孤岛型边角煤柱工作面反弧形覆岩结构诱冲机理及其控制

为有效控制边角煤柱回收过程的冲击矿压灾害,根据三侧采空的孤岛型边角煤柱特点,采用理论分析和数值模拟方法,分析了上覆岩层结构特征及诱冲机理及其控制措施.研究得出：三侧采空的孤岛型边角煤柱工作面具有“T”形与“Γ" 形结构组成的反弧形覆岩结构,该结构使煤柱形成一环绕工作面的反弧形高应力和弹性能积聚区;回采过程中,“Γ" 形悬顶的周期性运动导致反弧形覆岩结构处于动态变化过程,动静应力综合作用对煤体稳定状态造成影响,是诱发冲击矿压的主要原因;提出了对沿空巷道实体煤侧实施卸压弱化、对窄煤柱侧实施支护强化的非对称控制对策,降低反弧形覆岩结构的影响,控制冲击危险。

The anti-arc overlying strata structure induced mechanism and control of isolated corner coal pillar working face

In order to effectively control rock burst disaster due to the process of corner coal pillar recovery,it is available to use the theoretical analysis and numerical simulation to analyze the overburden structural characteristics and induced mechanism and control measures depending on characteristics of isolated coal pillar with trilateral gob.It shows that isolated corner coal pillar working face with trilateral gob has anti-arc overlying rock structure composed of "T" and "г" structure,which can make the coal pillar form an anti-arc high stress and elastic energy accumulation district around the working face;the main reason which induced rock burst is that the cyclical movement of "г" structure leads to the anti-arc overlying rock structure being in the dynamic process and the comprehensive role of the static and dynamic stress affect the steady state of the coal body in the process of recovery.This paper puts forward the non-symmetric control countermeasures weakening the implementation of relief along the coal side of roadway and strengthening support to narrow coal pillar side,to reduce the impact of anti-arc structure of overlying strata and control the impact of risk.