高海拔富水隧道斜井辅助正洞施工抽排水技术研究--以西藏林拉公路米拉山特长隧道为例  

Drainage Technology of Main Tunnel Construction Assisted by Inclined Shaft in High-Altitude Water-Rich Tunnels:a Case Study on Extra-Long Milashan Tunnel of Nyingchi-Lhasa Highway in Tibet,China

作　　者：杨洋 唐柯 龚彬 严健[2] 汪波[2] YANG Yang;TANG Ke;GONG Bin;YAN Jian;WANG Bo(China Railway Erju 5th Engineering Co.,Ltd.,Chengdu 610091,Sichuan,China;Key Laboratory of Transportation Tunnel Engineering,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,Sichuan,China)

机构地区：[1]中铁二局第五工程有限公司,四川成都610091 [2]西南交通大学交通隧道工程教育部重点实验室,四川成都610031

出　　处：《隧道建设（中英文）》2021年第12期2171-2177,共7页Tunnel Construction

基　　金：国家自然科学基金高铁联合基金项目(U2034205);国家自然科学基金项目(52178397)。

摘　　要：为解决高海拔环境下富水隧道抽排水问题,保证施工安全和进度,以我国新建成世界海拔最高的西藏林拉公路米拉山特长公路隧道为工程依托,利用理论分析和现场测试等方法,分析高海拔富水隧道涌水量特点、高海拔环境下抽排水机械设备的降效特性及设备选型配置原则,设计斜井辅助正洞施工抽排水方案并对水泵排水量及扬程等进行核算。研究表明:1)米拉山隧道穿越富水断层,施工中水量巨大、涌水持续时间长、水量分布不均;2)高海拔环境对抽排水机械设备的影响显著,测试表明发电机组、抽水机组最高输出功率仅为额定功率的66.2%和90%;斜井辅助主洞施工段设置3级固定泵站,泵站抽水设备采用不同功率的水泵和增压泵,水泵选型配套验算显示水管选型、水泵扬程均满足要求。To realize efficient drainage of water-rich tunnels in high-altitude environments and ensure construction safety and progress,the extra-long Milashan tunnel of the Nyingchi-Lhasa highway in Tibet,China is investigated.The characteristics of water inflow in high-altitude water-rich tunnels,efficiency reduction characteristics of pumping and drainage machinery,and principle of equipment selection and configuration are analyzed through theoretical analysis and field tests.The pumping and drainage scheme of the main tunnel drainage assisted by an inclined shaft is designed,and the displacement and pump head are calculated.The results show the following:(1)the Milashan tunnel passes through a water-rich fault,and there is a large volume of water inflow,long water inflow time,and uneven water distribution;and(2)high-altitude environments affect pumping and drainage machinery and equipment.The test results show that the maximum output power of the generator set and pumping unit is only 66.2%and 90%of the rated power,respectively.Therefore,three levels of fixed pump stations are set in the construction section of the main tunnel assisted by the inclined shaft,and the pumping equipment of the pump station is composed of pumps and booster pumps of different power.Matching calculations show that the selection of water pipes and the pump head meet the requirements.

关 键 词：隧道工程 高海拔富水隧道 斜井辅助正洞抽排水 降效特性 

分 类 号：U45[建筑科学—桥梁与隧道工程]