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基于地下岩体受节理面的控制,节理面的几何和力学参数随机分布,从而导致岩体系统具有高度不确定性,提出以关键块体理论为基础,考虑节理几何和力学参数随机性的岩体开挖可靠度分析方法,并给出了块体稳定的总失效概率评价模型。以澳大利亚阿德莱德地区一铜矿地质条件为例,以节理面倾角、倾向、摩擦系数和黏聚力为随机变量,通过Monte Carlo模拟和概率图方法,进行了岩体可靠度和失效概率的计算。最后,采用条件概率的分析方法,计算了单面滑动块体的总失效概率。计算结果表明,块体沿单面滑动并且出现的概率为11.0%,总的失效概率为3.85%,超过一般岩体工程可允许的风险水平,认为该方法可以作为评价块体可靠性的依据。
Based on the control of the surface rock mass by the control surface, the geometric and mechanical parameters of the joint surface are randomly distributed, which leads to the high uncertainty of the rock mass system. Based on the key block theory, the rock considering the randomness of the joint geometry and mechanical parameters Body excavation reliability analysis method, and gives the stability of the overall assessment of the total failure probability model. Taking the geological conditions of a copper mine in Adelaide, Australia as an example, the reliability and failure probability of rock mass were analyzed by means of Monte Carlo simulation and probability map with joint inclination, tendency, friction coefficient and cohesion as random variables Calculation. Finally, using the conditional probability analysis method, the total failure probability of one-sided sliding block is calculated. The calculation results show that the probability of block sliding along one side is 11.0% and the total failure probability is 3.85%, which exceeds the allowable risk level of general rock mass engineering. It is considered that this method can be used as the basis to evaluate the reliability of block.