基于压力拱理论及应力释放率的隧道围岩稳定性研究
发布时间：2019-03-12 19:35
【摘要】：隧道的开挖过程中,隧道周围的岩体应力状态随即发生改变。压力拱效应的形成对隧道的自稳能力以及隧道的深、浅埋划分有着决定性作用,这也是对于软弱或具有流变性质的围岩,隧道支护结构设计中围岩应力释放率的选择的一个重要的参考。本文采用数值方法,研究了隧道结构设计参数、工程地质条件、压力拱效应以及围岩应力释放率之间的内在关系,具体内容如下:(1)以京新高速金盆湾隧道为工程依托,描述了隧道施工过程中的压力拱效应,采用应力路径分析方法,给出了隧道压力拱的定义和内、外边界的确定方法。(2)通过MIDAS/GTS数值模拟,定量地研究了隧道埋深、隧道跨度、围岩力学参数、隧道围岩分层、施工过程等因素对压力拱的影响规律。从数值结果可以看出,若要形成压力拱效应,隧道存在临界成拱埋深,在既定地质条件下,隧道跨度是影响临界成拱埋深的最大因素。(3)以隧道能否性形成有效的压力拱为依据,给出了金盆湾隧道压力拱临界成拱埋深,进行了深、浅埋的判定与划分,通过与测量数据对比,为隧道的动态设计和施工提供了一定的参考。(4)采用MIDAS/GTS软件建立了金盆湾隧道的三维计算模型,分析了围岩应力释放率对压力拱效应、隧道变形及支护结构受力的影响。结果表明:对于金盆湾软弱围岩隧道,初次应力释放率是影响开挖过程中围岩稳定性的重要因素。
[Abstract]:During the excavation of the tunnel, the stress state of the surrounding rock mass changes. The formation of pressure arch effect plays a decisive role in the self-stabilization ability of tunnel and the division of tunnel depth and shallow burial, which is also the case of weak or rheological surrounding rock. It is an important reference for the selection of stress release rate of surrounding rock in the design of tunnel supporting structure. In this paper, the internal relations among structural design parameters, engineering geological conditions, pressure arch effect and stress release rate of surrounding rock are studied by numerical method. The concrete contents are as follows: (1) based on Jinpenwan tunnel of Jingxin high-speed highway, the internal relationship between the parameters of tunnel structure design and the stress release rate of surrounding rock is studied. The effect of pressure arch in tunnel construction is described, and the definition of tunnel pressure arch and the determination of inner and outer boundary are given by means of stress path analysis. (2) the buried depth of tunnel is quantitatively studied by means of MIDAS/GTS numerical simulation. The influence of tunnel span, surrounding rock mechanical parameters, surrounding rock stratification, construction process and other factors on pressure arch. It can be seen from the numerical results that if the pressure arch effect is to be formed, the tunnel has a critical arch buried depth, and under the given geological conditions, The span of tunnel is the biggest factor affecting the critical arch depth. (3) based on the effective pressure arch formed by the tunnel, the critical arch depth of Jinpenwan tunnel pressure arch is given, and the judgment and division of deep and shallow burial are carried out. By comparing with the measured data, some references are provided for the dynamic design and construction of the tunnel. (4) the three-dimensional calculation model of Jinpenwan Tunnel is established by using MIDAS/GTS software, and the effect of surrounding rock stress release rate on pressure arch is analyzed. The influence of tunnel deformation and support structure. The results show that the initial stress release rate is an important factor affecting the stability of surrounding rock during excavation for Jinpenwan soft surrounding rock tunnel.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.2
本文编号：2439086
[Abstract]:During the excavation of the tunnel, the stress state of the surrounding rock mass changes. The formation of pressure arch effect plays a decisive role in the self-stabilization ability of tunnel and the division of tunnel depth and shallow burial, which is also the case of weak or rheological surrounding rock. It is an important reference for the selection of stress release rate of surrounding rock in the design of tunnel supporting structure. In this paper, the internal relations among structural design parameters, engineering geological conditions, pressure arch effect and stress release rate of surrounding rock are studied by numerical method. The concrete contents are as follows: (1) based on Jinpenwan tunnel of Jingxin high-speed highway, the internal relationship between the parameters of tunnel structure design and the stress release rate of surrounding rock is studied. The effect of pressure arch in tunnel construction is described, and the definition of tunnel pressure arch and the determination of inner and outer boundary are given by means of stress path analysis. (2) the buried depth of tunnel is quantitatively studied by means of MIDAS/GTS numerical simulation. The influence of tunnel span, surrounding rock mechanical parameters, surrounding rock stratification, construction process and other factors on pressure arch. It can be seen from the numerical results that if the pressure arch effect is to be formed, the tunnel has a critical arch buried depth, and under the given geological conditions, The span of tunnel is the biggest factor affecting the critical arch depth. (3) based on the effective pressure arch formed by the tunnel, the critical arch depth of Jinpenwan tunnel pressure arch is given, and the judgment and division of deep and shallow burial are carried out. By comparing with the measured data, some references are provided for the dynamic design and construction of the tunnel. (4) the three-dimensional calculation model of Jinpenwan Tunnel is established by using MIDAS/GTS software, and the effect of surrounding rock stress release rate on pressure arch is analyzed. The influence of tunnel deformation and support structure. The results show that the initial stress release rate is an important factor affecting the stability of surrounding rock during excavation for Jinpenwan soft surrounding rock tunnel.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U451.2
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，本文编号：2439086
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