北京建筑大学学报2025，Vol.41Issue(1)：82-91,10.DOI:10.19740/j.2096-9872.2025.01.09
既有地铁隧道上覆深大基坑中抗拔桩优化分析
Optimization Analysis of Anti-Pulling Piles in Deep Foundation Pit Overlying Existing Subway Tunnel
摘要
Abstract
In order to address the issue of large displacement of the existing subway tunnel under a deep foundation pit during excavation and explore the optimal anti-pulling pile scheme,a numerical simulation method combined with monitoring and analysis was employed in the reconstruction project of a stadium in Beijing.The foundation pit construction was simulated using MIDAS software,and the calculated results were compared with monitoring data to validate the model and parameters.Single factor optimization of pile length,diameter,and spacing was conducted,followed by significance analysis of their impact on existing tunnel deformation.Multi-factor optimization analysis was then performed based on the most significant factors.Results indicated that during foundation pit excavation,soil on the surface rose and then sank,while the subway tunnel rose.For the pull-out piles,the optimal scheme involved reducing pile length by 2 m and maintaining pile diameter or increasing spacing by 1 m under single factor influence.Pile spacing and length had significant effects on tunnel displacement,while diameter did not.The proposed multi-factor model accurately reflected the relationship between uplift parameters and maximum tunnel displacement,with good predictive ability.The relationship between pile length and spacing obtained from 3D surface projection can be used to assess tunnel safety in this project.关键词
深大基坑/数值模拟/抗拔桩优化/既有隧道Key words
deep large foundation pit/numerical simulation/anti pulling pile optimization/subway tunnel分类
土木建筑引用本文复制引用
陈涵宇,彭丽云,刘兵科,陶畅..既有地铁隧道上覆深大基坑中抗拔桩优化分析[J].北京建筑大学学报,2025,41(1):82-91,10.基金项目
国家自然科学基金项目(42172299). （42172299）
