深基坑群井降水法效果研究与实例分析  

Study on the effect of deep foundation pit group well dewatering method and case analysis

作　　者：庄群虎 顾家慧 Zhuang Qunhu;Gu Jiahui(Suzhou Rail Transit Group Co.,Ltd.,Suzhou 215000,China;College of Civil and Transportation,Hohai University,Nanjing 210098,China)

机构地区：[1]苏州市轨道交通集团有限公司,江苏苏州215000 [2]河海大学土木与交通学院,江苏南京210098

出　　处：《山西建筑》2021年第20期55-57,共3页Shanxi Architecture

摘　　要：以苏州市轨道交通6号线工程港田路站基坑降水工程为例,结合工程所在区域的水文地质条件、场地情况和周边环境,重点分析说明了生产性抽水试验对降水运行施工、基坑安全评价和止水帷幕效果的重要指导意义。该工程生产性抽水试验结果表明:基坑临界挖深14.40 m,3口井以单井流量15.0 m^(3)/h抽水时,水位能控制在安全所需,最终水位控制在9.56 m~12.57 m,满足抗突涌计算所需;降水井深度超过围护体深度。抽水试验期间坑内外水位差明显,该区域围护结构(止水帷幕)对⑦2层承压水有明显的绕流作用。Taking the the foundation pit dewatering project of Gangtian Road Station of Suzhou Rail Transit Line 6 as an example and considering hydrogeologic,site and surrounding environment,the passage emphatically analyze and illustrate the significance of productive pumping test for dewatering operation construction,safety evaluation and effect of water stop curtain.The pumping test results show that when the critical excavation depth of the foundation pit is 14.40 m and the three wells are pumped at a rate of 15.0 m^(3)/h per well,the water level can be deemed safe and the final water level can be controlled at the range of 9.56 m~12.57 m,which meets anti-uprush of foundation pit.The dewatering well depth exceeds the envelop enclosure depth.During the pumping test,the difference of water level between inside and outside is obvious,and the envelop enclosure(water stop curtain)has apparent streaming effect to layer⑦2.

关 键 词：深基坑 地连墙 钻孔灌注桩 止水帷幕 

分 类 号：TU463[建筑科学—结构工程]