【作者】 杨应义； 罗建军； 谢小林；

【Author】 Yang Yingyi;Luo Jianjun;Xie Xiaolin;Shanghai Tongji Water Resources Technology Co.,Ltd.;The Architectural Design & Research Institute of Tongji University Co.,Ltd.;

【机构】 上海同继水资源技术有限公司； 同济大学建筑设计研究院(集团)有限公司；

【摘要】 上海某基坑工程周边紧邻地铁隧道、高层建筑等建(构)筑物,环境条件十分复杂。本工程基坑开挖深度约30.0m,面临严峻的⑦层承压水突涌问题,且该区域⑦,⑨承压含水层连通,止水帷幕无法将其隔断,基坑降水对周边环境的影响不容忽视。基于该工程现场回灌试验数据,采用三维有限元数值模拟方法,对基坑工程地下水回灌系统进行了研究与分析。计算表明,地下水回灌系统的作用效果主要与水文地质条件、地下水的绕流路径2个因素密切相关。其中水文地质条件的影响是决定性的,灌抽比、回灌压力、回灌量的确定以及回灌井的布置问距等主要设计、施工参数均需参考水文地质条件确定。而地下水的绕流路径则与坑内抽水井、坑外回灌井以及止水帷幕的相对深度有关,适当增加地下水的绕流路径,采用浅井密布的方式,能确保回灌效果,且有利于环境保护与地下水资源的节约。更多还原

【Abstract】 The excavation environment condition of the background project is very complicated,which is near metro tunnel and high-rise buildings.The depth of excavation is about 30 meters,and facing the severe problem of the rush of confined water which in the⑦ soil layer.The confined water in ⑦ and ⑨ soil layers are connected herein,and it is huge thick.While,the waterproof curtain can not stop the connect of confined water in and outside the excavation.The influence to the environment caused by dewatering of excavation is nonnegligible.Based on the data of groundwater recharge test,the 3D FEM is used to study and analyze the groundwater recharge.Calculation shows that the effects of the groundwater recharge system are closely related to the hydrogeology condition and the flow route.Withdrawal-recharge ratio,re-injection pressure,amount of the re-injection and the plan of the groundwater recharge well are all related to the hydrogeology condition.Increasing the flow route suitably,and planning the groundwater recharge well shallow and densely covered can ensure the groundwater recharge,and it is fine to protect the environment and save the water resource.更多还原