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杨房沟水电站地下洞室施工期围岩稳定性分析

杜鑫,陈斌,章环境,李俊,魏宝龙,杨田   

  • 出版日期:2018-12-28 发布日期:2018-12-28

Analysis on surrounding rock mass stability during construction of underground powerhouse of Yangfanggou Hydropower Station

DU Xin, CHEN Bin, ZHANG Huanjing, LI Jun, WEI Baolong, YANG Tian   

  • Online:2018-12-28 Published:2018-12-28

摘要: 地下厂房洞室群具有规模大、结构复杂、交叉开挖率高等特点,施工期围岩稳定性控制难度大,而做好施工期监测资料分析和围岩稳定性评价,则是保障地下厂房洞室围岩稳定的重要措施。从监测内容、监测方法以及分析思路的角度出发,对位移和应力量级、应力分布特征、应力变化规律及其影响因素进行了分析;在此基础上,对地下厂房施工期围岩的稳定性进行了评价。评价结果表明:① 围岩最大位移为65.58 mm,锚杆应力绝大多数在200 MPa以内,围岩松弛变形程度处于中等水平,围岩松动圈基本上在3 m以内,支护参数合理有效;② 围岩位移和支护设施的应力量级可控、分布合理、变化规律正常,施工期地下厂房围岩整体处于稳定状态。杨房沟水电站地下厂房监测资料的分析结果和对围岩稳定性的评价结果,可供类似工程借鉴与参考。

关键词: 地下厂房, 地下洞室, 地下洞室施工, 安全监测, 围岩稳定性, 稳定性分析, 杨房沟水电站

Abstract: Underground powerhouse caverns have the characteristics of large scale, complex structure and high probability of cross-excavation and etc, and it is difficult to control its stability during the excavation. Monitoring data analysis and stability evaluation of surrounding rock mass are important measures for ensuring the stability of surrounding rock mass in the caverns. We evaluated the surrounding rock mass stability by analyzing its displacement, stress magnitude, stress distribution characteristics, variation law and its influence factors from the perspectives of monitoring content, methods and analyzing approach. The results show that surrounding rock is in moderate relaxation and deformation with maximum displacement of 65.58 millimeters and force of most rock bolts within 200 MPa; its lengths of loosen circle radius are basically within three meters, showing that supporting parameters are credible and effective. The rock mass displacement is distributed reasonably in the normal variation state and stress magnitudes of supporting facilities are controllable. Generally, surrounding rock mass in underground caverns is rather stable.

Key words: underground powerhouse, underground caverns, underground caverns construction, safety monitoring, rock mass stability, stability analysis, Yangfanggou Hydropower Station