摘要
针对基坑降水引起周边环境变形的问题,为有效评价基坑降水对邻近地铁隧道安全的影响及降水方案的可行性,结合某基坑工程,分别采用渗流计算软件与有限元软件计算基坑降水引起的浸润线与附加沉降,分4种工况分析基坑开挖水位变化对邻近地铁产生的影响。结果表明:当止水帷幕完全不漏水,将止水帷幕设置于坑底下11 m时,基坑开挖降水引起邻近地铁隧道产生的最大横向变形仅为1.99 mm;当止水帷幕设置于坑底下11 m,降水至坑底下14 m时,基坑开挖降水引起邻近地铁隧道产生的最大竖向变形为9.85 mm,最大附加弯矩为47.60 kN·m,最大附加剪力为37.75 kN;4种工况下基坑开挖降水引起邻近地铁隧道产生的竖向变形均略大于4 mm,均不满足地铁运营线路轨道变形在±4 mm内的要求,会对邻近地铁运营安全造成一定影响。
Regauding the problem of the surrounding environment deformation caused by foundation pit dewatering,in order to effectively evaluate the safety impact of foundation pit dewatering on adjacent subway tunnels and the feasibility of precipitation scheme,combined with a project of foundation pit,the saturation line caused by dewatering of foundation pit is calculated by the seepage calculation software and the additional settlement caused by dewatering of foundation pit is calculated by the finite element software.The coupled analysis of the deformation and seepage is conducted,including the influence of the excavation and water level change for foundation pit on the adjacent subway under four dewatering conditions.The results show that when the waterproof curtain is completely waterproof,and it will be set to the bottom under the foundation pit of 11 m,the maximum lateral deformation of the adjacent metro tunnel caused by the dewatering of foundation pit excavation is 1.99 mm.When the waterproof curtain is set to the bottom under foundation pit of 11 m,and dewatering to the bottom 14 m under foundation pit,the maximum vertical deformation of the adjacent metro tunnel caused by the dewatering of foundation pit excavation is 9.85 mm,the maximum additional moment is 47.60 kN·m and the maximum additional shear is 37.75 kN for the adjacent metro tunnel caused by the dewatering of foundation pit excavation.The vertical deformation of the adjacent metro tunnel caused by the dewatering of foundation pit excavation are slightly larger than 4 mm under four dewatering conditions,which is not satisfied the subway track deformation requirement within the range of±4 mm,and will have some impact on the operation safety of the adjacent subway.
作者
李延沛
张明
何将福
LI Yanpei;ZHANG Ming;HE Jiangfu(College of Civil Engineering,Henan University of Engineering,Zhengzhou 451191,China)
出处
《河南工程学院学报(自然科学版)》
2025年第2期25-31,共7页
Journal of Henan University of Engineering:Natural Science Edition
基金
河南省科技发展计划项目(182102310003)
2024年河南工程学院开放实验项目(HKJ2024078)。
关键词
基坑
降水
地铁
有限元
渗流变形
foundation pit
dewatering
subway
finite element
seepage and deformation
