The ground pregrouting and pipe-roof protection method have been adopted to treat the soft wall rocks of shallow depth near the portal of Wulong tunnel in Yuhuai railway.

• 摘要采用地表预注浆和管棚超前预支护技术，对渝怀铁路武隆隧道进口段的浅埋、软弱围岩进行处理。