隧道的影响,发现地下连续墙的最优厚度是800mm。 (4)针对基坑开挖对隧道影响特点,提出相应的控制措施：监测方案和土体加固措施。
[Abstract]:With the process of China City, more and more construction of subway and deep foundation pit engineering. Because of the tense city land, inevitably lead to foundation pit adjacent subway tunnel which is a new problem. Deep excavation will cause many adverse effects on adjacent existing tunnel. The city subway tunnel strict deformation and settlement whether appropriate, excavation of deep foundation pit, will directly affect the safety of the tunnel.
Based on the deep foundation pit project of Beijing national financial information building, the paper uses Midas GTS software to simulate the excavation process of foundation pit, and studies the influence of deep foundation pit excavation on adjacent adjacent tunnel.
(1) reading related literature, understanding the status quo at home and abroad, and providing reference and reference for the research and analysis of this article.
(2) the theory of foundation pit deformation estimation is introduced, and the corresponding theoretical support is provided for the numerical simulation.
(3) using Midas GTS software to simulate the different excavation methods, study the influence on the tunnel. Through three-dimensional finite element analysis, found the basin excavation reasonable than Island excavation, basin excavation can effectively control the displacement and deformation of the tunnel near distance. Simulation of different excavation, analysis of different proximity distance. Effect of tunnel excavation. With the increasing distance between the tunnel and the excavation, gradually reduce the effect on tunnel excavation. The simulation of the underground continuous wall thickness at the same time, the influence on the tunnel excavation, found that the optimal thickness of underground continuous wall is 800mm.
(4) in view of the characteristics of the influence of the excavation on the tunnel, the corresponding control measures are put forward: the monitoring scheme and the soil reinforcement measures.

【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU753;U452.1

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