文登抽水蓄能电站工程区地下水三维非稳定渗流场的数值模拟  

A Numerical Simulation of the Three-dimensional Transient Ground Water Seepage in Wendeng Pumped Storage Power Station Project Areas

作　　者：刘昌军[1] 高立东 丁留谦[1] 张顺福[1] 

机构地区：[1]中国水利水电科学研究院,北京100038 [2]中水顾问集团北京勘测设计研究院,北京100024

出　　处：《中国农村水利水电》2012年第4期107-112,共6页China Rural Water and Hydropower

基　　金：国家国际科技合作计划资助(2010DFA74520);"十一五"国家科技支撑计划项目(2008BAB42B05;2008BAB42B06)

摘　　要：抽水蓄能电站建设中的尾水隧洞开挖可能引起的周围地下环境的变化,在水文地质条件和工程地质特征的分析的基础上,研究了文登抽水蓄能电站工程区地下水分布特征和平硐、尾水隧洞开挖引起的强排水特征,概化出工程区水文地质概念模型,建立了工程区地下水三维非稳定渗流模型。采用求解有自由面渗流场的改进的截止负压法、改进的排水子结构法、管道子结构法和预处理共轭梯度法等理论对文登抽水蓄能电站平洞开挖和尾水隧洞开挖(衬砌后)不同施工阶段的非稳定渗流场进行了数值模拟分析。研究了尾水隧洞开挖(不衬砌)后、尾水隧洞开挖衬砌后这两种方案下地下水渗流场动态变化过程及对周围地下水环境的影响。计算结果表明:①平硐和水道系统开挖对研究区地下水位下降有着直接的影响,且影响较大。②尾水隧洞衬砌300d后,地下水流场基本恢复至稳定状态。Based on the surrounding underground environments change caused by tailrace tunnel excavation at Wendeng Pumped Storage Power Station,characteristics of groundwater distribution and strong drainage features due to adit and tailrace tunnel excavation are investigated based on an intensive analysis of hydrogeological conditions and engineering geological characteristics of the project area.Consequently,conceptual model of hydrogeology is presented and three-dimensional transient groundwater seepage model is established.By using improved cut-off negative pressure method to solve seepage flow with free surface,we have improved drainage substructure technique,pipeline substructure technique and preconditioned conjugate gradient method,simulation and analysis on the transient seepage at different construction stages of adit and tailrace tunnel excavation after linings are carried out.Dynamic variation procedure of the groundwater seepage flow and its influence on surrounding environments are studied for two schemes： tailrace tunnel excavated with and without lining.Results show that adit and channel system excavations have a direct and great influence on the lowering of water level and that groundwater seepage field gradually turns to steady state 300 days after lining of tailrace tunnel.

关 键 词：地下水环境 非稳定渗流 尾水隧洞 预处理共轭梯度算法 

分 类 号：TV31[水利工程—水工结构工程]