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在由坚硬岩石构成的岩体中,岩石的裂隙性对矿山坑道的稳定有决定性的影响。岩体被其生成和存在过程中形成的裂隙系统分割破裂,导致产生岩体结构的弱化效应,它表现为裂隙岩体的强度低于岩石试样的强度。裂隙构成现有弱面的总体,通常沿这弱面发生岩体破坏。所以在坚硬岩石中的结构弱化比尺寸效应(随着试样体积增大,其强度降低)占优势,尺寸效应在评价矿山工程
In rock masses composed of hard rock, the fracture of the rock has a decisive influence on the stability of the mine tunnel. The rock mass is fragmented and fractured by the fracture system formed during its formation and existence, which leads to the weakening effect of the rock mass structure. It shows that the strength of the fractured rock mass is lower than that of the rock sample. Fissures constitute the totality of the existing weak faces, and rock mass destruction usually occurs along this weak face. Therefore, the structural weakness in hard rocks is more dominant than the size effect (which decreases in strength as the sample volume increases)