管井降水过程中不同停井方案的对比分析  

Comparative Analysis of Different Well Shutdown Schemes in the Process of Point Well Dewatering

作　　者：乔承杰 杨文强 陈俊伟 QIAO Chengjie;YANG Wenqiang;CHEN Junwei(Henan Geological investigation and designing institute Co.Ltd.,Zhengzhou 450000;Henan Zhao yang Architecture Design Co.Ltd.,Zhengzhou 450000)

机构地区：[1]河南省建院勘测设计有限公司,郑州450000 [2]河南省朝阳建筑设计有限公司,郑州450000

出　　处：《土工基础》2023年第5期764-768,共5页Soil Engineering and Foundation

摘　　要：很多基坑在进行一段时间的降水运行后,适当停止部分管井的运行,这样既不影响降水效果,又能降低施工成本的现状,以郑州某项目为研究对象,通过简化周边环境、土层数据和降水设计参数,以潜水非完整井为计算模型,对不同停井方式进行验算分析,调整后的单井出水量、水力梯度、基坑内任一点水位降深均能满足设计施工的要求,认为动态调整降水管井数量是可行的。方法简单可靠,计算内容少,管井数量的减少使得降水运行成本明显降低,对实际工程有一定的借鉴意义。但应注意一般安排在枯水季进行降水方案的调整;管井或水泵的损坏导致水位上升较快,单井出水量上升是否超过水泵的额定流量,施工安排和工期等情况;采取“坑内全停”后,基坑中心水位降深仅为6.3 m,安全储备不足,故不能选择“坑内全停”的方式。In the view of the shutting down the operation of some point wells will not affect the dewatering effect and reduce the construction cost after a period of dewatering operation in many of the deep excavation projects,this paper presents a case history of a dewatering project in Zhengzhou.Throughout the simplification of the surrounding environment,soil layer data and dewatering design parameters,the phreatic incomplete well was modelled to check and to analyze different well conditions.The adjusted single well water yield,hydraulic gradients,and the water level drawdown at any point in the excavated area can meet the requirements of design and construction.It is feasible to dynamically adjust the number of dewatering point wells.The proposed method is simple and reliable,the calculation content is less,and the reduction of the number of point wells significantly reduces the operation cost of precipitation,which has a certain reference significance for practical engineering.

关 键 词：基坑降水 停井方案 单井出水量 水位降深 

分 类 号：TU463[建筑科学—结构工程]