乌东德水电站左岸地下厂房B类角砾岩区域稳定性分析
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摘要
乌东德水电站左右岸地下主厂房洞室群开挖中,出现A、B类角砾岩,对开挖结构面和裂隙的局部稳定性造成一定影响。为确保洞室群稳定,基于"快速反馈设计"理念,结合围岩监测资料、工程地质测绘成果,对照现场调研及非线性反演获得的厂址区三维地应力场所提供的初始应力条件,重点从数值仿真模拟方面,对围岩局部稳定性和支护结构受力问题进行实时快速反馈分析,对大的设计变更进行简略校核。采用校核后设计参数并将其应用于工程措施,通过监测数据印证支护施工实施的合理性及可靠性,为类似地下洞室工程的开挖支护提供参考依据。
Class A and class B breccia occur during excavation of underground main powerhouse grotto group on the left and right banks of Wudongde Hydropower Station,which affect the local stability of the excavation structure surface and cracks.Initial stress conditions obtained by site investigation and nonlinear inversion,and provided by site area 3D geostress places are compared in order to ensure stable cavities based on the "quick feedback design" concept in combination with the monitoring data of surrounding rock,engineering geological surveying and mapping results. Real-time quick feedback analysis is implemented on local stability of the surrounding rock and supporting structure stress problems mainly from the aspect of numerical simulation. Major design changes are briefly checked. Design parameters after check are adopted,and they are applied in engineering measures. The rationality and reliability of the implementation of support construction are verified by monitoring data,which provides reference basis for the excavation support of similar underground cavern projects.
Class A and class B breccia occur during excavation of underground main powerhouse grotto group on the left and right banks of Wudongde Hydropower Station,which affect the local stability of the excavation structure surface and cracks.Initial stress conditions obtained by site investigation and nonlinear inversion,and provided by site area 3D geostress places are compared in order to ensure stable cavities based on the "quick feedback design" concept in combination with the monitoring data of surrounding rock,engineering geological surveying and mapping results. Real-time quick feedback analysis is implemented on local stability of the surrounding rock and supporting structure stress problems mainly from the aspect of numerical simulation. Major design changes are briefly checked. Design parameters after check are adopted,and they are applied in engineering measures. The rationality and reliability of the implementation of support construction are verified by monitoring data,which provides reference basis for the excavation support of similar underground cavern projects.
引文
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