黄土地区浅埋暗挖地铁隧道的沉降与变形分析

发布时间：2018-05-30 06:58

本文选题：浅埋暗挖隧道 + 现场监测　；参考：《西安建筑科技大学》2015年硕士论文

【摘要】：随着城市轨道交通的飞速发展,城市地铁正在加速建设当中。目前,浅埋暗挖法是城市地铁施工常用的一种方法,地铁开挖会引起地层移动而导致不同程度的位移和沉降,车辆在行驶过程中也会对隧道结构的变形造成影响,而对黄土地区地铁施工受地表车辆荷载的影响研究较为少见。针对上述问题,本文以西安市地铁四号线飞天路~航天大道站区间工程实例为依托,采用现场监测和数值模拟相结合的研究方法,对黄土地区浅埋暗挖地铁隧道的沉降与变形进行了研究。主要工作如下:结合隧道现场施工对地表下沉、拱顶沉降、水平收敛和围岩压力进行监测,通过对监测结果分析,得到了地铁开挖对隧道及周边环境的影响规律。运用ANSYS有限元软件建立了双线平行地铁隧道开挖的数值模型,分析了隧道开挖对地表沉降、初期支护、地下管线的影响。通过将数值模拟结果与实测数据进行对比,验证了模型的合理性。进一步的研究发现,隧道洞口处的拱顶沉降、初期支护主应力相比隧道其它断面较大。结合实际工程,对隧道洞口处初期支护的振动响应问题进行了瞬态分析。分别研究了在单线车辆荷载和双线车辆荷载作用下,隧道初期支护在不同车速、载重下的振动响应。结果表明双线车辆同向行驶的情况下对结构产生的影响最为不利。此外,车辆相对行驶相遇时对隧道支护结构产生的振动响应也较大。文章研究成果对评价隧道结构受车辆荷载的影响,以及对地铁隧道结构设计理论的完善有一定参考价值。
[Abstract]:With the rapid development of urban rail transit, urban subway is accelerating construction. At present, shallow excavation method is a common method in urban subway construction. Subway excavation will cause ground movement, resulting in different degrees of displacement and settlement, and the vehicle will also have an impact on the deformation of tunnel structure in the course of driving. However, it is rare to study the influence of surface vehicle load on subway construction in loess area. In view of the above problems, based on the engineering example of Feitian Road ~ Aerospace Avenue Station in Xi'an Metro Line No. 4, this paper adopts the research method of combining field monitoring and numerical simulation. The settlement and deformation of shallow-buried subway tunnel in loess area are studied. The main work is as follows: combined with the site construction of the tunnel to monitor the ground subsidence, vault settlement, horizontal convergence and surrounding rock pressure, through the analysis of the monitoring results, the influence of subway excavation on the tunnel and its surrounding environment is obtained. The numerical model of double-line parallel subway tunnel excavation is established by using ANSYS finite element software, and the influence of tunnel excavation on ground subsidence, initial support and underground pipeline is analyzed. The rationality of the model is verified by comparing the numerical simulation results with the measured data. It is found that the initial support principal stress is larger than that of other sections of the tunnel. Combined with the actual engineering, the transient analysis of the vibration response of the initial support at the tunnel entrance is carried out. In this paper, the vibration response of tunnel initial support at different speed and load is studied under the action of single line vehicle load and double line vehicle load respectively. The results show that the double-track vehicle has the most adverse effect on the structure when it is running in the same direction. In addition, the vibration response of the vehicle to the tunnel support structure is larger when the vehicle meets each other. The research results of this paper have some reference value for evaluating the influence of vehicle load on tunnel structure and improving the design theory of subway tunnel structure.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U455.4;U231.3

【参考文献】