Wulongling tunnel on the Jingzhu Expressway is a dual-arch highway tunnel with a large span, shallow depth, poor geology and uneven ground pressure.
五龙岭隧道由于其特殊的地形地质情况，使该隧道具有大跨、浅埋、软弱不良地质和偏压等四大难点。
Soft rock tunnels have the characteristics of high ground pressure and large deformation and are difficult to be supported. So they can not be easily controlled with single support method.
软岩巷道多具有高应力、变形大、难支护等工程特征，单一支护方式难以控制围岩变形。
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