1973年加拿大试验成功了以自行式潜孔钻机钻凿大直径深孔的阶段空场法,此后因世界各国的重视在各矿山相继试验和推广了大直径深孔阶段空场采矿法,用于回采矿房、矿柱均取得很大成效,如表所示。与此同时该方法在原有基础上进一步发展出现了 In 1973, Canada successfully tested the stage empty-field method of drilling a large-diameter deep hole with a self-propelled downhole drilling rig. Since then, various countries in the world have successively tested and promoted the large-diameter deep-hole stage open-field mining method for mining Mining houses, pillars have achieved great success, as shown in the table. At the same time, this method has been further developed on the basis of the original