overburden drilling method
... 覆盖层钻孔法overburden drilling method 水力开采法hydraulic mining 水下爆夯(水中爆破) underwater compacting blast ...
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overburden drilling method
覆盖层钻井法
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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And the height of water flowing fractured zone in overburden strata is calculated by the empirical formula and is measured with a simple hydrological observation method according to drilling on spot.
用经验公式对覆岩导水裂隙带高度进行了计算，采用简易水文观测法对覆岩导水裂隙带高度进行了测定。
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