软土地区某阶梯式深基坑变形监测与数值模拟  

Deformation Monitoring and Numerical Simulation of a Stepped Deep Foundation Pit in Soft Soil Area

作　　者：李程 贾战磊 徐成皓 Li Cheng;Jia Zhanlei;Xu Chenghao(Jiangsu Geotechnical Engineering Survey and Design Institute,Zhenjiang 212021,China;College of Civil Engineering and Architecture,Jiangsu University of Science and Technology,Zhenjiang 212003,China)

机构地区：[1]江苏省岩土工程勘察设计研究院,江苏镇江212021 [2]江苏科技大学土木工程与建筑学院,江苏镇江212003

出　　处：《石家庄铁道大学学报（自然科学版）》2023年第4期61-68,共8页Journal of Shijiazhuang Tiedao University(Natural Science Edition)

摘　　要：软土区深基坑的支护结构在基坑开挖时容易变形破坏造成安全事故。以镇江市软土区深基坑工程为研究对象,探讨了阶梯式支护结构的变形规律。通过现场实测和数值模拟对阶梯式支护结构进行综合分析,重点对比了支护桩位移结果。结果表明,模型计算结果与现场实测数据基本一致,可以准确地反映支护结构的变形规律;在开挖过程中,基坑中部支护桩的水平位移最大,桩顶最大水平位移为33.4 mm,并且水平位移沿桩身呈“弓形”变形模式;通过对比基坑南北两侧结果,发现采用阶梯式支护结构可以很好地控制支护桩的水平位移。The support structure of deep foundation pits in soft soil area is prone to deformation and failure during excavation,leading to potential safety accidents.Taking the deep foundation pit project in the soft soil area of Zhenjiang city as the research target,the deformation law of the stepped support structure was investigated.Through on-site measurement and numerical simulation,a comprehensive analysis was conducted on the stepped support structure,with a particular focus on comparing the displacement results of the support piles.The results shows that the computed results closely align with the actual field data,accurately reflecting the deformation patterns of the support structure.During the excavation process,the highest horizontal displacement of support piles can be observed in the middle of the foundation pit,with a maximum of 33.4 mm at the top of the pile.Moreover,the horizontal displacement presents a“bow-shaped”deformation pattern along the pile body.By comparing the deformation results from the north and south sides of the foundation pit,it can be observed that the implementation of the stepped support structure effectively regulates the horizontal displacement of the support piles.

关 键 词：深基坑 阶梯式支护结构 基坑监测 数值模拟 位移 

分 类 号：TU473[建筑科学—结构工程]