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首先,在假定微元强度服从双参数Weibull分布的基础上,分析了围岩微元破坏概率和临界破坏概率,依据围岩完整程度不同,分析了巷道开挖后的围岩损伤;随后,运用岩石破裂过程分析软件RFPA,分别对不同均质度的巷道围岩开挖损伤进行了数值模拟分析。结果表明,伴随围岩均质度增加即围岩完整程度增加,围岩起始损伤延后,临界破坏概率越来越小;在围岩微元所受载荷达到其统计平均抗压强度前,围岩的均质度越低其巷道开挖后的围岩损伤值越大;在微元所受载荷达到统计平均抗压强度后,围岩均质度越高其巷道开挖后的围岩损伤值越大,其巷道开挖后的危险率越高,且往往具有突发性;巷道开挖后的围岩损伤破坏程度与围岩完整程度和抗压强度关系密切;分析结果与模拟结果是一致的。
First, based on the assumption that the strength of the micro-elements obeys the two-parameter Weibull distribution, the probability of micro-damage and the critical failure probability of the surrounding rock are analyzed. According to the different degree of surrounding rock, the damage of the surrounding rock after tunneling is analyzed. Rock burst process analysis software RFPA, respectively, to simulate the damage of tunnel excavation with different evenness. The results show that with the increase of the surrounding rock homogeneity, the completeness of the surrounding rock increases, the initial damage of the surrounding rock delaying and the probability of critical failure getting smaller and smaller. Before the load of the surrounding rock micro-element reaches its statistical average compressive strength, The lower the degree of homogenization of surrounding rock is, the larger the damage value of surrounding rock is. When the load of the element reaches the statistical average compressive strength, the higher the surrounding rock homogeneity is, The higher the damage value is, the higher the danger rate of the roadway after excavation is, and it is often sudden. The damage degree of the surrounding rock after tunneling is closely related to the completeness and compressive strength of the surrounding rock. The analysis results and simulation results Is consistent.