By using FLAC2D , the influence of different drilling diameter, drilling distance and burial depth to drilling pressure relief has been simulated in this paper. It can be proved that: ①With the drilling pressure relief, stress concentrated in the left and right sides, the stress around the drilling especially in the upper and lower part. Meanwhile, larger drilling diameter means better pressure relief effect and larger destruction area around the drilling. Smaller distance of drilling also means better pressure relief effect, when the distance increases to a certain degree, the pressure relief area and intensity will maintain. ②Under the same drilling diameter and small drilling distance to relieve coal pressure, the height of the pressure relief zone are the positive proportion relation to coal seam depth. With the increase of the drilling distance, the height of the pressure relief zone is not changed with the depth, basically tends to the same height. ③With the same drilling parameters, greater coal seam depth means better pressure relief effect. To better prevent rock-burst, reasonable drilling parameters shall be chosen for coal seams with different buried depth.%为研究卸压钻孔对巷道煤体卸压效应的作用，通过FLAC2D数值模拟软件，分别模拟不同埋深条件下钻孔直径以及钻孔间距对钻孔卸压效果的影响。研究结果表明：①在实施钻孔卸压之后，钻孔左右两侧应力集中，钻孔上下两侧形成应力降低区；同时，钻孔孔径越大，钻孔卸压效果越好；钻孔间距越小，卸压效果越好；②相同钻孔孔径进行卸压，钻孔间距较小时卸压带高度和煤层埋深基本成正比例关系，随着钻孔间距的增大，卸压带高度基本不随埋深的变大而变化；③相同的钻孔参数进行钻孔卸压，煤层埋深越大卸压效果越好，同时为了更好地防治冲击矿压，不同的埋深的煤层应选择合理的钻孔参数。将模拟分析结果应用到徐庄煤矿7192工作面，起到了很好的卸压效果。
展开▼
