摘要
以深圳某地铁深基坑开挖工程为例,应用渗流分析基坑止水帷幕底端所处地层不同时对基坑外侧地下水位下降的影响。研究表明,基坑止水帷幕底部进入的土层透水性质不同对外侧地下水位下降影响差别较大,当基坑止水帷幕应全部进入相对不透水层,才能确保防止因降水渗流影响而导致的基坑外侧大量失水。通过对土体可能产生的固结沉降做进一步分析计算,为控制由基坑降水带来的沉降变形风险提供依据和判断。
In this paper,a case study of the seepage influence analysis is presented considering different cut-off wall depths at a subway deep excavation project in Shenzhen.The two dimensional numerical analysis results indicate that,the groundwater drawdown outside the excavation area depends on the permeability coefficient of the soil layers at the toe of the cut-off wall.The loss of groundwater could be minimized when the tow of the cut-off wall is penetrated into the impervious layers.Further assessment of the potential ground subsidence induced by the groundwater extraction could be referred as the early prediction and judgement for the deep excavation risk control.
作者
闻家明
李荣生
李红
高伟
熊健
WEN Jiaming;LI Rongsheng;LI Hong;GAO Wei;XIONG Jian(Shenzhen Qianhai Development and Investment Co.Ltd.,Shenzhen 518028;CIGIS(China)Ltd.,Shenzhen 518028)
出处
《土工基础》
2021年第4期445-448,共4页
Soil Engineering and Foundation
关键词
地铁基坑
止水帷幕
渗流
SEEP/W
沉降
Subway Excavation
Cut-Off Wall
Seepage
SEEP/W
Ground Subsidence
