岩溶区隧洞开挖对地下水位的影响  

Study on the Influence of Tunnel Excavation on Groundwater Level in Karst Area

作　　者：姚军[1] 马翠玲[2] Yao Jun;Ma Cuiling(Hefei University,Hefei 230601,China)

机构地区：[1]合肥学院城市建设与交通学院,安徽合肥230601 [2]合肥学院,安徽合肥230601

出　　处：《廊坊师范学院学报（自然科学版）》2021年第4期98-102,共5页Journal of Langfang Normal University(Natural Science Edition)

基　　金：安徽省高等学校自然科学研究项目重点项目“复杂地质条件下地铁隧道衬砌-围岩协同承载机理与渗流-应力耦合环境效应研究”(KJ2019A0822);安徽省高校优秀青年人才支持项目“长距离地铁隧道安全与控制关键技术研究”(gxyq2020067);合肥学院自然科学基金重大项目“地铁隧道在复杂地质条件下渗流-应力耦合环境效应与渗流控制研究”(18ZR02ZDA)。

摘　　要：采用泰斯公式近似式解析法和ABAQUS数值计算方法,分析隧洞施工对地下水位降深的影响。通过理论推导泰斯公式近似式计算抽水井排水过程,以近似计算隧洞开挖过程中地下水位线降深;根据实际工况建立二维模型,根据渗流场计算隧洞开挖过程中地下水位下降深度。研究发现:(1)隧洞开挖时地下水疏干呈倒圆锥型,泰斯公式近似式可计算倒圆锥体半径、体积和降深;(2)通过ABAQUS软件数值计算隧洞开挖过程,随着开挖时间增长,地下水位下降速率减缓,最终可能下降到隧洞底部区域。隧洞施工对地下水环境的影响规律可为后续工程开展提供一定的借鉴。The influence of tunnel construction on groundwater drawdown is analyzed by using the approximate analytical method of Tess formula and ABAQUS numerical calculation method.Through the theoretical derivation of Tess formula,approximate formula,which is used to calculate the drainage process of pumping well,so as to approximately calculate the drawdown of groundwater level during tunnel excavation.A two-dimensional model is established according to the actual working conditions,at the same time the falling depth of groundwater level during tunnel excavation is calculated by the seepage field technology.The results are as follows:(1)During tunnel excavation,the shape of groundwater drainage is similar to inverted cone,and the approximate formula of Tess formula can calculate the radius,volume and drawdown of the inverted cone.(2)It calculates the process of tunnel excavation through ABAQUS numerical software,with the increase of excavation time,the decline rate of groundwater level slows down and the level may eventually drop to the bottom area of the tunnel.The influence law of tunnel construction on groundwater environment can provide a certain reference for the follow-up project.

关 键 词：引水隧洞 隧洞开挖 泰斯公式 地下水环境 非线性计算 

分 类 号：TV554[水利工程—水利水电工程]