基于群井抽水试验的承压含水层水文参数反演分析
Back Analysis of Hydrogeological Parameters of Confined Aquifer Based on Multi Well Pumping Test
徐中华 1宗露丹 1王卫东 2罗建军3
作者信息
- 1. 华东建筑设计研究院有限公司上海地下空间与工程设计研究院,上海 200011;上海基坑工程环境安全控制工程技术研究中心,上海 200002
- 2. 上海基坑工程环境安全控制工程技术研究中心,上海 200002;华东建筑集团股份有限公司,上海 200011
- 3. 上海汇谷岩土工程技术有限公司,上海 201108
- 折叠
摘要
城市区域复杂环境条件下的深基坑工程往往涉及复杂的承压水处理问题,当承压含水层深度较大且采用悬挂帷幕结合坑内减压降水方案时,需合理评估承压水降水对周边环境的影响,而其关键是要确定合理的水文地质参数.本文结合位于长江漫滩地貌单元的某深基坑工程,在基坑实施前针对其深厚承压含水层开展了现场群井抽水试验,根据单井抽水试验的解析方法给出了初步的水文地质参数,在此基础上,建立了群井抽水试验的地下水渗流数值分析模型,基于反演分析确定了合理的水文地质参数,为分析基坑承压水降水对周边环境影响提供了直接依据.
Abstract
Deep foundation pit engineering under complex environmental conditions in urban areas often involves complex confined water treatment problems.When the confined aquifer is relatively deep and only the scheme of hanging curtain combined with pit decompression water can be adopted,it is necessary to assess the impact of confined water precipitation on surrounding environment.And one of the key problem is to determine reasonable hydrogeological parameters.Based on a deep excavation project located in the Yangtze River floodplain geomorphic unit,a field pumping test of multiple wells was carried out for its thick confined aquifer.The preliminary hydrogeological parameters were given according to the analytical method of single well pumping test.On this basis,a numerical analysis model of groundwater seepage for multiple well pumping test was established,and reasonable hydrogeological parameters were determined based on back analysis.It provided a direct basis for analyzing the impact of confined water dewatering on the surrounding environment.
关键词
深基坑/承压水/群井抽水试验/水文地质参数/反演分析Key words
deep excavation/confined groundwater/multiple well pumping test/hydrogeological parameters/back analysis引用本文复制引用
基金项目
上海市自然科学基金(23ZR1414700)
上海市青年科技英才扬帆计划资助(22YF1409600)
上海市科委研发项目(22dz1202901)
出版年
2024
NETL
NSTL
万方数据