川藏线桑珠岭隧道地下热水成因及选线研究  

Cause Analysis of Geothermal Water and Geological Route Selection Research on the Sangzhuling Tunnel of Sichuan-Tibet Railway

作　　者：何平[1] 张广泽[1] 强新刚[1] HE Ping;ZHAGN Guangze;QIANG Xingang(China Railway Eryuan Engineering Group Co.Ltd,Chengdu,Sichuan 610031,China)

机构地区：[1]中铁二院工程集团有限责任公司,成都610031

出　　处：《铁道工程学报》2020年第6期10-13,23,共5页Journal of Railway Engineering Society

摘　　要：研究目的:川藏铁路沿线特殊的地质背景和地形条件,地下热水成为影响隧道工程施工和运营的重要地质灾害之一。在勘察设计阶段通过查明地下热水的成因、分布特征等,采用合理的地质选线,从而减小地下热水对隧道的影响。研究结论:(1)桑珠岭隧道进口段地下热水主要由大气降水下渗,汇集于增期乡断裂、沃卡东缘断裂带并经深部循环、加温后,由北向南沿断裂径流,受东西向沃卡韧性剪切带、雅鲁藏布江羽张断裂的横穿切割,引起地下热水上涌形成温泉;(2)为减小地下热水对隧道施工及运营的影响,勘察期间线位尽可能靠近雅鲁藏布江深切河谷地下热水排泄区,使隧道尽可能位于地下热水面之上;(3)本研究成果对同类型地下热水地区地质选线有一定的借鉴意义。Research purposes: Due to the special geological background and topographical conditions along the Sichuan-Tibet Railway,the geothermal water has become one of the important geological disasters affecting the construction and operation of tunnels. By identifying the cause and distribution characteristics of the geothermal water and adopting reasonable geological route selection in the survey and design stage,the influence of the geothermal water on the tunnel can be reduced.Research conclusions:( 1) The geothermal water in the entrance region of the Sangzhuling tunnel is mainly supplied by the infiltration of atmospheric water. Atmospheric water is collected in the Zengqixiang fault and the Woka fault zone,and after deep circulation and heating,it flows from north to south along the fault,and gushes up by an aisle of the barrier fault which cross-cutting by the east-west Woka ductile shear zone and the Yarlung Zangbo River plume fault,then forms hot springs.( 2) In order to reduce the influence of the geothermal water on the tunnel construction and operation,the railway line should be as close as possible to the geothermal water discharge area of the deep-incised valley of the Yarlung Zangbo River during survey,and make the tunnel above the high temperature geothermal water surface.( 3) The research results can guide the geological route selection in the geothermal water area with the same type.

关 键 词：川藏线 拉林段 高温地下热水 工程地质选线 

分 类 号：U212.32[交通运输工程—道路与铁道工程]