引江济淮工程凤凰颈泵站基坑渗流参数测定及渗控方案优化  

Measurement of Seepage Parameters and Optimization of Seepage Control Plan for the Foundation Pit of Fenghuangjing Pump Station in Yangtze-to-Huaihe Water Diversion Project

作　　者：范越 王茂松 张伟[1] 崔皓东[1] 陈劲松[1] FAN Yue;WANG Maosong;ZHANG Wei;CUI Haodong;CHEN Jinsong(Key Laboratory of Geotechnical Mechanics and Engineering of Ministry of Water Resources,Changjiang River Scientific Research Institute,Wuhan 430010,China;Anhui Survey&Design Institute of Water Resources&Hydropower Co.,Ltd.,Hefei 230088,China)

机构地区：[1]长江科学院水利部岩土力学与工程重点实验室,湖北武汉430010 [2]安徽省水利水电勘测设计研究总院有限公司,安徽合肥230088

出　　处：《长江技术经济》2024年第5期75-82,102,共9页Technology and Economy of Changjiang

基　　金：中央级公益性科研院所基本科研业务费项目(CKSF2023306/YT)。

摘　　要：闸站基坑开挖过程中的降水问题重要且复杂。以引江济淮工程凤凰颈改造工程为研究对象,采用现场试验和数值模拟方法,系统分析了基坑降水过程中的渗流问题。基于现场抽水试验数据获取基坑主要含水层水文地质参数,构建了工程区三维渗流模型,对施工期防渗墙封闭前后两个阶段的基坑降水方案开展优化研究,确定了防渗墙和降水井的布置形式。结果表明:工程区主要含水层渗透系数为1.5×10^(-2) cm/s,防渗墙封闭前的纯降水阶段基坑涌水量为14532 m^(3)/d;防渗墙封闭后的墙+井渗控阶段基坑涌水量为9299 m^(3)/d,主要来自墙外降水。解析解和三维渗流模型计算结果相互验证,表明计算结果可信度较高。本研究可为闸站基坑降水方案的优化提供思路和范例。The dewatering problem in the excavation process of the foundation pit is important and complicated.This paper takes the Fenghuangjing Pump Station reconstruction in Yangtze-to-Huaihe Water Diversion,systematically analyzes the seepage problem in foundation pit dewatering through field tests and numerical simulation.Based on on-site pumping test data,the hydrogeological parameters of main aquifer in foundation pit are obtained,and a three-dimensional seepage model for the project area is constructed.The optimization research of the foundation pit dewatering plan before and after the closure of cut-off wall during construction period is carried out,and the layout forms of cut-off wall and dewatering wells is finally determined.The results show that the permeability coefficient of main aquifer in project area is 1.5×10^(-2) cm/s,the drainage volume of foundation pit before the closure of cut-off wall is 14532 m^(3)/d.While after the closure of cut-off wall,with the seepage control scheme of cut-off wall and dewatering wells,the drainage volume is 9299 m^(3)/d,primarily coming from the precipitation outside the wall.The analytical solution and the calculation results from the three-dimensional seepage model are well consistent,indicating the high credibility of the calculation results.This study provides insight and example for optimizing the dewatering plan design of foundation pits in sluice station.

关 键 词：引江济淮工程 抽水试验 渗流控制 数值模型 

分 类 号：TV223.4[水利工程—水工结构工程]