冲击矿压解危深孔断顶爆破步距数值模拟研究

摘要

采用FLAC3D数值模拟方法研究了深孔断顶步距分别为12m,16m,20m,24m,28m时综放工作面支承压力分布规律,结合新汶矿区冲击矿压防治实践,确定合理深孔断顶步距为20m.通过现场应用实践表明,深孔断顶步距为20m时,9m,7.6m,5.8m处煤体支承压力大小分别降低了30.6%,45.5%,15.2%,实现了综放工作面安全回采,深孔断顶步距合理.%This paper applied FLAC3D to researching distribution rule of abutment pressure in full-mechanized caving mining face when roof-broken pace were respectively 12m, 16m, 20m, 24m and 28m. Combining prevention practice of rock-burst in Xinwen Mining Area, this paper obtained rational roof-broken pace was 20m. Field application showed that when roof-broken pace was 20m, abutment pressure at 9m, 7.6m and 5.8m reduced respectively 30.6%, 45.5% and 15.2%. Safety mining in full-mechanized caving mining face proved this pace was rational.