地裂缝场地地铁隧道的安全避让距离研究
发布时间：2018-08-29 12:16
【摘要】：西安地裂缝是一种独特的城市地质灾害，其活动对西安地铁建设造成严重威胁，，西安地铁建设的关键是如何解决地铁隧道通过地裂缝场地的问题。本文以西安地铁三号线通过地裂缝场地为研究对象，以国内外对地裂缝研究现状为依据，在地裂缝基本特征分析和未来活动趋势预测的基础上，开展了地铁隧道穿越地裂缝场地的上、下盘时的避让距离研究。 通过地铁隧道从上盘平行穿越地裂缝带的大型物理模型试验，揭示了地铁隧道穿越地裂缝上盘时的受力变形特征、破坏模式以及影响范围，确定了地铁隧道位于地裂缝上盘平行通过地裂缝带时的安全避让距离为30m。同时，利用MIDAS/GTS有限元软件，建立了地裂缝场地地铁隧道位于上盘和下盘时的数值模型，通过给上盘施加不同的强制沉降位移，分析计算了地裂缝活动作用下地铁隧道与地裂缝带的距离的不同对地铁隧道围岩土体的侧向水平位移变化、结构的水平位移、内力及宏观变形等的影响，并对结构及岩土体变形破坏特征进行分析，与模型试验所得结果进行对比，揭示了地铁隧道穿越地裂缝场地上盘、下盘时隧道结构的性状。 结合平行于活动地裂缝带的地铁隧道位移场、结构变形及内力特征以及地裂缝场地的避让距离规范要求，提出了地裂缝场地地铁隧道分别位于上盘和下盘的安全避让距离为30m和15m，研究结果可为西安地铁三号线及后续其他线路类似工程的设计、施工及安全运营提供科学的理论指导和设计依据，并进一步丰富了地裂缝活动对地下结构影响方面的研究成果。
[Abstract]:Xi'an ground fissure is a unique urban geological hazard, and its activities pose a serious threat to Xi'an subway construction. The key of Xi'an subway construction is how to solve the problem of subway tunnel passing through the ground fissure site. This paper takes Xi'an Metro Line 3 as the research object, based on the current situation of research on ground fissures at home and abroad, on the basis of the analysis of the basic characteristics of the ground fractures and the prediction of the future activity trend. In this paper, the study on the avoidance distance of subway tunnel through ground fissures is carried out. Based on the large-scale physical model test of the subway tunnel parallel crossing the ground fissure zone from the upper wall, the stress deformation characteristics, failure mode and influence range of the subway tunnel passing through the upper face of the ground fissure are revealed. It is determined that the safe distance of subway tunnel passing through the ground fissure is 30m when it is located on the upper side of the ground fissure. At the same time, using MIDAS/GTS finite element software, the numerical model of subway tunnel in the ground fissure site is established when it is located on the upper and lower sides. By applying different forced settlement displacements to the upper wall, the numerical model of the subway tunnel in the ground fissure site is established. The influence of the distance between subway tunnel and ground fissure zone on lateral displacement, horizontal displacement, internal force and macroscopic deformation of surrounding rock mass of subway tunnel is analyzed and calculated under the action of ground fissures. The deformation and failure characteristics of structure and rock and soil are analyzed and compared with the results of model test. The characteristics of tunnel structure are revealed when the tunnel passes through the upper and lower face of ground fissures. Combined with the displacement field of subway tunnel parallel to the active ground crack zone, the characteristics of structural deformation and internal force, as well as the requirements of the code for avoiding distance of ground fissure site, It is put forward that the safe avoiding distance of subway tunnel in the ground fissure site is 30m and 15m respectively in the upper and lower trays. The results can be used for the design of Xi'an Metro Line No. 3 and other similar projects. Construction and safety operation provide scientific theoretical guidance and design basis, and further enrich the research results of the influence of ground fissure activities on underground structures.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231;U455
本文编号：2211180
[Abstract]:Xi'an ground fissure is a unique urban geological hazard, and its activities pose a serious threat to Xi'an subway construction. The key of Xi'an subway construction is how to solve the problem of subway tunnel passing through the ground fissure site. This paper takes Xi'an Metro Line 3 as the research object, based on the current situation of research on ground fissures at home and abroad, on the basis of the analysis of the basic characteristics of the ground fractures and the prediction of the future activity trend. In this paper, the study on the avoidance distance of subway tunnel through ground fissures is carried out. Based on the large-scale physical model test of the subway tunnel parallel crossing the ground fissure zone from the upper wall, the stress deformation characteristics, failure mode and influence range of the subway tunnel passing through the upper face of the ground fissure are revealed. It is determined that the safe distance of subway tunnel passing through the ground fissure is 30m when it is located on the upper side of the ground fissure. At the same time, using MIDAS/GTS finite element software, the numerical model of subway tunnel in the ground fissure site is established when it is located on the upper and lower sides. By applying different forced settlement displacements to the upper wall, the numerical model of the subway tunnel in the ground fissure site is established. The influence of the distance between subway tunnel and ground fissure zone on lateral displacement, horizontal displacement, internal force and macroscopic deformation of surrounding rock mass of subway tunnel is analyzed and calculated under the action of ground fissures. The deformation and failure characteristics of structure and rock and soil are analyzed and compared with the results of model test. The characteristics of tunnel structure are revealed when the tunnel passes through the upper and lower face of ground fissures. Combined with the displacement field of subway tunnel parallel to the active ground crack zone, the characteristics of structural deformation and internal force, as well as the requirements of the code for avoiding distance of ground fissure site, It is put forward that the safe avoiding distance of subway tunnel in the ground fissure site is 30m and 15m respectively in the upper and lower trays. The results can be used for the design of Xi'an Metro Line No. 3 and other similar projects. Construction and safety operation provide scientific theoretical guidance and design basis, and further enrich the research results of the influence of ground fissure activities on underground structures.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U231;U455
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