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为研究开采扰动下断层滑移失稳诱发冲击矿压的致灾条件,基于“砌体梁”理论分析了开采过程中断层围岩系统的受力状态和力学响应.首先推导了断层面正应力、剪应力的计算公式,进而得到断层滑移失稳与覆岩“关键层”的破断和采场的推进的关系;利用数值模拟计算比较了不同开采影响因素下的断层面位移场、应力场、速度场和能量场的响应规律.结果表明:断层滑移对采动影响具有不同的敏感性,断层带上剪切位移和应力分布受断层摩擦角、采深、断层位置和回采方式等影响较大;而受断层力学性质(诸如法向刚度、切向刚度等)影响较小.受采动覆岩演化高度影响,断层带上不同位置处的应力路径变化较大,临近断层处易出现滑移.最大滑移速度和震源参数与最大剪切位移呈正相关关系.
In order to study the disaster conditions of rock burst induced by rockburst under mining disturbance, the stress state and mechanical response of the surrounding rock system during the mining process are analyzed based on the theory of “masonry beam” Stress and shear stress, and then get the relationship between the failure of fault slip and the breaking of “overburden” and the propulsion of stope. By using numerical simulation, the displacement field of fault plane under different mining influencing factors is compared and analyzed. , The stress field, the velocity field and the energy field.The results show that the fault slip has different sensitivity to mining and the shear displacement and stress distribution on the fault zone are affected by the fault friction angle, mining depth, fault location and recovery Mode and so on, and is less affected by the mechanical properties of the fault (such as normal stiffness and tangential stiffness, etc.). Due to the evolution height of the overburden strata, the stress paths at different positions of the fault belt vary greatly, Slippage occurs easily.The maximum slip velocity and source parameters are positively correlated with the maximum shear displacement.