【摘要】 根据冬瓜山深部硬岩开采岩石力学的前期实验研究结果,建立了弹塑性力学本构模型;采用正交实验方法设计计算方案,对影响围岩稳定性的内在物理力学参数(弹性模量E、泊松比μ、粘结力C、密度ρ以及内摩擦角φ)的灵敏度进行了有限元数值模拟分析。根据位移计算结果的正交统计分析,得出各参数对采场围岩稳定影响程度的大小。研究结果表明:弹性模量E的变化对采场稳定性的影响最明显,其次为泊松比μ,而内摩擦角φ与密度ρ的变化对采场稳定性的影响不明显;此外,E越大,岩体位移越小,μ和C与岩体位移的关系也具有相同的变化规律。更多还原

【Abstract】 Based on the former testing and research achievements of rock mechanics in Dongguashan deep brittle rock mining, the elastic-plastic constitutive model is constructed. With mathematical statistics method to design computer model and analyze the results of numerical simulation, the sensitivity of rock mass mechanics parameters(elastic modulus E, Poisson ratio μ, cohesive force C, density ρ and friction angle φ) influencing stope stability is studied. From the analysis of wall-rock displacement, the influencing degrees of these rock parameters on the stability of rock mass of stope are obtained. The results indicate that the change of E has the greatest influence on stope stability, the next is μ, meanwhile, both the change of φ and ρ is insensitive to the stope stability. Moreover, the bigger the modulus E is, the smaller the rock mass displacement is. The influence of μ and C on rock mass displacement is the same as E does.更多还原