铁路隧道围岩蠕变对TBM圆形衬砌力学特性的影响研究

发布时间：2018-01-17 14:39

本文关键词：铁路隧道围岩蠕变对TBM圆形衬砌力学特性的影响研究　出处：《西南交通大学》2017年硕士论文　论文类型：学位论文

【摘要】：近年来,随着基础设施建设重心逐步西移,众多连接西部与东、中部地区的铁路公路提上日程,涌现出大量埋深较大、存在高地应力的长大隧道工程。在高地应力作用下,围岩往往发生蠕变现象,给结构安全营运造成影响。因此,有必要对基于均质圆环模型的盾构隧道蠕变分析方法、地质体地形三维建模、构造应力场三维反演方法、构造应力场下隧道围岩蠕变特性等开展研究。有鉴于此,本文结合中国铁路总公司科技研究开发计划课题,研究了围岩蠕变作用下TBM法铁路隧道的结构力学特性。主要研究工作如下:1、基于Burgers蠕变模型,分别给出了毛洞和衬砌支护条件下隧道蠕变的位移解析解。针对高黎贡山隧道,分析了不同掌子面影响系数下隧道围岩的蠕变特性。2、基于均质圆环模型、考虑Burgers蠕变荷载,分别采用荷载结构模型和地层结构模型,对圆形隧道进行了蠕变力学特性分析,对比了两种分析方法的优缺点。3、基于梁弹簧地层结构模型,考虑管片衬砌接头非线性特性,分析了高黎贡山隧道在围岩蠕变条件下的力学特性。4、利用多元回归分析原理,基于地质体地形三维建模,考虑自重应力场、水平挤压应力场、水平剪切应力场以及竖直剪切应力场等工况的回归分析方法,获得了初始构造应力场的线性回归方程。5、在地质体地形三维模型条件下,分析了构造应力条件下围岩蠕变对隧道衬砌结构位移的影响规律。
[Abstract]:In recent years, with the gradual shift of the center of gravity of infrastructure construction to the west, a large number of railway highways connecting the west to the east and the middle of the region have been put on the agenda, and a large number of buried depth have emerged. There is a large tunnel project with high ground stress. Under the action of high ground stress, the creep phenomenon often occurs in surrounding rock, which affects the safe operation of the structure. It is necessary to analyze the creep of shield tunnel based on homogeneous ring model, to model the terrain of geological body and to invert the stress field. The creep characteristics of tunnel surrounding rock under tectonic stress field were studied. In view of this, this paper combined with the China Railway Corporation scientific and technological research and development project. The structural mechanical properties of TBM railway tunnel under the action of surrounding rock creep are studied. The main research work is as follows: 1, based on Burgers creep model. The displacement analytical solution of tunnel creep under the condition of Mao cave and lining support is given respectively. For Gaoligongshan tunnel, the creep characteristics of surrounding rock of the tunnel under the influence coefficient of different face face are analyzed. 2, based on the homogeneous ring model. Considering Burgers creep load, the creep mechanical properties of circular tunnel are analyzed by using load structure model and stratum structure model respectively, and the advantages and disadvantages of the two analysis methods are compared. Based on the beam spring stratum structure model and considering the nonlinear characteristics of segment lining joint, the mechanical properties of Goligongshan tunnel under the creep condition of surrounding rock are analyzed. 4. The principle of multivariate regression analysis is used. Based on the 3D modeling of geological body, the regression analysis method of gravity stress field, horizontal extrusion stress field, horizontal shear stress field and vertical shear stress field is considered. The linear regression equation of initial tectonic stress field. 5. Under the condition of 3D model of geological body topography, the influence of surrounding rock creep on the displacement of tunnel lining structure under the condition of tectonic stress is analyzed.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U451

【参考文献】