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中文摘要：
危险岩体失稳崩塌是震时地震诱发的最严重的地质灾害类型之一，严重地制约着灾区灾后重建工作。然而目前有关地震诱发岩体崩塌的力学机制还不清晰，不能很好地给出相关危岩的诊断和防治措施。为此，基于震区危岩体实际结构特征，借助岩石断裂力学知识，从能量角度研究震时震波能量在危岩体上的输入与耗散机制，分析岩体裂缝失稳扩展的条件和过程，并给出扩展量的计算方法，明晰地震诱发岩体崩塌的力学机制。最后通过算例计算和展示，验证模型的合理性，阐明震时崩塌本质上是震波作用下危岩体裂缝扩展贯通的结果。
英文摘要：
As one of the most serious secondary hazards induced by earthquake, the rock collapse aggravates the seismic damage and restricts the reconstruction greatly. However, there are less effective measures that can be used to diagnosis and treat it danger rocks just for its mechanism is not clear at present. Thus from the true structure of rock, based on the rock fracture mechanics, and taking energy method as a main way, the mechanism of input and dissipation of seismic energy on danger rocks is studied. Then by analyzing the condition and process of crack propagation, the instability mechanism of dangerous rock caused by seismic wave is studied clearly. Furthermore, the calculation formula for critical acceleration and propagation length are also suggested. At last, an example is given to prove the theory. The result shows the cracks on danger rock can propagate and develop under enough big seismic action, which result in the failure of danger rock and the collapse occasion at last.
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