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以正断层赋存条件下厚煤层开采为研究背景,采用FLAC3D数值模拟,研究了上、下盘工作面分别向正断层推进时支承应力演化规律,揭示了工作面向正断层开采的致灾规律。研究表明:断层带切割了顶底板岩层的完整性,采动应力的阻隔效应显著,致使断层煤柱易形成较高的应力集中区;下盘向正断层推进时,存在支承应力突增点,使断层煤柱发生塑性破坏,释放大量弹性能;上盘向正断层推进时,支承应力平缓增加,且推进过程中部分应力能够向下盘转移,在下盘形成较小应力集中区,应力曲线呈现一大一小“双驼峰”状。
Taking the mining of thick coal seams under normal faulting as the research background, the FLAC3D numerical simulation is used to study the stress evolution of the upper and lower bearing face when the normal fault is propped forward, and the disaster-causing regularity of the working face towards the normal fault is revealed. The results show that the fault zone cuts the integrity of top and bottom rock strata, and the obstruction effect of mining stress is significant, resulting in the formation of high stress concentration zones in fault pillars. When the bottom plate moves forward, there is a sudden increase in bearing stress, So that the pillars of the fault pillage will be damaged by plasticity and a large amount of elastic energy will be released. When the plate advancing to the normal fault, the bearing stress increases gently, and some of the stress can be transferred to the lower plate during the advancing process, and the stress concentration curve appears in the lower plate One big and one small “double hump ” shape.