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岩体结构是地质年代形成和变动的结果。它反映了裂隙的密度并控制大型地下挖掘工程顶部岩体的力学性能。文章以溪洛渡水电站地下工程为例,根据断裂分布情况的研究对岩体进行分类。采用结构力学方法和UNWEDGE程序讨论了单个裂隙,成组裂隙和岩石碎块情况下顶部的稳定性来得到临界稳定厚度和可能失稳岩块的特点,可以为挖掘和支撑工作提供有益的指导。
Rock mass structure is the result of formation and change of geologic age. It reflects the density of fractures and controls the mechanical properties of the rock mass at the top of a large underground excavation. Taking Xiluodu Hydropower Station as an example, the paper classified the rock mass according to the study of fracture distribution. Structural dynamics and UNWEDGE procedures are used to discuss the top stability of a single fracture, a group of fractures and rock fragments to obtain the critical stable thickness and the characteristics of the rock mass which may be destabilized, which can provide useful guidance for digging and supporting work.