本文利用离散元软件UDEC建立多个块状危岩群体的模型,通过破坏群体最顶角的块体进行竖横向位移检测,重点研究危岩块度、危岩高度、节理倾角、外力振动强度等4个因素对崩塌时间的影响,从而说明各个因素的改变对崩塌的影响情况;对应着个体倾倒角,取横向位移与竖向位移比值,定义为位移角,以位移角变化率为判定是否出现崩塌的依据,同时观察不同情况下崩塌破坏位移角的取值,得到块状危岩崩塌破坏的位移角临界值范围在10°~15°的结论.%This paper establish some models of the blocky perilous rocks by using the discrete element software UDEC.By testing the vertical and horizontal displacements of a block which is located on the angle of the model, the studied on the influence to the failure time of the main four elements that are the lumpiness,height,joint angle and external vibration strength are conducted.The influence of the four big elements on the collapse were summarized.For the individual flip angle, we take the ratio of vertical displacement and horizontal displacement as the displacement angle, and make a decision if it happened the collapse by the change rate of the displacement angle, in the meantime, observe the displacement angle's value when the collapse happened and got the displacement angle's critical value of the blocky perilous rocks which are between 10° and 15°.
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