邻近既有深基坑的盾构法隧道施工地层变位分析

发布时间：2018-02-03 11:50

本文关键词： 盾构隧道深基坑三维数值分析地层变位　出处：《现代隧道技术》2017年02期 　论文类型：期刊论文

【摘要】：文章针对盾构隧道邻近深基坑推进的工况,进行室内缩尺模型试验,并建立了对应工况下的盾构隧道-土体-基坑围护结构三部分共同作用的三维有限元计算模型。通过对比同一工况下的室内模型试验和数值计算结果,验证了三维数值分析的可行性和可靠性;得到了邻近既有深基坑的盾构法隧道施工引起周边地表沉降的分布特点及其变化规律;分析了盾构隧道开挖引起的横断面不同深度处地层位移的特点;分析了隧道上方的地表沉降分布受邻近既有基坑的影响及沉降值随盾构隧道推进进度的变化规律,得到了盾构隧道对基坑围护结构的位移影响情况;并提出了盾构隧道施工过程中对周边地表沉降、地层变位及基坑围护结构位移与变形进行实时监测的建议。
[Abstract]:Aiming at the driving condition of the shield tunnel adjacent to the deep foundation pit, the indoor scale model test is carried out in this paper. A three-dimensional finite element model of shield tunnel-soil-foundation pit enclosure structure under corresponding working conditions is established, and the results of indoor model test and numerical calculation under the same working condition are compared. The feasibility and reliability of 3D numerical analysis are verified. The distribution characteristics and variation law of ground surface settlement caused by shield tunneling adjacent to existing deep foundation pit are obtained. The characteristics of stratum displacement at different depth of cross section caused by shield tunnel excavation are analyzed. The surface settlement distribution above the tunnel is affected by the adjacent existing foundation pit and the variation law of settlement value with the advance progress of shield tunnel is analyzed. The influence of shield tunnel on the displacement of foundation pit enclosure structure is obtained. The paper also puts forward some suggestions for real-time monitoring of ground subsidence, ground displacement and displacement and deformation of foundation pit enclosure during shield tunnel construction.
【作者单位】：上海海洋地质勘察设计有限公司;苏州科技学院土木工程学院;苏州相城区建设工程质量监督站;
【基金】：住房与城乡建设部科学技术项目(2012-K3-25)
【分类号】：U455.43
【正文快照】： 3苏州相城区建设工程质量监督站,苏州215131)修改稿返回日期:2015-01-221引言地铁因其方便快捷而在各大城市得到迅速发展,逐渐成为大城市的交通命脉。在城市地铁的建设过程中,受既有建(构)筑物的限制,在建隧道近距离穿越建筑物基础或地下室的情况逐渐增多,且地铁线路多条交叉

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