基于地震波CT探测的冲击地压危险性评价与防治

Risk assessment and prevention of rock burst based on seismic wave CT detection

为了解决工作面回采过程中存在的冲击危险区域的不确定性和煤岩体内部静载荷分布的模糊性,采用地震波CT探测技术,对回采工作面采取静载荷探测和冲击危险性评估,对冲击危险区域进行了重新确定,并制定了有针对性的卸压方案,提高了工作面回采期间的冲击地压防治效果。结果表明,小庄煤矿40302工作面回采期间,发现中等危险区域共9处,弱危险区域14处,其他区域为无冲击危险区域。通过采用地面L型水平井分段压裂技术、煤层大直径卸压钻孔、煤层爆破及顶板预裂爆破技术对冲击危险区域进行卸压,有效降低了工作面回采期间的冲击风险,为工作面安全回采提供了保障。

In order to solve the uncertainty of the impact danger area existing in the mining process of the working face and the fuzziness of the static load distribution inside the coal and rock mass,this paper adopts the seismic wave CT detection technology,carries out impact risk assessment on the mining face,re-determines the impact danger area,and makes a targeted pressure relief plan.The prevention and control effect of rock burst during mining is improved.The results show that during the mining period of Xiaozhuang Mine 40302 face,there are 9 moderate danger areas,14 weak danger areas,and other areas are no impact danger areas.The fracturing technology of L-shaped horizontal well on the surface,large diameter pressure relief drilling of coal seam,coal seam blasting and roof pre-cracking blasting are used to relieve pressure in the impact danger area,which effectively reduces the impact risk during the mining of the working face and provides a guarantee for the safe mining of the working face.