基于半定位块体统计分析的地下洞室不稳定区域识别研究

Study on Identification of Unstable Area of Underground Caverns Based on Statistical Analysis of Half Definite Blocks

针对节理组产状不确定性导致的岩石块体稳定性问题,采用正交设计方法对节理组产状进行多方案设计,通过使用定位断层为主轴的半定位块体统计分析方法,对某抽水蓄能电站洞室开挖不稳定区域进行识别。结果表明,该方法在充分考虑节理面产状不确定性的基础上,有效、快速地识别出半定位块体出现的集中区域,初步判断地下厂房施工时变形与破坏的主要危险区域;通过对半定位块体的体积、埋深、安全系数等的统计分析,有效识别出对工程安全影响较为显著的块体及其出现区域;通过将半定位块体的计算结果与实际开挖块体进行对比,快速识别了主要控制断层和潜在危险区域,分析了支护方案的加固效果,指出了可能需要加强支护的区域。

For the instability of rock blocks caused by structural planes with uncertain spatial occurrence in under-ground caverns,a fault-based statistical analysis method was proposed.By using the proposed method,the statistical law of the half definite blocks of a pumped storage power station was studied.The results show that the block-concentrated zones and the large deformed zones caused by the excavation disturbance can be effectively and quickly identified with con-sideration of the uncertain occurrence of the structural planes;By analyzing the volume,burial depth and safety factor of the half definite blocks,the blocks that have a significant impact on the safety of the underground caverns can be effec-tively identified;By comparing the calculation results with the practice.the main control faults and potential danger zones have been quickly identified.and the zones needing to be strengthened are proposed by analyzing the reinforcement effect of the support structures.