断层区域隧道围岩稳定性分析
发布时间：2018-11-05 19:49
【摘要】：隧道围岩稳定性一直以来都是隧道开挖过程中备受关注的问题,隧道在开挖过程中会经常遇到各种复杂多变的不良地质现象,断层就是最常见的一种不良地质现象。隧道开挖地段如果有断层破碎区段,隧道围岩就会很不稳定,所以做好断层破碎区域隧道围岩稳定性的分析对减少各类地质灾害,提高隧道高效开挖和安全支护有十分可观的现实意义。断层的存在破坏了岩层的连续性与完整性,使得断层附近围岩的应力分布差异性很大。在隧道开挖过程中断层附近的位移场、应力场、拱顶位移及最大不平衡力都将发生变化,对于这种在特殊地质条件下的隧道开挖,目前还无法得到围岩应力与位移的具体解析解。随着计算机技术的不断发展,数值计算方法也在不断地更新与进步,对于复杂的工程问题借助计算机利用数值计方法可以得到满足工程要求的数值解析,由此出现了各种数值模拟软件,成为研究岩体力学的重要手段。如果模型建立得当,初始条件和边界条件选择恰当合理的条件下,利用数值模拟分析计算得到的数据完全可以作为一种参考。论文前半部分依次对断层区域隧道围岩稳定性的研究现状、断层的工程特性、断层区域围岩稳定性做了定量的研究,应用弹性力学理论知识对断层区域隧道围岩进行受力分析,推导并总结出隧道开挖后围岩应力与位移表达式。后半部分通过利用FLAC—3D数值模拟的方法,以新七道梁隧道为背景,模拟了断层区域隧道开挖与衬砌后应力、位移分布情况。以上研究对地下工程隧道围岩稳定性分析有一定的参考价值。
[Abstract]:The stability of tunnel surrounding rock has always been a problem of great concern in the excavation process of tunnel. During the excavation of tunnel, various complicated and changeable bad geological phenomena are often encountered, and fault is the most common bad geological phenomenon. If there is fault breaking section in tunnel excavation area, the surrounding rock of tunnel will be unstable, so the stability analysis of tunnel surrounding rock in fault broken area can reduce all kinds of geological hazards. It is of great practical significance to improve the high-efficiency excavation and safety support of the tunnel. The existence of faults destroys the continuity and integrity of rock strata and makes the stress distribution of surrounding rock near the fault very different. During tunnel excavation, the displacement field, stress field, arch displacement and maximum unbalance force will all change. At present, it is impossible to obtain the concrete analytical solution of surrounding rock stress and displacement. With the continuous development of computer technology, numerical calculation methods are constantly updated and improved. For complex engineering problems, numerical analysis can be obtained to meet the requirements of engineering with the help of computer. As a result, various numerical simulation software have emerged, and become an important means of studying rock mechanics. If the model is properly established and the initial and boundary conditions are properly selected, the data obtained by numerical simulation analysis can be used as a reference. In the first half of this paper, the research status of surrounding rock stability, the engineering characteristics of fault and the stability of surrounding rock in fault region are studied in turn, and the mechanical analysis of surrounding rock in fault region is carried out by using the theory of elastic mechanics. The expressions of surrounding rock stress and displacement after tunnel excavation are deduced and summarized. In the latter part, the stress and displacement distribution of tunnel excavation and lining in fault area is simulated by using the FLAC-3D numerical simulation method and taking the new Qidaoliang tunnel as the background. The above research has certain reference value to the underground engineering tunnel surrounding rock stability analysis.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U451.2
[Abstract]:The stability of tunnel surrounding rock has always been a problem of great concern in the excavation process of tunnel. During the excavation of tunnel, various complicated and changeable bad geological phenomena are often encountered, and fault is the most common bad geological phenomenon. If there is fault breaking section in tunnel excavation area, the surrounding rock of tunnel will be unstable, so the stability analysis of tunnel surrounding rock in fault broken area can reduce all kinds of geological hazards. It is of great practical significance to improve the high-efficiency excavation and safety support of the tunnel. The existence of faults destroys the continuity and integrity of rock strata and makes the stress distribution of surrounding rock near the fault very different. During tunnel excavation, the displacement field, stress field, arch displacement and maximum unbalance force will all change. At present, it is impossible to obtain the concrete analytical solution of surrounding rock stress and displacement. With the continuous development of computer technology, numerical calculation methods are constantly updated and improved. For complex engineering problems, numerical analysis can be obtained to meet the requirements of engineering with the help of computer. As a result, various numerical simulation software have emerged, and become an important means of studying rock mechanics. If the model is properly established and the initial and boundary conditions are properly selected, the data obtained by numerical simulation analysis can be used as a reference. In the first half of this paper, the research status of surrounding rock stability, the engineering characteristics of fault and the stability of surrounding rock in fault region are studied in turn, and the mechanical analysis of surrounding rock in fault region is carried out by using the theory of elastic mechanics. The expressions of surrounding rock stress and displacement after tunnel excavation are deduced and summarized. In the latter part, the stress and displacement distribution of tunnel excavation and lining in fault area is simulated by using the FLAC-3D numerical simulation method and taking the new Qidaoliang tunnel as the background. The above research has certain reference value to the underground engineering tunnel surrounding rock stability analysis.
【学位授予单位】：兰州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U451.2
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