城市隧道施工影响下地下管线变形破坏特点及渗漏水影响机理

发布时间：2018-04-21 06:12

本文选题：地铁 + 隧道　；参考：《北京交通大学》2017年硕士论文

【摘要】：随着我国经济社会的持续快速发展,我国城镇化进程的加快推进,各大城市都已开通运营地下轨道交通系统,不少中型城市也已将建设轨道交通列入发展规划。然而在城市轨道交通系统服务区域经济发展、提高生活品质的同时,频繁发生的地铁隧道施工事故也一次又一次给社会经济造成严重损失,威胁到了社会公众的安全,动摇公众对地下轨道交通系统的期待和信心。城市地层中埋藏着许多管线,地铁隧道施工会不可避免地引起周围地层的扰动,导致埋设在地层中的管线发生变形甚至破坏。对于地下管线,在隧道施工之前及施工过程当中如何准确预测这些管线的变形规律及变形量、准确判断管线状态对于施工安全至关重要;对于隧道施工,如何准确判断地下管线的渗漏水对地层造成的影响、预测管线渗漏造成的地层影响范围,进而提高隧道施工安全性。针对这些问题,本文主要工作及研究成果如下:1.利用Midas-NX数值模拟软件以及FLAC3D有限差分软件,根据隧道与地下管线的三种空间位置关系(管-隧垂直、管-隧平行、管-隧斜交),研究了在不同空间位置关系的情况下隧道施工对地下管线的影响规律,得出了隧道以0°角穿越地下管线为最有利穿越角度的结论。2.利用Midas-NX数值模拟软件以及FLAC3D有限差分软件,研究了与地下管线沉降变形相关的因素,如管线材质、管线强度、衬砌强度、管-隧间距、管-隧夹角、刀盘推力等因素的影响规律。3.利用Geo-Studio渗流分析软件,研究了地下管线在隧道施工扰动发生渗漏水的情况下,管线内压力、管-隧相对位置以及管线破裂程度这三个因素对渗漏水在地层中产生渗流场的影响规律。4.以京广桥地铁隧道施工事故案例为背景,综合利用Geo-Studio、Midas-NX以及FLAC3D软件对事故演化过程进行了全过程数值模拟分析,结果显示该事故的发展演化过程为存在初始渗漏的污水管线在隧道施工扰动下发生变形破坏而最终导致隧道涌水以及地层塌陷,地下管线渗漏水是影响隧道施工安全的重要因素。
[Abstract]:With the sustained and rapid development of our country's economy and society and the acceleration of urbanization in our country, the underground rail transit system has been opened in all major cities, and many medium-sized cities have also included the construction of rail transit in the development plan. However, while the urban rail transit system serves the development of regional economy and improves the quality of life, the frequent subway tunnel construction accidents have caused serious losses to the social economy again and again, threatening the safety of the public. Shake the public's expectations and confidence in the underground rail transit system. There are many pipelines buried in the urban strata, the subway tunnel construction will inevitably cause the disturbance of the surrounding strata, resulting in the pipeline buried in the formation deformation or even destruction. For underground pipelines, how to accurately predict the deformation law and deformation amount of these pipelines before and during the tunnel construction, and how to accurately judge the pipeline state is very important to the safety of construction. How to accurately judge the influence of underground pipeline leakage on formation, predict the formation influence range caused by pipeline leakage, and then improve the safety of tunnel construction. In view of these problems, the main work and research results of this paper are as follows: 1. By using Midas-NX numerical simulation software and FLAC3D finite difference software, according to the three spatial position relationships between tunnel and underground pipeline (pipe-tunnel vertical, pipe-tunnel parallelism), In this paper, the influence of tunnel construction on underground pipeline under the condition of different spatial position relationship is studied, and the conclusion that tunnel crossing underground pipeline at 0 掳angle is the most favorable crossing angle is obtained. By using Midas-NX numerical simulation software and FLAC3D finite difference software, the factors related to the settlement and deformation of underground pipeline, such as pipeline material, pipeline strength, lining strength, pipe-tunnel spacing, and the angle between pipe and tunnel, are studied. The influence law of the factors such as the thrust of the cutter head. 3. Using Geo-Studio seepage analysis software, the pressure of underground pipeline in the case of seepage occurred in tunnel construction disturbance is studied. The influence of the relative position of pipe and tunnel and the degree of pipeline rupture on the seepage field of seepage water in the formation. Based on the case of Beijing-Guangqiao subway tunnel construction accident, the whole process of the accident evolution was simulated and analyzed by using Geo-Studio Midas-NX and FLAC3D software. The results show that the evolution process of the accident is that the sewage pipeline with initial leakage will be deformed and destroyed under the disturbance of tunnel construction, which will eventually lead to tunnel water gushing and stratum collapse. Underground pipeline leakage is an important factor affecting the safety of tunnel construction.
【学位授予单位】：北京交通大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U456.3;TU990.3

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