四川松潘某隧道建设对地下水动力环境影响预测模拟  

Numerical simulation of impacts of mountain tunnel construction on groundwater environment

作　　者：康小兵[1,2] 胡卸文[1] 

机构地区：[1]西南交通大学地球科学与环境工程学院,成都610031 [2]成都理工大学环境与土木工程学院,成都610059

出　　处：《南水北调与水利科技》2015年第1期113-117,共5页South-to-North Water Transfers and Water Science & Technology

基　　金：国家自然科学基金资助项目(40972175);中央高校基本科研业务费专项基金(SWJTU11ZT14);成都理工大学青年基金资助项目(2011QJ23)

摘　　要：为充分了解隧道建设对地下水环境的改变,在准确获取四川省松潘县某隧道围岩地质结构及相关渗透参数基础上,采用Visual Modflow可视化三维软件,模拟3种方案(天然条件、隧道开挖、隧道运营)下5种不同工况隧道建设对地下水环境的影响。结果表明,在天然状态下,隧址区地下水位埋藏浅、变化较小,地下水环境稳定;隧道局部开挖条件下,地下水环境发生明显变化,在隧道开挖段疏干范围明显增大,地下分水岭向未开挖段偏移,而未开挖段地下水环境与天然条件相比变化不明显;隧道贯通后,地下水垂直向下流向隧道,地下水疏干范围逐步扩大;在加防渗条件下,地下水不再垂直向下流向隧道,且地下水环境基本可以恢复到天然状态。综上,在基岩裂隙山区建设隧道时,应同步进行防渗施工,以减小工程建设对地下水环境的干扰,同时也可以防止隧道涌突水事故的发生。In order to understand the impacts of mountain tunnel construction on groundwater environment,Visual Modflow,a three-dimensional visualization software,was used to simulate the impacts of tunnel construction under five working conditions on groundwater environment with three schemes(natural conditions,tunnel excavation,and tunnel operation)based on the accurate estimation of the geological structure of surrounding rock and the relevant parameters.The results showed that(1)under the natural conditions,groundwater depth is shallow with little variation in the tunnel area,and groundwater environment is stable;(2)under the partial excavation conditions,groundwater environment changes obviously.Drainage area increases significantly in the tunnel excavation area and groundwater divide moves to the tunnel area without excavation,but groundwater environment in the tunnel area without excavation is similar to that under natural conditions;(3)under the complete excavation conditions,groundwater moves downward to the tunnel,and tunnel drainage area continues to expand;and(4)under the anti-seepage conditions,groundwater no longer moves downward to the tunnel and groundwater environment can recover to the natural conditions.Therefore,anti-seepage construction needs to be performed during the mountain tunnel construction in order to reduce the impacts of engineering construction on groundwater environment and to prevent the water inrush accident in the tunnel.

关 键 词：隧道 地下水环境 渗流场 数值模拟 

分 类 号：P641[天文地球—地质矿产勘探]