【摘要】 广西铜坑矿床的92号矿体为缓倾斜厚大贫锡矿体,其稳定性较差,且底顶板起伏大,在该矿体试验采用大直径平行深孔空场采矿法开采。简述了试验采场的采准、切割工程的设计,重点介绍了凿岩爆破参数的选择和爆破效果,并根据实践结果,对开采该矿体的大直径深孔孔网参数提出了建议。更多还原

【Abstract】 92# orebody in Tongken tin mine, Guangxi province, is one with flat dip, great thick and low grade, whose not only stability was poorer but also floor and roof were very irregular. The parallel large-diameter longhole open stoping method was used to mine this orebody experimentally. The design of preparatory work and cut-out operation of test stope are described, with the emphasis on the selection of drilling and blasting parameters and the blasting effect. According to the results from practice, the proposals for the grid parameters of large-diameter longholes used for mining this oreebody are made.更多还原