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上煤层开采使下邻近层卸压,下邻近层瓦斯压力将会下降。准确测定上煤层开采前后下邻近层瓦斯压力的变化,确定下邻近层的卸压保护范围,对下邻近层瓦斯治理有重要意义。利用速凝水泥封孔测压工艺,在庞庄煤矿张小楼井-1025西一下山采区7煤层工作面施工测压钻孔测定9煤层的瓦斯压力,考察7煤层工作面推进过程中下邻近层9煤层瓦斯压力的变化规律。结果表明,7煤层工作面回采前后,9煤层瓦斯压力由0.65 MPa下降至0.41 MPa,走向卸压角为65°,走向卸压保护距离为13.5 m,7煤层开采对9煤层卸压效果显著。
Coal mining on the lower adjacent layer pressure relief, gas pressure in the next lower layer will decline. The accurate determination of the gas pressure near the lower seam before and after the coal seam mining to determine the scope of pressure relief protection of the adjacent layer is of great significance to the gas treatment of the next adjacent layer. Using the quick-setting cement sealing and pressure-measuring technique, the gas pressure of 9 coal seam was measured by pressure-measuring drilling in the seam face of No.7 coal seam of Zhangxiaolou-1025 west of Pangzhuang coal mine, Variations of Gas Pressure in Seam 9 in Neighboring. The results show that the gas pressure of No.9 coal seam decreases from 0.65 MPa to 0.41 MPa, the relief pressure is 65 ° and the protection distance to pressure relief is 13.5 m before and after the mining face working in No.7 coal seam. The effect of pressure relief on No.9 coal seam is significant.