摘要
以南京市南部新城地下空间工程为例,利用Plaxis 3D软件进行数值模拟,探讨坑中坑开挖深度比对异形深基坑变形特性的影响。通过与实际测量数据对比,发现基坑周边地表沉降曲线与围护结构深层水平位移曲线整体变化趋势高度一致,从而验证了数值模型的可靠性。结果表明,深度比显著影响基坑变形,深度比增大,异形深基坑变形随之增大,究其原因为坑中坑开挖基坑侧向土体应力被释放,导致围护结构被动土压力减小,被动土压力合力作用点降低,致使基坑变形增大。
This study,based on the underground space engineering project in the southern new town of Nanjing,utilized Plaxis 3D software to simulate the impact of the pit-in-pit excavation depth ratio on the deformation characteristics of irregular-shaped deep foundations.By comparing numerical simulation results with actual measurement data,it was found that the overall trends of surface settlement curve around the foundation pit is highly consistent with the deep horizontal displacement curve of the retaining structure,thus verifying the reliability of the numerical model.The findings indicate that the depth ratio significantly influences the deformation of the foundation pit.As the depth ratio increases,the deformation of the irregular deep foundation pit also increases.The reason for this is that the lateral soil stress of the pit-in-pit excavation is released,resulting in a decrease in the dynamic earth pressure on the retaining structure.The application point of resultant force of passive earth pressure decreases,resulting in increased deformation of the foundation pit.
作者
李飞
LI Fei(Jiangsu Command Department of China Railway 15th Bureau Group Co.Ltd.,Nanjing Jiangsu 211100,China)
出处
《铁道建筑技术》
2024年第10期197-199,230,共4页
Railway Construction Technology
基金
中国铁建股份有限公司科技研究开发计划项目(2022-C14)
中铁十五局集团有限公司科技研发计划项目(2022A4,2021C61)。
关键词
坑中坑
异形深基坑
地表沉降
深度比
数值模拟
pit-in-pit
irregular-shaped deep foundation pit
ground settlement
depth ratio
numerical simulation
作者简介
李飞(1979-),男,河南滑县人,高级工程师,主要从事隧道与地下工程方面的工作,E-mail:9613701@qq.com。
