富水砂性地层深基坑单井及群井抽水试验分析
摘要:富水砂性地层有着黏聚力低、稳定性差、渗透性强的特点，在该地层中进行基坑施工会面临众多风险。为了探究该地层的水文地质特性，确保基坑施工安全，基于现场抽水试验及三维有限差分反演分析，得出如下结论：（1）本工程第③、⑤1、⑤2、⑤3层水位联系不密切，第④2、⑤t、⑤2层透水性较差，为弱透水层；进行单井试验的⑤1层的影响半径为135 m，第③层的影响半径为52 m；（2）通过群井抽水试验和三维数值模拟反演，测定了主要含水层的包括渗透系数、导水系数以及贮水率在内的水文地质参数；（3）通过分析抽水试验地表沉降监测数据，⑤1层群井抽水引起沉降在抽水结束后可以回弹25%左右，而⑤2层、⑤3层群井抽水沉降回弹约40%左右。各个水位恢复阶段，沉降回弹有明显滞后现象。
Abstract:Water-rich sandy strata has the characteristics of low cohesion, poor stability, and strong permeability. Excavation construction in this strata can be risky. Hydraulic characteristics of this strata were studied to ensure the safety of construction. Based on the field pumping test and three-dimensional inversion analysis, the following conclusions are drawn: (1) The hydraulic connection between aquifers ③, ⑤1, ⑤2, and ⑤3 are not strong, and layers ④2, ⑤t and ⑤2 are poorly permeable. The influence radius of aquifers ⑤1 and ③ are 135 m and 52 m, respectively. (2) The hydraulic parameters of the main aquifers, including permeability coefficient, hydraulic conductivity and specific storage, were determined by numerical inversion. (3) The settlement caused by the group-well pumping in aquifer ⑤1 can rebound by about 25%; while the pumping-induced settlement of group-well pumping in aquifers ⑤2 and ⑤3 rebounds by more than 40%. At each stage of water level recovery, there is an obvious time lag of settlement rebound.
中文标题：
富水砂性地层深基坑单井及群井抽水试验分析
Analysis of Single Well and Group Wells Pumping Tests for Deep Excavation in Water-rich Sand
作者：
刘祥勇1,,龙莹莹2, 3,景旭成1,洪小星1,樊冬冬2,谭勇2
Liu Xiangyong1,,Long Yingying2, 3,Jing Xucheng1,Hong Xiaoxing1,Fan Dongdong2,Tan Yong2
作者简介:刘祥勇，男，1980年生，江苏连云港人，硕士研究生，高级工程师，主要从事基坑工程研究。E-mail：47150235@qq.com
通讯地址：
1.南通城市轨道交通有限公司，江苏南通 226000 2.同济大学 土木工程学院，上海 200092 3.四川省建筑科学研究院有限公司，四川成都 610081
1.NantongRailTransitCo.,Ltd.,Nantong226000,Jiangsu,China 2.CollegeofCivilEngineering,TongjiUniversity,Shanghai200092,China 3.SichuanAcademyofBuildingResearchCo.,Ltd.,Chengdu610081,Sichuan,China
中图分类号:TU 758.11
doi:10.3969/j.issn.1007-2993.2021.04.013
出版物：岩土工程技术
收稿日期:2020-07-03
刊出日期:2021-08-25
关键词:抽水试验,水文地质参数,影响半径,地面沉降
Key words:pumping test,hydrogeological parameters,radius of influence,ground subsidence
文档包含图片数量：图片(13)张
文档包含表格数量：表格(3)个
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