浅埋小净距平行隧道开挖模拟分析

发布时间：2018-06-04 09:33

本文选题：浅埋 + 小净距　；参考：《重庆交通大学》2014年硕士论文

【摘要】：随着城市经济的不断发展，中西部大开发的不断深入，交通行业的发展已经进入一个高峰期。随着城市路面交通的不断饱和，城市内汽车量逐渐增多，地面交通已经不能满足日益增长的交通需求，发展地下交通便成为解决交通压力的一个非常可行的措施。在地下交通工程中浅埋小净距平行隧道是交通建设中常常遇到的一种隧道类型，然而，浅埋小净距平行隧道较一般的隧道更为复杂，我们要在保证隧道安全的同时也要减小隧道施工对周围环境的影响。本文以重庆轨道交通6号线中梁山1#隧道和南变电所洞室作为工程依托对象，主要研究内容和理论成果如下： ①对浅埋暗挖隧道开挖引起地表沉降的机理进行详细分析，阐述了隧道开挖引起地表沉降的影响因素和预测地表沉降方法的国内外研究现状。 ②系统地总结了浅埋小净距平行隧道施工力学基本原理及其施工方法，介绍了有限元基本原理、有限元离散化的涵义、隧道开挖过程围岩应力场的变化以及如何利用有限元对隧道的开挖过程进行模拟。 ③对隧道围岩的稳定性和其失稳机理作了研究，同时对弱面体围岩的弱面屈服准则和弱面最不利位置也作了一些判定。 ④对隧道深浅埋进行系统的划分，，对隧道施工引起围岩松散压力的形成进行理论分析，对围岩松散压力的传统计算方法和修正方法进行了比较，对隧道开挖后的围岩的应力和变形作了弹塑性分析，并简要描述了隧道开挖引起地表变形的损害形式。 ⑤通过设计资料了解重庆市轨道交通6号线中梁山1#隧道和南变电所洞室的施工特点，在确保隧道施工安全的前提下必须要减小对周边环境的影响，通过控制隧道的埋深条件，运用大型有限分软件ANSYS对隧道进行了二维有限元数值模拟分析。由数值模拟分析得出的结果对地表沉降、隧道结构应力和应变、衬砌支护的内力等方面进行综合对比研究，对计算结果分析得出了一些基本规律，并由此确定最优的隧道埋置深度，本文的研究成果可对将来出现的相似工程提供设计和施工建议。
[Abstract]:With the development of the urban economy and the development of the central and western regions, the development of the transportation industry has entered a peak period. With the continuous saturation of urban road traffic and the increasing number of vehicles in the city, the ground transportation can no longer meet the increasing traffic demand. Therefore, the development of underground traffic becomes a very feasible measure to solve the traffic pressure. In underground traffic engineering, shallow tunnel with small clear distance is a kind of tunnel type that is often encountered in traffic construction. However, shallow tunnel with small net distance is more complicated than ordinary tunnel. We should not only ensure tunnel safety, but also reduce the impact of tunnel construction on the surrounding environment. This paper takes the tunnel of Zhongliangshan 1# tunnel and south substation of Chongqing rail transit line 6 as the object of engineering support. The main research contents and theoretical results are as follows The main contents are as follows: 1. The mechanism of surface settlement caused by shallow excavation tunnel excavation is analyzed in detail. The influencing factors of surface settlement caused by tunnel excavation and the research status of forecasting surface settlement methods at home and abroad are expounded. 2. The basic construction mechanics principle and construction method of shallow buried parallel tunnel with small net distance are summarized systematically. The basic principle of finite element method and the meaning of discretization of finite element are introduced. The variation of surrounding rock stress field during tunnel excavation and how to simulate the excavation process by finite element method. 3. The stability and instability mechanism of tunnel surrounding rock are studied, and the yield criterion of weak face and the most unfavorable position of weak surface are also determined. (4) systematic division of tunnel depth and shallow burying, theoretical analysis of formation of surrounding rock loose pressure caused by tunnel construction, comparison of traditional calculation method and correction method of surrounding rock loose pressure. The stress and deformation of surrounding rock after tunnel excavation are analyzed and the damage forms of surface deformation caused by tunnel excavation are described briefly. 5. Through the design data to understand the construction characteristics of the tunnel of Zhongliangshan 1# Tunnel and the South Substation of Chongqing Rail Transit Line 6, under the premise of ensuring the safety of the tunnel construction, we must reduce the influence on the surrounding environment and control the condition of the buried depth of the tunnel. The two-dimensional finite element numerical simulation of the tunnel is carried out by using the large-scale finite-component software ANSYS. The results obtained from numerical simulation analysis are compared with each other in the aspects of surface settlement, stress and strain of tunnel structure, and internal force of lining support, and some basic laws are obtained from the analysis of calculation results. The results of this paper can provide design and construction suggestions for similar projects in the future.
【学位授予单位】：重庆交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U455.4

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