上砂下岩地层地铁盾构隧道侧方基坑安全水平净距研究
发布时间：2019-06-03 12:01
【摘要】：受沿线物业开发的影响，全国各地城市轨道交通结构安全保护工作面临来自地铁隧道侧方基坑工程所带来的巨大挑战。盾构隧道一方面由于自身优势在城市地铁隧道线路中所占比例越来越大，另一方面由于受侧方基坑工程施工扰动的影响，导致严重隧道病害的案例也时有发生。为解决地铁盾构隧道在外部作业施工扰动下的安全保护问题，在土地规划和侧方基坑开挖对地铁安全保护影响初步技术审查的工作中，控制隧道与基坑最小水平净距成为了一种能同时达到合理利用地铁沿线土地和保障隧道结构安全目的的实用方法。然而，目前针对如何合理划分安全水平净距的研究却较少。 本文从地铁安全保护角度出发，针对上砂下岩特殊地层条件，结合已有研究，采用三维数值分析手段，研究了以地铁盾构隧道总位移量5mm和10mm为目标控制下的安全水平净距的划分过程，并结合工程案例，说明了安全水平净距划设的实用性与合理性。 主要的研究工作如下： （1）简述了侧方基坑工程对地铁隧道结构影响规律的理论和基于安全水平净距的地铁隧道结构安全保护方法的研究现状。 （2）归纳了上砂下岩地层条件下侧方基坑开挖引起隧道位移的影响因素。通过数值模拟手段，研究了不同侧方基坑开挖深度和隧道周边所处土层物理力学参数，，以5mm和10mm为目标位移控制条件下的地铁盾构隧道与侧方基坑之间的安全水平净距。 （3）分析了地下水、隧道结构的埋深与纵向刚度、基坑的变形控制与尺寸效应对安全水平净距值的影响，并对相关影响因素下的安全水平净距值进行了修正与探讨。 （4）将研究成果初步应用于实际工程。
[Abstract]:Under the influence of property development along the line, the safety protection of urban rail transit structure in all parts of the country is facing great challenges from the side foundation pit engineering of subway tunnel. On the one hand, shield tunnel accounts for more and more proportion in urban subway tunnel line because of its own advantages, on the other hand, due to the influence of lateral foundation pit construction disturbance, serious tunnel diseases also occur from time to time. In order to solve the problem of safety protection of subway shield tunnel under the disturbance of external operation construction, in the preliminary technical examination of the influence of land planning and side foundation pit excavation on subway safety protection, Controlling the minimum horizontal net distance between tunnel and foundation pit has become a practical method to make rational use of land along subway and to ensure the safety of tunnel structure at the same time. However, there are few studies on how to reasonably divide the net distance of safety level. In this paper, from the point of view of subway safety protection, according to the special formation conditions of upper sand and rock, combined with the existing research, three-dimensional numerical analysis method is adopted. This paper studies the division process of safety level net distance under the control of total displacement 5mm and 10mm of subway shield tunnel, and explains the practicability and rationality of safety level net distance setting combined with engineering cases. The main research work is as follows: (1) the theory of the influence of lateral foundation pit engineering on subway tunnel structure and the research status of subway tunnel structure safety protection method based on safety level net distance are briefly described. (2) the influencing factors of tunnel displacement caused by lateral foundation pit excavation under the condition of upper sand and lower rock strata are summarized. By means of numerical simulation, the excavation depth of different side foundation pit and the physical and mechanical parameters of soil around the tunnel are studied. The safe horizontal net distance between subway shield tunnel and side foundation pit is controlled by 5mm and 10mm. (3) the influence of buried depth and longitudinal stiffness of groundwater and tunnel structure, deformation control and size effect of foundation pit on the net distance value of safety level is analyzed, and the net distance value of safety level under related influencing factors is revised and discussed. (4) the research results are preliminarily applied to practical engineering.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;U231
本文编号：2491924
[Abstract]:Under the influence of property development along the line, the safety protection of urban rail transit structure in all parts of the country is facing great challenges from the side foundation pit engineering of subway tunnel. On the one hand, shield tunnel accounts for more and more proportion in urban subway tunnel line because of its own advantages, on the other hand, due to the influence of lateral foundation pit construction disturbance, serious tunnel diseases also occur from time to time. In order to solve the problem of safety protection of subway shield tunnel under the disturbance of external operation construction, in the preliminary technical examination of the influence of land planning and side foundation pit excavation on subway safety protection, Controlling the minimum horizontal net distance between tunnel and foundation pit has become a practical method to make rational use of land along subway and to ensure the safety of tunnel structure at the same time. However, there are few studies on how to reasonably divide the net distance of safety level. In this paper, from the point of view of subway safety protection, according to the special formation conditions of upper sand and rock, combined with the existing research, three-dimensional numerical analysis method is adopted. This paper studies the division process of safety level net distance under the control of total displacement 5mm and 10mm of subway shield tunnel, and explains the practicability and rationality of safety level net distance setting combined with engineering cases. The main research work is as follows: (1) the theory of the influence of lateral foundation pit engineering on subway tunnel structure and the research status of subway tunnel structure safety protection method based on safety level net distance are briefly described. (2) the influencing factors of tunnel displacement caused by lateral foundation pit excavation under the condition of upper sand and lower rock strata are summarized. By means of numerical simulation, the excavation depth of different side foundation pit and the physical and mechanical parameters of soil around the tunnel are studied. The safe horizontal net distance between subway shield tunnel and side foundation pit is controlled by 5mm and 10mm. (3) the influence of buried depth and longitudinal stiffness of groundwater and tunnel structure, deformation control and size effect of foundation pit on the net distance value of safety level is analyzed, and the net distance value of safety level under related influencing factors is revised and discussed. (4) the research results are preliminarily applied to practical engineering.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.43;U231
【参考文献】
相关期刊论文 前10条
1 孙钧;市区基坑开挖施工的环境土工问题[J];地下空间;1999年04期
2 张鸿儒，侯学渊，夏明耀;深开挖对周围工程设施的影响预测[J];北方交通大学学报;1996年02期
3 孔令荣;崔永高;隋海波;;基坑开挖对邻近地铁变形的影响分析[J];工程勘察;2010年06期
4 蒋洪胜,侯学渊;基坑开挖对临近软土地铁隧道的影响[J];工业建筑;2002年05期
5 王典;;广州地铁沿线岩土分层系统的演变及继续完善建议[J];广州建筑;2011年03期
6 李钊;刘庭金;;深厚砂层下深基坑施工的实测分析[J];地下空间与工程学报;2013年S1期
7 李春良;王勇;张巍;;地下水位变化对盾构隧道的影响研究[J];隧道建设;2012年05期
8 方俊波,刁天祥;上软下硬地层地下连续墙成槽施工[J];现代隧道技术;2002年01期
9 王超峰;周彦军;;上软下硬地层地下连续墙施工技术[J];现代隧道技术;2006年04期
10 张志强;朱敏;何川;;盾构隧道纵向刚度计算方法以及影响因素研究[J];现代隧道技术;2008年S1期
本文编号：2491924
本文链接：https://www.wllwen.com/kejilunwen/jiaotonggongchenglunwen/2491924.html
