一、前言 美国潘西尔维尼亚州极为严格的钻采法采矿安全法规,促使一位露天矿主利用预爆法得到整齐切割的阶段边坡。由于利用低成本的空气冲击爆破技术,克利飞尔德·帕的瓦罗奎尔煤炭公司的小型矿能使煤产量多回收10,000吨。空气冲击爆破技术要比爆破法省钱,因为前者可以减少三分之二的炸药量。如果用爆破法来剥离表层,那么爆破的 I. INTRODUCTION The extremely stringent mining and mining laws and regulations of the Pennsylvanian state of the United States prompted an open pit mine owner to use the pre-blast method to get a neatly cut stage slope. Due to the low cost of air blast technology, the small mine at Clearfield Coal at Clearfield Pa can recover an additional 10,000 tons of coal. Air blast technology saves more money than blasting because the former can reduce the amount of explosives by two thirds. If the blasting method to peel the surface, then blasting