Coal stratum was encountered during excavation of inclined shaft No. 4 of Wushaoling Tunnel, and gas was released.
乌鞘岭隧道4号斜井施工中突遇煤层，并有瓦斯释放。
Methods An inclined tube well collecting percolating ground water with powerful pump in the water-bearing stratum in the depth of 30 meters below the riverbed of Huanghe River was built.
方法打斜管井深入黄河河床以下30 m处，以大功率水泵抽水，经加氯消毒后供生活饮用。
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