上覆遗留煤柱区冲击地压综合防控技术

Comprehensive Prevention Technology of Rock Burst in Overlying Retained Coal Pillar Area

为防止南山煤矿18~#煤层北三段工作面穿越上覆遗留煤柱区时发生冲击地压灾害,基于应力来源和表现形式,分析了冲击地压致灾力源因素,制定了静载荷卸压降载-动载荷减震消能的分源防控措施。实践表明,近距离遗留煤柱区动、静力源相互叠加,冲击危险性高,基于冲击力源分源防治思想,采用综放开采、爆破卸压降低巷道围岩静载荷水平,顶板爆破预裂、煤柱水力压裂降低动载荷扰动,巷道补强支护增强围岩抗冲能力,保证了巷道围岩处于低应力,微震能量以低能级、多频次形式释放,降低冲击显现程度,有效避免了遗留煤柱区冲击地压的发生。

To prevent the rock burst disaster when the northern 3~#section of No.18 coal seam crossed the overlying retained pillar area in Nanshan Coal Mine,based on the stress source and manifestation of stress,the factors causing the rock burst disaster were analyzed,the prevention measures including static partial pressure relief and dynamic load shock absorption and energy dissipation were formulated.Practice showed that the dynamic and static force superposed in the overlying retained pillar area,and the impact risk was high.Based on the thought of separate source prevention,the static load level of the surrounding rock of the roadway was reduced by fully mechanized caving mining and blasting pressure relief,the dynamic load disturbance was reduced by roof blasting pre-splitting and coal pillar hydraulic fracturing,and support reinforcement of full roadway section was designed to improve the anti-outburst ability,which ensured that the surrounding rock of the roadway was in low stress,and the micro-seismic energy was released in the form of low energy level and multi-frequency.It effectively avoided the occurrence of rock burst.