新龙过坝交通隧道塌方处理施工技术

Construction Technology for Collapse Treatment of Xinlong Cross-Dam Traffic Tunnel

新龙交通隧道塌方段长40 m,影响段长106 m。通过采用25 m超长大管棚结合台阶法预留核心土技术,为避免爆破扰动采用破碎锤开挖,历时6个月成功完成了塌方处理。阐述了所采用的施工工艺及方法,所取得的经验可为今后类似工程问题处理提供参考。

The collapse section of Xinlong Traffic Tunnel is 40m with the affected section of 106m.The collapse treatment was successfully completed in 6 months,which has applied the technology of 25m super long pipe roof combined with benching method to reserve core soil.In order to avoid blasting disturbance,crushing hammer has been used for excavation.The construction technology and methods adopted are described.The experience obtained can provide reference for similar engineering problems in the future.