地裂缝带地铁动荷载作用下隧道—地层动力响应数值模拟研究

发布时间：2018-03-10 00:22

本文选题：地裂缝　切入点：地铁隧道　出处：《长安大学》2014年硕士论文　论文类型：学位论文

【摘要】：随着城市规模的不断扩大，地面交通的压力也在增大，开发地下空间已是大势所趋，近年来，为缓解城市交通的拥堵，地铁的建设便在各大城市兴起。在西安，地铁的建设也进入了新的时期。目前，西安地铁1、2号线已经先后开始运营，其他线路的建设正如火如荼，由于西安特殊的地质条件以及地裂缝的存在，给地铁建设带来了一系列新的课题，其中地铁隧道-地层-地裂缝动力相互作用的问题以及地铁运行诱发振动等问题，都成为人们关注的重要课题，而地铁动荷载是否会影响到地裂缝带地铁隧道的安全运营，，已是地铁建设中迫切需要研究的重要课题。本文以西安地铁2号线为工程背景，依托国家自然科学基金项目地铁动荷载作用下的地层-地裂缝-隧道相互作用研究‖，重点研究了地裂缝场地隧道-地层的振动响应和地铁振动的传播规律，以及隧道-地层动力作用下的动应力与变形特点。本文的研究手段为数值模拟，研究内容包括：（1）通过查阅文献，总结了地铁振动的产生机理、振动传播的一般规律及振动强度的影响因素；（2）提出了基于ABAQUS的隧道-地层-地裂缝模型三维振动响应数值模拟方法，给出了地铁移动荷载的施加方法；（3）通过对整体式隧道模型和分段式隧道模型及无地裂缝隧道模型振动响应的模拟，分析了地裂缝场地地铁振动的传播规律，对有无地裂缝模型、整体式和分段式模型的振动响应进行了对比，分析了地裂缝对振动响应的影响以及隧道的分段对振动响应的影响。并且针对分段式隧道模型，分析了车速对振动响应的影响；（4）通过对整体式和分段式隧道模型动应力与变形的分析，得到了土与衬砌中动应力的传递及分布规律，以及土体的变形与分布规律。本文的研究成果对特殊场地地铁振动的研究有一定的参考价值，为地铁安全运营监测提供了参考，为制定完善的地裂缝场地地铁振动控制标准奠定了基础，也为本项目后续进一步的试验和实测工作起到了参考作用。
[Abstract]:With the continuous expansion of urban scale, the pressure of ground transportation is also increasing, and the development of underground space has become a general trend. In recent years, in order to ease the congestion of urban traffic, subway construction has risen in major cities. The construction of the subway has also entered a new period. At present, the Xi'an Metro Line 1 and 2 have already been put into operation one after another, and the construction of other lines is in full swing. Due to the special geological conditions and the existence of ground cracks in Xi'an, A series of new problems have been brought to the subway construction, among which the dynamic interaction between subway tunnel and ground fissures and the vibration induced by subway operation have become an important issue that people pay attention to. Whether the dynamic load of subway will affect the safe operation of subway tunnel with ground fissures is an important subject that needs to be studied urgently in subway construction. Taking Xi'an Metro Line 2 as the engineering background and relying on the project of National Natural Science Foundation of China, this paper studies the interaction between strata, ground fissure and tunnel under dynamic load of subway. In this paper, the vibration response of tunnel and stratum and the propagation law of subway vibration in ground fissure site are mainly studied, and the dynamic stress and deformation characteristics under the action of tunnel and stratum dynamics are also studied. The research means of this paper are numerical simulation, the research contents include:. 1) the mechanism of subway vibration, the general law of vibration propagation and the influencing factors of vibration intensity are summarized by consulting literature. (2) the numerical simulation method of three-dimensional vibration response of tunnel-stratigraphic-ground fracture model based on ABAQUS is proposed, and the method of applying moving load of subway is given. 3) by simulating the vibration response of integral tunnel model, segmented tunnel model and ground fissured tunnel model, the propagation law of subway vibration in ground fissure site is analyzed, and the ground crack model with or without ground crack is analyzed. The effects of ground fissures on vibration response and the influence of tunnel segments on vibration response are analyzed, and the influence of vehicle speed on vibration response is analyzed for segmented tunnel model. 4) through the analysis of dynamic stress and deformation of integral and segmented tunnel models, the law of dynamic stress transfer and distribution in soil and lining, and the deformation and distribution of soil are obtained. The research results of this paper have certain reference value for the study of subway vibration in special site, provide a reference for subway safety operation monitoring, and lay a foundation for the establishment of perfect control standard of subway vibration in ground fissure site. It also plays a reference role in the further test and measurement of this project.
【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;U451.3

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