Severe deformation occurred at the siluric stratum at the ridge of Wushaoling Tunnel, causing splitting of primary lining and even exceeding clearance limit.

乌鞘岭隧道岭脊段志留系地层千枚岩夹板岩地段，施工中发生大变形，初期支护开裂破坏甚至侵限。

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Based on gray system, programming the software, which can be used to forecast the final clearance displacement of tunnel according to some data of monitoring, named GM-TUNNEL.

根据灰色理论编写了围岩收敛位移的预测程序GM - TUNNEL，预测收敛位移测试点的最终收敛位移。

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Small clearance tunnel is a tunnel form between separated tunnel and multi-arch tunnel. It is much easier to construct, waterproof and control the cost.

小净距隧道是介于分离式隧道和连拱隧道之间的隧道结构形式，该结构形式比连拱隧道施工工艺更简单，且易于防水处理和造价控制。

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