深埋输水隧洞TBM开挖过程中围岩稳定性数值分析

发布时间：2018-02-04 23:45

本文关键词： TBM 深埋隧洞围岩稳定衬砌管片位移应力数值模拟　出处：《浙江工业大学》2014年硕士论文　论文类型：学位论文

【摘要】：围岩稳定性评价是指导地下工程安全施工的重要环节。随着TBM法施工在深埋隧洞中较传统钻爆法技术和经济优势的体现,针对深埋隧洞的施工特点,如何确保TBM开挖过程中的围岩稳定成为岩土工程研究的热点和难点之一,对工程安全施工具有重要的意义。本文以山西中部引黄工程总干3#输水隧洞为工程实例,对岩土体的弹塑性分析理论进行研究并对TBM掘进过程中影响围岩稳定性的因素进行总结；采用有限元差分软件FLAC3D建立了TBM法施工隧洞围岩的数值仿真计算模型,选取施工仿真模拟所需岩体物理力学参数,针对埋深、侧压系数、内摩擦角、洞径等因素对隧洞围岩稳定性的影响进行了计算分析；对开挖过程进行数值模拟,分析了不同工况条件下围岩和衬砌管片的位移、应力及演化规律；讨论比较不同围岩应力释放率对围岩及衬砌管片受力特性的影响；同时分析了围岩和衬砌管片的变形及应力随掌子面推进的变化规律。分析结论可为总干隧洞及同类工程的合理设计和安全施工提供参考。
[Abstract]:The evaluation of surrounding rock stability is an important link to guide the safe construction of underground engineering. With the embodiment of TBM construction in deep buried tunnel compared with the traditional drilling and blasting technology and economic advantages, the construction characteristics of deep buried tunnel are pointed out. How to ensure the stability of surrounding rock in the process of TBM excavation has become one of the hot and difficult points in geotechnical engineering, which is of great significance to the safe construction of engineering. In this paper, the elastic-plastic analysis theory of rock and soil mass is studied by taking the tunnel of the main trunk of Shanxi Yellow River diversion Project as an example, and the factors influencing the stability of surrounding rock in the process of TBM tunneling are summarized. The finite element difference software FLAC3D is used to establish the numerical simulation model of surrounding rock mass in tunnel construction by TBM method. The physical and mechanical parameters of rock mass required by construction simulation simulation are selected, aiming at the buried depth and lateral pressure coefficient. The influence of internal friction angle and diameter on the stability of surrounding rock is calculated and analyzed. Numerical simulation of the excavation process is carried out, and the displacement, stress and evolution of surrounding rock and lining segment under different working conditions are analyzed. The effects of stress release rate of surrounding rock on the mechanical characteristics of surrounding rock and lining segment are discussed and compared. At the same time, the variation law of deformation and stress of surrounding rock and lining segment with the advancing of face surface is analyzed. The conclusion of the analysis can provide a reference for the rational design and safe construction of the general tunnel and similar projects.
【学位授予单位】：浙江工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TV554;TV223

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