摘要
为研究不同止水帷幕深度下深基坑降水井出水流量的变化规律,以郑州地铁某车站深基坑降水为背景,利用有限元MIDAS GTS对不同止水帷幕深度下各种降水工况进行模拟,并重点分析降水井出水流量的变化规律。研究表明,止水帷幕插入潜水层的深度与降水井出水流量呈负相关,即降水井出水流量随着止水帷幕插入潜水层深度的增大逐渐减小,且贯穿止水帷幕后趋于稳定;当止水帷幕插入比介于0.44~0.625时,降水井出水流量的变化幅度随止水帷幕插入深度的增加逐渐减小;当止水帷幕插入比在0.625~0.875之间时,降水井出水流量近似线性的减小;当止水帷幕插入比大于0.875时,降水井出水流量降低的效果与完全隔断含水层的效果相近。综合考虑止水帷幕深度对降水井出水流量的影响及工程造价,止水帷幕插入比深度宜介于0.875~1之间。该研究成果可为郑州地铁车站深基坑止水帷幕优化提供理论指导。
In order to study the variation law of the outflow of the deep foundation pit dewatering well under different waterproof wall depths,based on the deep foundation pit precipitation of a station in Zhengzhou subway,the finite element MIDAS GTS is used to simulate various precipitation conditions under different waterproof curtain depths,and the variation law of water flow in precipitation wells is emphatically analyzed.Study proves that,the depth of the waterproof wall inserted into the phreatic layer is negatively correlated with the outflow of the dewatering well,that is,the outflow of the dewatering well decreases with the increase of the depth of the waterproof curtain inserted into the phreatic layer,and tends to be stable after the waterproof wall is penetrated;when the insertion ratio of the waterproof wall is between 0.44 and 0.625,the variation range of the outflow of the dewatering well decreases with the increase of the insertion depth of the waterproof wall;when the insertion ratio of waterproof wall is between 0.625 and 0.875,the outflow of dewatering well decreases approximately linearly;when the insertion ratio of waterproof wall is greater than 0.875,the effect of reducing the outflow of dewatering well is similar to that of completely isolating aquifer.Considering the influence of waterproof curtain depth on the outflow of precipitation wells and the engineering cost,the insertion depth of waterproof wall should be between 0.875 and 1.The research results can provide theoretical guidance for the optimization of deep foundation pit waterproof wall of Zhengzhou subway station.
作者
李龙
唐金召
左文州
李长印
李景丰
LI Long;TANG Jinzhao;ZUO Wenzhou;LI Changyin;LI Jingfeng(Sinohydro Bureau 11Co.,Ltd.,Sanmenxia 450001,China;School of Civil Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《粉煤灰综合利用》
CAS
2023年第5期13-19,共7页
Fly Ash Comprehensive Utilization
关键词
降水井
止水帷幕
插入比
MIDAS
GTS
foundation pit
dewatering wells
waterproof wall
insertion ratio
MIDAS GTS
