基于实测地应力的丹巴水电站深埋软岩引水隧道变形破坏规律及稳定性研究
发布时间：2018-08-26 07:59
【摘要】：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。
[Abstract]:In view of the important influence of in-situ stress on the stability of surrounding rock in underground engineering, the stress and displacement of surrounding rock in tunnel excavation are analyzed by using FLAC3D numerical simulation software on the basis of in-situ stress test. Distribution and stability of plastic zone. The results show that the maximum principal stress of the tunnel is 16.81 脳 16.83MPa, which belongs to the medium ground stress area, and the direction is N30 掳/ 36 掳W, and the angle between the tunnel axis and the tunnel axis is small, and the maximum principal stress of 27.560.31.22 MPa, belongs to the high ground stress area when the buried depth is large. The direction basically deflects 90 掳, and the angle with the tunnel axis is bigger. The maximum stress of tunnel excavation is 36.88 mm for 50 MPa, deformation and the maximum depth of plastic zone is 3.3 mm. The overall stability of surrounding rock is poor. The monitoring results of field deformation, loose ring and failure characteristics verify the rationality of the numerical simulation results. The research results can provide reference for similar projects.
【作者单位】： 山西交通职业技术学院工程管理系;
【分类号】：TV554
本文编号：2204228
[Abstract]:In view of the important influence of in-situ stress on the stability of surrounding rock in underground engineering, the stress and displacement of surrounding rock in tunnel excavation are analyzed by using FLAC3D numerical simulation software on the basis of in-situ stress test. Distribution and stability of plastic zone. The results show that the maximum principal stress of the tunnel is 16.81 脳 16.83MPa, which belongs to the medium ground stress area, and the direction is N30 掳/ 36 掳W, and the angle between the tunnel axis and the tunnel axis is small, and the maximum principal stress of 27.560.31.22 MPa, belongs to the high ground stress area when the buried depth is large. The direction basically deflects 90 掳, and the angle with the tunnel axis is bigger. The maximum stress of tunnel excavation is 36.88 mm for 50 MPa, deformation and the maximum depth of plastic zone is 3.3 mm. The overall stability of surrounding rock is poor. The monitoring results of field deformation, loose ring and failure characteristics verify the rationality of the numerical simulation results. The research results can provide reference for similar projects.
【作者单位】： 山西交通职业技术学院工程管理系;
【分类号】：TV554
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