煤矿深孔预裂爆破技术应用研究

为解决较厚坚硬煤层的瓦斯突出和回采率低的问题,采用深孔预裂爆破的方法增加其透气性,并利用煤层松动产生的局部应力突变增加落煤量。根据爆破理论计算了爆破参数,确定了爆炸作用的裂隙范围。实践表明,煤层瓦斯含量降低,提高了回采率,试验与理论基本一致。

CONTROLLED BLASTING OF SUBGRADE OCCUPIED BY CABLE MACHINE IN XIALAOXI BRIDGE

The subgrade at the end of Xialaoxi bridge was occupied by a cable machine,next to some important buildings,such as bridge abutment and a 500kV transmission line.To meet the requirement of construction schedule,different techniques of blasting benches were adopted in different district,and meanwhile,safety control was also strengthened in the blasting operation.The blasting successfully made the bridge abutment and the flyrocks or fragments under control.