近水平岩层隧道塌方机理研究

发布时间：2018-03-31 04:25

本文选题：水平岩层　切入点：塌方　出处：《重庆交通大学》2015年硕士论文

【摘要】：在隧道实际施工过程中,不可避免的遇到水平层状岩体。隧道在水平层状岩体中开挖,由于水平岩层的构造特点以及层面的存在,隧道支护以及围岩的受力变形将受到很大程度的影响。其受力形式主要由水平岩层的构造特点决定。本文采用理论分析和数值分析相结合的方法,基于实际隧道塌方实例,分析水平岩层隧道的受力变形特点,对水平岩层隧道塌方机理进行探究。主要研究内容有:①从水平岩层构造特点出发,在分析层面的基础上,分析水平岩层的构造变形特征,对隧道围岩失稳类型和稳定性因素进行分析,总结水平岩层破坏模式。②依托城口至万源快速公路通道水平岩层石塘隧道,利用有限元软件ANSYS建立石塘隧道的数值模拟模型,对石塘隧道的受力状态进行研究,了解水平岩层隧道施工过程中围岩与支护结构的力学变形特征,同时将数值模拟结果与现场施工监控数据进行对比分析,论证数值模拟的可靠性。③根据石塘隧道施工的具体情况,利用ANSYS软件建立隧道贯通段开挖的三维模型,研究隧道开挖过程中,围岩以及支护结构的受力、变形规律。④针对爆破振动的影响,利用ANSYS/LS-DYNA动力学软件,建立石塘隧道三维爆破振动模型,研究爆破振动条件下,围岩以及支护结构的响应,分析爆破振动对水平岩层隧道稳定性的影响。⑤基于石塘隧道塌方实例,结合平面模型、三维模型和爆破振动模型的研究结果,对万源石塘隧道塌方进行分析,研究水平岩层隧道塌方的过程与受力变形破坏机理。
[Abstract]:In the process of tunnel construction, it is inevitable to encounter horizontal layered rock mass.Tunnel excavation in horizontal layered rock mass, due to the structural characteristics of horizontal strata and the existence of layers, tunnel support and surrounding rock deformation will be greatly affected.Its stress form is mainly determined by the structural characteristics of horizontal strata.In this paper, the method of combining theoretical analysis with numerical analysis is used to analyze the deformation characteristics of horizontal rock stratum tunnel based on the actual tunnel collapse example, and the mechanism of horizontal rock stratum tunnel collapse is explored.The main research contents are as follows: from the structural characteristics of horizontal strata, on the basis of analysis, the structural deformation characteristics of horizontal strata are analyzed, and the instability types and stability factors of tunnel surrounding rock are analyzed.This paper summarizes the horizontal rock failure mode .2 based on the horizontal rock stratum tunnel of Chengkou to Wanyuan Expressway. The numerical simulation model of the tunnel is established by using finite element software ANSYS, and the stress state of the tunnel is studied.To understand the mechanical deformation characteristics of surrounding rock and supporting structure during the construction of horizontal rock tunnel, and to compare the numerical simulation results with the field construction monitoring data.The reliability of numerical simulation .3 according to the concrete situation of Shitang tunnel construction, using ANSYS software to establish the three-dimensional model of tunnel through section excavation, to study the stress of surrounding rock and supporting structure during tunnel excavation.According to the influence of blasting vibration, the three-dimensional blasting vibration model of Shitang tunnel is established by using ANSYS/LS-DYNA software, and the response of surrounding rock and supporting structure under blasting vibration is studied.Analysis of the influence of blasting Vibration on the Stability of horizontal Rock Tunnel based on the example of collapse in Shitang tunnel, combined with the research results of plane model, three-dimensional model and blasting vibration model, the collapse of Wanyuan Shitang tunnel is analyzed.The process of horizontal rock tunnel collapse and the mechanism of deformation and failure are studied.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U458.3

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