多含水层地层45m级基坑承压水控制设计与实践  

Design and Practice of Confined Water Control of 45m-level Deep Foundation Excavation in Multiple Aquifer Area

作　　者：宗露丹 ZONG Ludan(Shanghai Underground Space Engineering Design&Research Institute,East China Architecture Design&Research Institute Co.,Ltd.,Shanghai200011,China;Shanghai Engineering Research Center of Safety Control for Facilities Adjacent to Deep Excavations,Shanghai200002,China)

机构地区：[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 [2]上海基坑工程环境安全控制工程技术研究中心,上海200002

出　　处：《施工技术（中英文）》2024年第7期116-123,共8页Construction Technology

基　　金：上海市青年科技英才扬帆计划资助(22YF1409600);上海市自然科学基金(23ZR1414700)。

摘　　要：城市深层地下空间开发已成为城市发展的必然趋势,越来越多的超深基坑工程逐渐涌现。上海作为典型滨海地貌单元分布区,深部分布有复杂的多层含水层,包括微承压含水层及第Ⅰ、第Ⅱ、第Ⅲ承压含水层,部分相互联通的巨厚承压含水层厚度达50m以上,因而超深基坑实施将涉及更为复杂的多层承压含水层减压控制设计。为此,依托某挖深达45m的非圆形基坑工程,基于现场抽水试验开展了深部承压含水层水文地质参数反演分析,提出了同时满足坑内减压需求及坑外环境影响控制要求的隔-降-灌一体化承压水分层减压控制设计原则及双帷幕体系隔水方案。背景工程的承压水试验试运行及正式减压降水控制运行的实施效果良好。The development of deep underground space has become the inevitable trend of urban development in Shanghai area.Therefore,the ultra-deep excavation project gradually emerge.As a typical coastal geomorphic area,Shanghai has complex multi-layer aquifers,including micro-confined aquifers and confined aquifers Ⅰ,Ⅱ and Ⅲ.Some of the interconnected super-thick confined aquifers have a thickness of more than 50m.Therefore,the ultra-deep excavation project will face a series of complex confined water control problems.Take a scientific installation project as the background project,which is the deepest non-circular 45m-level excavation in Shanghai.Based on field pumping test,the inversion analysis of aquifer hydrogeological features is carried out.In order to meet the requirements of pressure reduction in the excavation and environmental impact control outside the excavation,the compartmental-reduction-irrigation groundwater control method and the double curtain system are put forward.The control effect of confined water test and formal dewatering project is well.

关 键 词：深基坑 含水层 承压水 降水 隔水帷幕 反演分析 设计 

分 类 号：TU443[建筑科学—岩土工程]