摘要
止水帷幕具有挡土和止水双重作用,当基坑坑壁分布有透水地层时,通常应考虑采用止水帷幕并达到坑底下一定深度,以封闭坑壁透水地层。当基坑场地地层为砾、卵石层时,受施工工艺和工程造价的限制,导致止水帷幕不能封闭坑壁砾、卵石层,从而形成短悬挂帷幕。为保证止水帷幕下地层的稳定,提出通过调整降水井布设方式,改变地下水渗流方向及非饱和区孔隙水压力梯度方向的方法,并以某工程为实例,采用数值模拟方法,分析坑外降水井布设对地下水渗流场的影响,确定了降水井布设方案。数值模拟结果与监测数据较为吻合,项目实施效果较好,因此,该方法可为类似基坑工程提供参考。
The water-stop curtain serves a dual function of earth retention and water stopping.When the foundation pit wall contains water-permeable strata,a water-stop curtain is typically used,extending to a certain depth below the bottom of the pit to seal off the water-permeable strata.In cases where the strata consist of gravel and pebble layers,construction limitations and project cost factors often prevent the water-stop curtain from effectively sealing these layers,resulting in a short suspended curtain.To ensure the stability of the strata beneath the water-stop curtain,a method is proposed that adjusts the layout of dewatering wells to change the direction of groundwater seepage and the pore water pressure gradient in the unsaturated zone.Using a project as an example,numerical simulation methods are applied to analyze the impact of dewatering well layout on the groundwater seepage field,leading to an optimized dewatering well arrangement.The numerical simulation results align well with monitoring data,and the project implementation shows favorable outcomes.This method can serve as a reference for similar foundation pit projects.
作者
曹芳
张娟
袁洪强
李勇
CAO Fang;ZHANG Juan;YUAN Hongqiang;LI Yong(Hubei Jianghan Construction Drawing Review Consulting Co.,Ltd.,Jingzhou 434000,Hubei,China;School of Urban Construction,Yangtze University,Jingzhou 434000,Hubei,China;Office of Campus Construction,Yangtze University,Jingzhou 434000,Hubei,China)
出处
《建筑施工》
2025年第2期287-290,共4页
Building Construction
基金
国家自然科学基金(51778064)。
关键词
短悬挂帷幕
基坑工程
地下水控制
数值模拟
降水井布设
short suspended curtain
foundation pit
groundwater control
numerical simulation
dewatering well layout
