层状岩体开挖洞室围岩块体稳定分析及锚固方法

由于层状岩体的稳定性受层面控制,在该类岩体中进行开挖常常导致块体的失稳,给工程建设带来巨大的危害。本文从层面与结构面组合形成的块体系统稳定性分析入手,运用改进的块体理论,进行了块体稳定分析程序的开发,对定位、半定位块体的系统稳定性分析方法进行了探讨。以西龙池抽水蓄能电站地下厂房为例,对围岩中的块体进行了系统稳定分析。通过实际开挖验证,表明了分析结果的合理性,开发的程序可供同类工程参考使用。本文所提出的方法可为地下工程施工期的超前预报、围岩的系统锚固支护设计提供重要依据。

Stability analysis and anchor methods for blocks of underground layered rock mass in cavern excavation

The blocks of layered rock mass usually cause collapses in underground engineering since the stability of the block is controlled by the layers. Based on analyzing the stability of the block, which intersected by layers and joints, the improved block theory was discussed and the program was developed. Furthermore, the systematical stabilitis of the definite block and half definite block were studied, and the method discussed in this paper can be used to forecast the hazards and the anchorage designing in underground excavation. Finally, via the Improved Block Theory, the stability of wedges which formed by the layers and joints in Xilongchi underground power-station was calculated, the anchorage plan was determined,and the results could be reference for the similar excavation.