武隆隧道进口段浅埋软弱围岩的处理技术

Technique for Treating Soft Wall Rocks of Shallow Depth Near the Portal of Wulong Tunnel

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。实践表明 ,本文所采用的地层预加固方法改善了土体的结构性能 ,提高其自稳性和承载能力 ,取得了预期的加固效果。

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. The practise shows that the technique prestented in this paper can not only improve the performance of soil but also enhance its stability and load bearing capacity.The practical results have achieved the desired expectations.