城市大跨度小净距群洞施工力学行为的研究

发布时间：2018-05-24 21:42

本文选题：群洞 + 大跨度　；参考：《重庆交通大学》2014年硕士论文

【摘要】：本文以重庆红岩村隧道洞口段为工程背景，通过数值模拟的方法，对大跨度小净距群洞的施工力学行为进行相关研究，通过对比不同开挖方法、不同开挖顺序下围岩及支护结构的应力、应变确定群洞最优的开挖方法和开挖顺序。本论文主要研究工作具体如下： ①通过对红岩村群洞下部地铁车站隧道采用不同开挖方法时围岩及支护结构力学行为的对比确定车站隧道采用双侧壁导坑法优于CRD法。 ②通过对红岩村群洞上部分别位于岩石和土层中的大跨度小净距隧道采用不同开挖顺序、不同开挖方法时围岩及支护结构力学行为的对比得到结论：先开挖上部左侧岩石中的隧道时，车站隧道和左行车道隧道都采用双侧壁导坑法为最优的开挖方法；先开挖上部右侧土层中的隧道时，车站隧道和右行车道隧道都采用双侧壁导坑法为最优的开挖方法。 ③综合分析红岩村进口群洞在不同开挖方法、开挖顺序下，群洞间围岩、支护结构的受力和变形相互作用规律，得到群洞上部先开挖左侧岩石隧道，后开挖右侧土层隧道为最优的开挖顺序。 ④针对红岩村进口群洞在上部左侧岩石隧道先行的开挖顺序下，左行车道隧道采用双侧壁导坑法、右行车道隧道采用CRD法为两洞室最合理的施工工法。
[Abstract]:In this paper, based on the engineering background of Hongyan Village Tunnel in Chongqing, through numerical simulation, the construction mechanics behavior of large span and small clearance tunnel is studied, and the different excavation methods are compared. The stress and strain of surrounding rock and supporting structure under different excavation order determine the optimal excavation method and excavation sequence of group holes. The main research work of this thesis is as follows: The main results are as follows: (1) by comparing the mechanical behavior of surrounding rock and supporting structure of subway station tunnel in the lower part of Hongyancun tunnel with different excavation methods, it is confirmed that the double-sidewall tunnel method is superior to CRD method. (2) different excavation sequence is adopted for the tunnel with large span and small clear distance located in the rock and soil layer in the upper part of the hole in Hongyan Village Group, respectively. Comparing the mechanical behavior of surrounding rock and supporting structure with different excavation methods, it is concluded that when excavating the tunnel in the upper left rock, both the station tunnel and the left carriageway tunnel adopt the double-sidewall tunnel method as the optimal excavation method. When the tunnel in the upper right soil layer is first excavated, both the station tunnel and the right carriageway tunnel are excavated with double-sidewall guide pit method as the optimal excavation method. (3) comprehensively analyzing the interaction law of stress and deformation of surrounding rock and supporting structure between the surrounding rock and supporting structure in the different excavation methods of the entrance group tunnel in Hongyan Village, and obtaining the first excavation of the left rock tunnel in the upper part of the group tunnel. After excavation of the right soil tunnel is the optimal excavation sequence. (4) according to the excavation sequence of the upper left rock tunnel in Hongyan Village entrance tunnel, the double sidewall tunnel method is adopted in the left lane tunnel and the CRD method is adopted in the right lane tunnel as the most reasonable construction method for the two caverns.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4

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