高寒地区长大隧道反坡排水施工技术分析

摘要

During the construction of rich water section of super long tunnel in alpine region,the water inflow of tunneling is larger which will lead to serious ponding in the hole if it is not drained timely,not only affecting the construction schedule of the tunnel but also having potential safety hazard,Reasonably allocating the tunneling drainage system ensures both the construction safety and schedule.Taking Hufeng tunneling project as an example,the equipment selection and pump station placement for the counter-slope drainage construction of super long tunnel in alpine region is analyzed through the drainage of the tunnel inclined shaft.The engineering practice shows that it can meet the site drainage demand and no water inrush occurred in the shaft,ensuring the tunneling construction schedule and safety.%高寒地区长大隧道富水地段施工,隧道工程的涌水量较大,不及时抽排会导致洞内严重积水,不仅影响隧道施工进度,而且存在安全隐患,合理配置隧道抽排水系统,既保证了隧道施工安全,又确保了施工工期.以虎峰隧道工程为例,通过隧道斜井反坡抽排水,对高寒地区长大隧道反坡排水施工中的设备选型和泵站布置进行分析,工程实践验证了其能满足现场排水需求,斜井内未出现涌突水现象,确保了隧道施工的工期和安全.