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陡崖或陡坡下岩性差异风化形成的岩腔是危岩崩落的起因。群发性破坏机理必须考虑危岩体之间的相互作用。基于危岩块相互作用力学机制,采用危岩块转动角度来衡量危岩体之间的相互作用,计算出不考虑相互作用(含等效)时危岩体的转动角度,运用能量守恒原理得到各危岩体相互作用后的实际转动角度,由转动角度建立了各危岩体的等效弯矩计算式。基于断裂力学和损伤力学建立了危岩体崩落时间的计算方法,并通过计算实例初步验证了该方法的有效性。
Rock cavities formed by weathering differences between cliffs and steep slopes are the cause of dangerous rockfall. The mechanism of mass destruction must take into account the interaction between dangerous rock mass. Based on the mechanics of interaction of dangerous rock blocks, the interaction between the dangerous rock masses is measured by the turning angle of the dangerous rock blocks, and the rotation angle of the dangerous rock mass is calculated without considering the interaction (including equivalent). The energy conservation principle is used to obtain The actual rotation angle of each dangerous rock body interaction, established by the rotation angle of the dangerous rock body equivalent bending moment formula. Based on fracture mechanics and damage mechanics, a method to calculate the collapse time of dangerous rock mass is established. The calculation example proves the effectiveness of the method.