高海拔地区隧道岩爆影响因素及防治措施探讨

隧道岩爆段施工仍是个重大难题,高海拔隧道施工环境中岩爆现象既危害作业人员安全,又使机械设备的工作条件恶化,故障增多,甚至造成施工无法进行。分析了岩爆发生的特征及影响因素,并提出了岩爆防治措施,包括注水或喷水减压湿化掌子面、围岩应力分散及支护参数加强等,基于施工实践,指出本隧道防治措施为达嘎山隧道安全施工和支护设计优化提供了数据,也为高海拔地区复杂地质条件下的岩爆防治提供了一定的参考。

Probe into the Influencing Factors and Prevention Measures for the Tunnel Rock-burst in High Attitude Area

The construction of tunnel rock-burst section is still a major issue, the rock-burst phenomenon in tunnel construction environment in high attitude area not only endanger the safety of workers but also make the equipment＇s working conditions worse, the number of fault increase, and even causes the construction paused. This paper analyzes the features and influencing factors of the rock-burst, and puts forward some measures for preventing the rock-burst including depressurizing and wetting the tunnel face through water flooding and water spraying, dispersing stress on wall rock, and strengthening the support parameter, etc., and based on the construction practice, points out that the prevention measures of this tunnel provide some data for the safe construction and support design optimization of Dagashan Tunnel, and also provide certain references for the rock-burst prevention under complicated zeolo~ical conditions in high attit, Me area.