大孔径直排孔的作用是加强矿井排水能力，保证煤矿安全生产。
The large diameter direct drainage borehole is used to strengthening mine drainage capacity, to ensure coalmine safety production.
对气浮法处理煤矿井下排水进行了试验研究。
The experiments of mine wastewater of air floatation are presented.
实际应用表明，该系统提高了煤矿井下排水的安全性和可靠性。
The actual application showed that the system improves safety and reliability of underground drainage.
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