富水砂层基坑开挖降水对地铁车站影响分析  

Analysis on the influence of water sand foundation pit excavation dewatering on subway station

作　　者：赵晨阳 ZHAO Chenyang(New-type Rail Transit Design and Research Institute of China Siyuan Survey and Design Group Co.,Ltd.,Suzhou 215011)

机构地区：[1]中铁四院集团新型轨道交通设计研究有限公司,苏州215011

出　　处：《铁道勘测与设计》2022年第4期78-81,87,共5页Railway Survey and Design

摘　　要：南通市地处长江下游冲积平原,浅层以砂性地层为主,局部夹杂粘性土层,富存潜水及承压水。本文以南通市某停车楼工程基坑开挖降水对南通轨道交通1号线盘香路站的影响分析为例,研究了富水砂层地质条件下基坑开挖、降水对既有地铁车站结构的影响,研究表明该类地层基坑降水导致结构变形占总变形的80%,且影响范围大,需要在设计上重视止水帷幕设计,施工过程中严格控制降水量,并加强水位监测。Nantong city is located in the alluvial plain on the lower reaches of the Yangtze River.The shallow layer is mainly sandy stratum,partially mixed with viscous soil layer,rich in phreatic and confined water.Based on the analysis of the influence of foundation pit excavation and dewatering of parking buildings located in the north of Chongchuan Road and west of Panxiang Road on panxiang Road station of Nantong Rail transit Line 1,this paper studies the influence of foundation pit excavation and dewatering on the existing subway station structure under the geological condition of water-rich sand layer.The research shows that the structural deformation caused by dewatering of this kind of foundation pit accounts for 80%of the total deformation,and the influence range is large.It is necessary to attach importance to the design of water stop curtain,strictly control precipitation in the construction process,and strengthen the monitoring of water level.

关 键 词：富水砂层 基坑开挖 降水 地铁结构 变形 

分 类 号：TU7[建筑科学—建筑技术科学]