裂隙化硬岩洞室围岩稳定概率分析方法

Probability analysis for stability of underground cave surrounding rock in fissured rock-mass

在较坚硬的裂隙化岩体中,地下洞室围岩的稳定性决定于岩体的失稳机理和天然的随机因素。本文以块体理论为基础,考虑岩体结构面几何参数和力学参数的随机性,研究了块裂岩体地下结构围岩稳定随机分析方法,并认为结构几何特征的随机性控制关键块体的生成概率,力学参数的随机性控制关键块体在力学上的实现概率,裂缝化岩体地下洞室围岩的失稳可能性是两者的并联事件。根据文献资料,作了一实际算例。

The stability of surrounding rock of underground structure in hard rock-mass depends on both failure mechanism and natural random factors of rock-mass.Based on the block theory, the stochastic analysis method for stability of underground structure surrounding rock in fissured rock mass is established. In the method the geographic parameters of structural surface in rock-mass and randomness of mechanical parameters of rock are taken into account. It is found that the generation probability of the critical block is controlled by the randomness of structural characteristics and the probability of mechanical failure occurrence is controlled by the randomness of mechanical parameters. The failure probability of fissured surround rock is a parallel probability event both influenced by the randomness of structural characteristics and randomness of mechanical parameters. An example is given for demonstration.