近距离煤层群上保护层开采防突优化设计

Optimization Design of Outburst Prevention under Close Range and Up-protective Coal Seams Condition

为了对一平硐煤矿防突措施进行有效优化,通过矿井保护层开采实际效果考察对比,并结合数值模拟研究,分析了上部保护层开采后下部岩体的应力变化趋势。发现处于保护范围内的钻孔,瓦斯抽采浓度下降幅度变缓,流量总值提升到2.1倍,抽采影响半径由未开采保护层时的3.0 m增加到保护后的5.2 m。

In order to do optimization to outburst prevention measures of Yipingdong coal mine, did numerical simulation and site expedition of comparison effect,and analysed the changing rule of strain after up-protective coal seam mined, and found that decent degree of gas concentration become moderate,total volume increase to 2.1 times,and the influence radius raise to 5.2 meters while it was 3.0 meters before.