高海拔软弱围岩条件下小净距隧道施工技术

Construction technology of neighborhood tunnel under high altitudeweak surrounding rock

本文根据大武至久治公路隧道地处高海拔软弱围岩地区的实际情况,对高海拔地区软弱围岩条件下小净距隧道施工技术进行了研究,施工采用新奥法和相应控制爆破技术,确定了合理的开挖方法,严格控制爆破装药量,开挖后喷锚支护及时跟进,确保隧道围岩的稳定;同时施工过程接受监控量测数据信息的动态指导,施工过程安全受控。

This paper investigates the construction technology of neighborhood tunnel under the condition of weak surrounding rock in the high and cold region, based on the actual situation that the highway tunnel from Dawu to Jiuzhi which located in Tibetan Plateau. New Austrian Method and some control blasting technologies has been used in the tunnel construction process. Reasonable tunnel excavation method has been selected. Blasting charge weight has been strictly controlled. Shotcrete and rock bolt support has been constructed in time after excavation in order to ensure the stability of tunnel surrounding rock. Meanwhile, the tunnel construction process was monitored by actual measured data. The tunnel construction process was safe and controllable.