【摘要】 震后山体结构破碎,崩塌频发,严重制约着灾后重建工作。从震后岩体实际结构状况出发,在分析诱发岩体崩塌的破坏性外力类型的基础上,借助断裂力学理论,通过合理建模,阐明了震后岩体崩塌的机理,给出了崩塌发生的条件,为可预知余震强度震区的危岩体诊断和排查提供了技术支持。最后通过算例分析表明:余震、降雨及其相互耦合作用是震后崩塌的根本动力;在特定外力下区内岩体裂缝发生扩展存在最小临界深度;外力耦合条件下裂缝失稳临界深度最小。更多还原

【Abstract】 Based on the real structure of rock and the analysis of destructive external force,and according to the fracture mechanics,the failure mechanism of dangerous rocks was studied by modeling reasonably.The condition of different kind’s collapses was given and proposed to diagnose dangerous rock.At last,an example was given to prove the theory.The result showed that the aftershock,rainfall and their coupling action are the main forces which cause the collapse after the event,and there is a critical minimum depth of crack under any action which can lead the failure.Meanwhile it was also found that the critical depth is smaller under couplings action.更多还原