既有隧道车站影响下隧道施工引起的地表沉降研究

发布时间：2018-06-21 00:30

本文选题：地表沉降 + 既有隧道车站　；参考：《湖南科技大学》2014年硕士论文

【摘要】：随着城市地铁隧道的发展，地铁的网络化已经不可避免，新建隧道穿越既有隧道的情况将会越来越多，在这样的穿越工程中，新建隧道的开挖必然会导致地表的沉降，但是由于既有隧道结构的存在，，其相互作用关系极为复杂，这样的地表沉降将不同于天然的地表沉降。而隧道对于周边环境的主要影响表现在地表沉降上面，如何能正确的预测这类工程的地表沉降将会对此类工程有较大意义。本文以武汉地铁6号线下穿2号线常青花园工程为背景，通过理论分析、数值模拟以及现场监测实验对既有隧道车站影响下，新建隧道开挖引起的地表沉降进行了分析，得出了如下结论：（1）分析了地层沉降机理，并且结合本文工程实际，对本文情况进行简化，结合Verruijt和Booker解，能够得出符合工程现场实际情况的竖直位移计算公式。（2）采用精密水准仪对现场的施工沉降情况进行实时监控，对现场量测数据进行分析，得出沉降规律。（3）运用FLAC软件对于本工程的施工沉降进行模拟，数值模拟的最大位移比实测位移值小了6.70mm，减小了10.3%，虽然比实际情况略小，但是能正确的反应整体变化趋势。同时运用FLAC对既有隧道车站不同刚度、新建隧道不同埋深以及有、无既有隧道车站进行模拟分析，结合理论计算公式进行对比，发现既有隧道刚度和施工支护情况对地表沉降有较大影响，且由于本工程中既有隧道属于超浅埋情况下，既有隧道对于地表沉降的影响范围是限定在既有隧道本身的尺寸范围之类的，对于其他位置的影响情况有限。
[Abstract]:With the development of urban subway tunnel, the subway network is inevitable, the new tunnel will pass through the existing tunnel more and more, in such a crossing project, the excavation of the new tunnel will inevitably lead to the settlement of the surface. However, due to the existence of the existing tunnel structure, the interaction relationship is very complex, such surface subsidence will be different from the natural surface subsidence. The main impact of tunnel on the surrounding environment is the surface subsidence. How to correctly predict the surface settlement of this kind of project will be of great significance to this kind of project. Based on the Changqing Garden Project of Wuhan Metro Line 6 and Line 2, the ground subsidence caused by the excavation of the new tunnel is analyzed by theoretical analysis, numerical simulation and field monitoring experiment. The conclusions are as follows: (1) the mechanism of ground subsidence is analyzed, and the situation of this paper is simplified, combined with Verruijt and Booker solution, combined with the engineering practice in this paper. The calculation formula of vertical displacement in accordance with the actual situation of engineering site can be obtained. The precision level is used to monitor the construction settlement in real time, and the field measurement data are analyzed. The results show that the maximum displacement of the numerical simulation is 6.70 mm smaller than the measured displacement value, which decreases 10.3%, although it is a little smaller than the actual situation, by using FLAC software to simulate the construction settlement of the project. But can correctly reflect the overall trend of change. At the same time, FLAC is used to simulate the different stiffness of the existing tunnel station, the different buried depth of the new tunnel and the station without the existing tunnel, and the comparison is made with the theoretical calculation formula. It is found that the stiffness of the existing tunnel and the condition of the construction support have great influence on the surface settlement, and because the existing tunnel in this project belongs to the condition of super shallow burial, The influence range of the existing tunnel on the surface settlement is limited to the size range of the existing tunnel itself, but the influence on other positions is limited.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U456.3

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