开挖扰动对断层上下盘围岩稳定性的影响研究

为研究采动应力对断层上下盘围岩稳定性的影响，采用相似模拟实验的方法，对开挖扰动作用下断层上下盘的围岩移动和破坏机制展开研究，结果表明：随开采工作的不断进行，断层在采动应力的影响下，位于断层下盘的围岩系统失稳垮落现象明显，基于覆层空间结构思想，对下盘围岩冒落规律展开分析，将断层下盘围岩冒落过程分为裂隙发育、覆层快速失稳、覆层逐渐稳定、覆层突变冒落四个阶段。相对于下盘围岩，上盘围岩位移变化微弱，应力增长显著，引入断层稳定性评估的应力比状态量，应力比计算值均在稳定区间内，上盘围岩系统保持稳定，受开挖扰动影响小。

Influence of excavation disturbance on stability of surrounding rock of upper and lower wall of fault

For the study of mining-induced stress impact on stability of surrounding rock of footwall fault, using the method of analog simulation test, fault under the action of the excavation disturbance on the footwall strata movement and failure mechanism study, the results show that: with the rapid growth of mining work, the fault under the influence of mining stress, located in the footwall of the surrounding rock caving system instability phenomenon obviously, based on the principles of overlying strata spatial structure, analyzes the footwall rock caving rule and the footwall rock caving process is divided into crack development, rapid instability of overburden, gradual stability of overburden and abrupt caving of overburden in four stages. Compared with footwall surrounding rock, the displacement change of hanging wall surrounding rock is weak and the stress increase is significant. The stress ratio state quantity of fault stability evaluation is introduced and the calculated value of stress ratio is within the stable range. The hanging wall surrounding rock system remains stable and is less affected by excavation disturbance.