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河谷砂矿的含水量很大,开采时需要采取综合措施疏干矿床,并排出流入地下坑道的地下水。为了降低费用和提高劳动生产率,建议沿河谷在坚硬岩石中采用深孔药壶爆破,破碎矿床底盘岩层以形成疏水道。在同一排中以一定间距同时起爆深孔药壶后,就能形成相互连通的地下疏水道,并且局部地为坚硬碎石所充填。穿孔和爆破从露天坑道开始,该坑道布置在试验区的下部边界以外,用来汇集和排出地下水。钻孔深度应比砂矿厚度大1.5～3
River sand contains very large amounts of water and requires comprehensive measures to mine the deposits and discharge groundwater that flows into underground tunnels. In order to reduce costs and increase labor productivity, it is advisable to use deep-hole pot blasting in hard rock along the valley to break up the bedrock of the deposit to form a drain. In the same row with a certain distance at the same time detonation deep-hole medicine pot, you can form an interconnected underground drainage channels, and partially filled with hard gravel. Perforation and blasting started from an open pit, which was placed outside the lower boundary of the test area to collect and discharge groundwater. Drilling depth should be greater than the thickness of sand ores 1.5 ~ 3