大断面黄土隧道双侧壁导坑法施工诱发地表沉降及隧道变形规律研究

发布时间：2018-01-21 07:20

本文关键词： 大断面黄土隧道双侧壁导坑法地表沉降变形规律数值模拟　出处：《城市轨道交通研究》2017年03期 　论文类型：期刊论文

【摘要】：以西安地铁3号线某区间双侧壁导坑法隧道工程为依托,采用FLAC3D模拟与现场实测相结合的方式,研究双侧壁导坑法施工引起的地表及隧道变形规律。研究结果表明:地表横向沉降曲线关于隧道中轴线对称分布,影响范围左右各30 m,可见,上导洞的开挖是造成地表沉降的主要原因;采用超前小导管注浆加固土体,有效控制了拱顶下沉;隧道开挖后两帮收敛值迅速增大,开挖面超前监测断面20m时收敛趋于稳定;模拟结果与实测数据吻合较好,说明FLAC3D数值模拟软件能有效预测地层变形。
[Abstract]:Based on the tunnel project of double-sidewall tunnel in a section of Xi'an Metro Line 3, the method of combining FLAC3D simulation with field measurement is adopted. This paper studies the deformation law of surface and tunnel caused by double-sidewall tunnel construction. The results show that the transverse settlement curve of surface is symmetrical distribution about the axis of tunnel, and the influence range is about 30 m, so it can be seen. The excavation of the upper guide tunnel is the main cause of the surface subsidence. The soil is strengthened by advanced small pipe grouting, which can effectively control the sinking of the arch roof. After the tunnel excavation, the convergence value of the two sides increases rapidly, and the convergence tends to be stable when the excavation face is in advance monitoring section 20m. The simulation results are in good agreement with the measured data, which indicates that the FLAC3D numerical simulation software can effectively predict the formation deformation.
【作者单位】：西安科技大学建筑与土木工程学院;
【分类号】：TU433;;U455.41+1
【正文快照】： 地铁隧道浅埋暗挖法施工时将不可避免的扰动原土体,造成围岩变形和地表沉降[1-2]。城市建筑物密集,严格控制隧道开挖造成的地表沉降等具有重要意义[3~4]。西安地处黄土地区,地铁3号线某区间为满足停车线等要求,其净空断面面积为69.7m2,属大断面隧道。国内学者对黄土地区隧道开

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