双孔粘土隧道地表沉降规律研究

发布时间：2018-07-04 07:25

本文选题：双孔隧道 + 横向沉降　；参考：《重庆大学》2014年硕士论文

【摘要】：随着我国经济的发展，为了满足交通需求，很多城市纷纷建造地铁隧道，而且所建的地铁隧道一般都是双孔平行的。隧道施工将不可避免地引起地面的沉降，而当地表沉降比较大时，地下管线以及地面交通的正常使用会受到影响。现今，单孔隧道施工引起的地表沉降的研究比较多，，而对于双孔平行隧道施工引起的地表沉降研究因为其规律比较复杂，研究起来不方便，所以大部分研究往往注重研究地表横向沉降，而对于地表纵向沉降研究得很少。因此，有必要对双孔平行隧道施工过程中引起的地表横向沉降和纵向沉降进行预测。鉴于现代大型计算机的快速发展，可用有限元软件对隧道施工引起的地表沉降进行模拟。本文在查阅了国内外大量文献的基础上，运用FLAC3D软件模拟了弹性和弹塑性时地表沉降的规律，并用Schwarz交替法推导了在弹性条件下双孔隧道施工引起的地表沉降规律。主要内容包括： 1.研究不同埋深时双孔隧道施工所引起的地表纵向（掌子面推进方向）沉降曲线，总结出埋深对于地表纵向沉降的影响。 2.用FLAC3D软件进行模拟，研究两隧道的间距、隧道深径比、地层损失率对于地表横向（掌子面所在方向）沉降的影响。 3.通过改变两隧道的埋深，使两隧道不在同一平面上。研究两隧道埋深不同时对于地表沉降的影响。 4.运用复变函数和Schwarz交替法推导半无限平面内双孔隧道施工引起的地表横向沉降，并和弹性条件下双孔隧道的地表横向沉降进行验证。
[Abstract]:With the development of our economy, in order to meet the traffic demand, many cities have built subway tunnels, and the subway tunnels are usually two-hole parallel. Tunnel construction will inevitably cause land subsidence, and when the surface subsidence is large, the normal use of underground pipelines and surface traffic will be affected. Nowadays, there are many researches on the surface settlement caused by the construction of single hole tunnel, but the study of surface settlement caused by the construction of two-hole parallel tunnel is not convenient because of its complicated law. Therefore, most of the studies focus on the study of lateral surface subsidence, but very little research on surface longitudinal settlement. Therefore, it is necessary to predict the lateral and longitudinal settlement of the surface caused by the construction of the two-hole parallel tunnel. In view of the rapid development of modern mainframe computer, the surface settlement caused by tunnel construction can be simulated by finite element software. On the basis of consulting a large number of literatures at home and abroad, this paper simulates the law of surface subsidence under elastic and elastic-plastic conditions by using FLAC3D software, and deduces the law of surface subsidence caused by double-hole tunnel construction under elastic conditions by Schwarz alternating method. The main contents include: 1. This paper studies the settlement curve of the surface longitudinal (the propelling direction of the palm surface) caused by the construction of the double-hole tunnel under different buried depths, and summarizes the influence of the buried depth on the surface longitudinal settlement. 2. By using FLAC3D software, the effects of the distance between two tunnels, the ratio of tunnel depth to diameter and the rate of formation loss on the lateral settlement of the surface (the direction of the face) are studied. By changing the depth of the two tunnels, the two tunnels are not on the same plane. The influence of different buried depth of two tunnels on surface subsidence is studied. 4. By using the complex variable function and Schwarz alternating method, the surface lateral settlement caused by the construction of the two-hole tunnel in the semi-infinite plane is deduced, and verified with the surface lateral settlement of the double-hole tunnel under elastic conditions.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3

【参考文献】