深部急倾斜特厚煤层分层开采冲击地压防治技术

摘要

为了防治砚北煤矿1502采区急倾斜特厚煤层水平分段开采的冲击地压.对该矿冲击地压发生的影响因素及实测数据进行了分析研究,得出运输巷冲击地压的发生主要受上下分层工作面采掘交替影响,在上部回采工作面超前下部掘进工作面80～150 m时影响最为明显;回风巷除受采掘交替影响外,还受地质构造应力的影响,在煤层倾角突变处的前方100-150 m影响显著.采用钻屑法、电磁辐射法、微震法和地音法对冲击地压实施预测预报;并采取切顶爆破、煤体爆破对顶板及煤体进行卸压措施,掘进工作面冲击地压次数降低了44.4%,回采工作面降低了66.6%,保障了砚北煤矿强冲击地压工作面的安全生产.%In order to prevent and control of the mine pressure bumping of the horizontal slice mining in the steep inclined and ultra thick seam in No.1502 mining block in Yanbei Mine, the paper had an analysis and study on the influence factors of the mine pressure bumping occurred and the site measured data.The analysis and study showed that the mine pressure bumping occurred in the transportation gateway would mainly be affected by the mining and excavation alternative influences of the mining faces in the top and low slice seam.When the top slice coal mining face was 80 ～ 150 m advanced of the low slice gateway driving face, the influence of the mine pressure bumping would be more obvious.Except for the mining and excavation alternative inferences, the air returning gateway would be also affected by the geological structure stress and at 100-150 m in front of the seam angle varied, the influence of the mine pressure bumping would be obvious.The drilling cuttings method, the electromagnetic radiation method, the micro seismic method and acoustic emission method were applied to predict and pre-warn the mine pressure bumping.The roof cut blasting and the seam blasting were applied to release the pressure of the roof and seam.After above measures conducted, the number of the mine pressure bumping occurred from the gateway driving face was reduced by 44.4％, the number of the mine pressure bumping occurred from the coal mining face was reduced by 66.6％ and thus the safety production of the coal mining faces with the strong mine pressure bumping in potential in Yanbei Mine could be ensured.