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鉴于地应力对地下工程围岩稳定性的重要影响,以深埋软岩隧道为背景,在现场地应力测试基础上,利用FLAC3D数值模拟软件分析隧道开挖围岩应力、位移、塑性区分布规律及稳定性。结果表明,隧道埋深较小时,最大主应力为16.81~16.83MPa,属中等地应力区,方向为N30°~36°W,与隧道轴线夹角较小;埋深较大时,最大主应力为27.56~31.22 MPa,属高地应力区,方向基本偏转90°,与隧道轴线夹角较大。隧道开挖应力最大为50 MPa、变形量峰值为36.88mm、塑性区最大深度为3.3 m,围岩整体稳定性差。现场变形量、松动圈及破坏特征监测结果验证了数模结果的合理性。研究成果可为类似工程提供参考。
In view of the important influence of in-situ stress on the stability of surrounding rock in underground engineering, based on the in-situ stress test, FLAC3D numerical simulation software is used to analyze the stress, displacement and distribution of plastic zone in surrounding rock of tunnel excavation. And stability. The results show that the maximum principal stress is 16.81 ~ 16.83 MPa when the depth of tunnel is small, which is moderately stress zone with the direction of N30 ° ~ 36 ° W, and the smaller the angle with the tunnel axis. When the depth is larger, the maximum principal stress Is 27.56 ~ 31.22 MPa, belonging to the high stress area, the direction of the basic deflection 90 °, with the larger angle between the tunnel axis. The maximum stress of tunnel excavation is 50 MPa, the peak of deformation is 36.88 mm, the maximum depth of plastic zone is 3.3 m, and the overall stability of surrounding rock is poor. The on-site deformation, loose ring and failure characteristics monitoring results verify the rationality of numerical results. The research results can provide reference for similar projects.