乌鞘(shāo)岭位于甘肃省武威市天祝藏族自治县中部，属祁连山脉北支冷龙岭的东南端。为陇中高原和河西走廊的天然分界。也是半干旱区向干旱区过渡的分界线，也是东亚季风到达的最西端。东西长约17公里，南北宽约10公里，主峰海拔3562米，年均气温-2.2℃，志书对乌鞘岭有"盛夏飞雪，寒气砭骨"的记述，是古丝绸之路上河西走廊通往长安的重要关隘。
乌鞘岭隧道4号斜井施工中突遇煤层，并有瓦斯释放。
Coal stratum was encountered during excavation of inclined shaft No. 4 of Wushaoling Tunnel, and gas was released.
乌鞘岭隧道是兰新线重点控制工程，是国内最长的单线铁路隧道。
Wushaoling railway tunnel is the longest single-track railway tunnel in China and is the key project of Lanxin railway line.
兰新复线兰武段乌鞘岭隧道F 7断层，为区域性大断层，地应力高。
F7 fault of Wushaoling tunnel, which lies in lanzhou-wuwei section of Lanxin railway line, is a large regional fault with high geostress.
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