不同宽度岩桥节理岩体直剪试验研究

摘要

D irect shear test w as applied in this paper to study failure characteristics,strength param eters and shear strength of rock mass with different width rock bridge joints. T he results show that the shear strength depends on rock bridge. As its w idth increases,shear failure gradually exists in a larger zone,creating shear plates. W hen the w idth of rock bridge gets narrow er,the control factor affecting shear strength transfers from cohesion to internal friction angle.%通过室内常规直剪试验研究了不同宽度岩桥节理岩体的破坏特性和抗剪强度的变化规律。结果表明：节理岩体的抗剪强度主要由岩桥提供；随着岩桥由窄向宽变化，破坏方式由剪断破坏到大范围的剪切破坏，形成具有一定角度的剪切面；在岩桥由宽变窄的过程中，对岩石抗剪强度起主导作用的强度参数由黏聚力变为了内摩擦角。