城市隧道施工引发的地表沉陷机理研究

发布时间：2018-06-06 17:18

本文选题：城市隧道 + 地表沉陷　；参考：《中国矿业大学》2014年硕士论文

【摘要】：城市隧道施工会不可避免地引发一定程度的地表沉陷，，严重的地表沉陷事故会对人们的生命和财产安全造成严重威胁，于是隧道施工引发的地表沉陷机理问题越来越受到人们的关注。同时，随着地铁建设的快速发展，城市隧道施工引发的地表沉陷事故越来越频繁，故对城市隧道施工引发的地表沉陷机理进行研究具有重要的学术价值和现实意义。本文采用理论分析、数值模拟、工程实例相结合的手段，从压力拱角度研究了城市隧道施工引发的地表沉陷机理，主要进行了以下研究工作：（1）对隧道施工引发的地表沉陷全过程进行了UDEC离散元数值模拟，得到地表沉陷全过程中压力拱内边界外移的规律：若压力拱内边界不断外移至地表附近，则引起地表整体塌陷；若压力拱内边界外移一定程度后停止外移，则地表仅出现一定程度的沉陷。（2）对隧道施工引发地表沉陷的相关因素进行正交试验分析，结果显示围岩条件对地表沉陷值及地表沉陷区宽度的影响最大，节理间距对隧道塌方面积的影响最为显著。（3）研究了锚杆支护、锚喷支护以及复合式衬砌支护对地表沉陷的影响，得到各种支护能不同程度限制岩土体中压力拱内边界的外移，从而减小地表沉陷的结论。（4）研究了全断面法和台阶法施工对地表沉陷的影响，得到台阶法施工能有效限制岩土体中压力拱内边界的外移，从而减小地表沉陷的结论。（5）结合某工程实例进行对比验证。结果表明：数值模拟得到的规律和结果与现场实测基本一致。
[Abstract]:Urban tunnel construction will inevitably lead to a certain degree of surface subsidence, serious surface subsidence accidents will pose a serious threat to people's lives and property safety. Therefore, people pay more and more attention to the surface subsidence mechanism caused by tunnel construction. At the same time, with the rapid development of subway construction, ground subsidence accidents caused by urban tunnel construction are more and more frequent. Therefore, it is of great academic value and practical significance to study the mechanism of surface subsidence caused by urban tunnel construction. The mechanism of surface subsidence induced by urban tunnel construction is studied from the angle of pressure arch. The main research work is as follows: 1) the UDEC discrete element numerical simulation of the whole process of surface subsidence caused by tunnel construction is carried out. The law of the internal boundary migration of the pressure arch during the whole process of surface subsidence is obtained: if the inner boundary of the pressure arch moves continuously to the vicinity of the surface, the whole surface collapses will be caused, and if the internal boundary of the pressure arch moves out to a certain extent, the external movement will be stopped. The results show that the surrounding rock condition has the greatest influence on the surface subsidence value and the width of the surface subsidence area, and the results show that the surrounding rock condition has the greatest influence on the surface subsidence value and the width of the surface subsidence zone, and the results show that the surrounding rock condition has the greatest influence on the surface subsidence value and the width of the surface subsidence zone. The influence of joint spacing on the area of tunnel collapse is most significant. (3) the influence of bolt support, bolt shotcrete support and composite lining support on surface subsidence is studied. It is concluded that various types of support can limit the internal boundary of pressure arch in rock and soil to some extent. In order to reduce the surface subsidence, the paper studies the influence of the full-section method and the step method construction on the surface subsidence, and concludes that the step method construction can effectively limit the external movement of the inner boundary of the pressure arch in the rock and soil. Therefore, the conclusion of reducing the surface subsidence is concluded. The results show that the laws and results obtained by numerical simulation are in good agreement with the field measurements.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU433;U455

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