摘要
紧邻既有地铁设施的深基坑工程在基坑开挖过程中,可能由于土体的卸荷作用而引起周边土体位移,进而带动地铁设施产生变形。本文以杭州地铁16号线八百里站C号、D号出入口旁侧某房地产开发项目地下室基坑工程为例,通过有限元数值分析软件建立二维、三维模型,针对基坑开挖对邻近既有地铁天桥及出入口的影响进行数值模拟分析,预测基坑变形,分析基坑开挖过程中邻近既有地铁天桥与出入口的位移响应,重点分析基坑开挖至坑底及拆换撑工况下地铁设施的位移场,并总结主要测项的变化规律,进行变形趋势分析。数值模拟计算结果与地铁变形监测数据表明,基坑施工对地铁设施的影响较小,满足轨道交通结构变形控制值要求。
During the excavation process of deep foundation pits adjacent to existing subway facilities,the unloading effect of soil may cause displacement of surrounding soil,potentially resulting in deformations of the adjacent subway facilities.This work presents a case study of a basement foundation pit project located near the C and D entrances and exits of Babaili station on Hangzhou Metro Line 16.Both two-dimensional and three-dimensional finite element models were established using numerical analysis software.Numerical simulations were performed to analyze the impact of foundation pit excavation on nearby subway overpasses and entrances/exits.The study predicts the deformation of the foundation pit and analyzes the displacement response of nearby subway overpasses and entrances/exits during the excavation process.Specifically,it examines the displacement field of subway facilities during excavation to the bottom of pit and the subsequent dismantling and replacement of supports.Additionally,variations in key measurement parameters were summarized to analyze deformation trends.The numerical simulations and the results from subway deformation monitoring all indicate that the foundation pit construction has a negligible impact on the subway facilities,and meeting the deformation control criteria for rail transit structures.
作者
赖小勇
吴荣本
李慧慧
LAI Xiao-yong;WU Rong-ben;LI Hui-hui(Hangzhou Geotechnical Engineering and Surveying Research Institute with Limited Liability,Hangzhou 310012,Zhejiang,China)
出处
《地基处理》
2023年第S01期6-13,共8页
Journal of Ground Improvement
关键词
深基坑开挖
地铁
天桥
出入口
有限元
影响分析
deep foundation pit excavation
subway
overpass
entrance and exit
finite element analysis
impact analysis
作者简介
赖小勇(1986—),男,江西赣州人,硕士,高级工程师,主要从事岩土工程设计、咨询及地铁安全评估工作。E-mail:442805134@qq.com。
