锚碇深基坑施工过程数值模拟及安全监测研究

Numerical Simulation and Monitoring Study on Construction Process of Deep Foundation Excavation of Anchorage

以非洲马普托大桥南侧锚碇深基坑项目为依托,运用FLAC^(3D)对深基坑开挖全过程进行了前期分析,预测了基坑围护结构及周边土体的变形规律。根据数值模拟结果,对监测方案进行优化并开展基坑施工阶段安全监测,得到基坑围护结构变形、周边建筑物沉降、周边土体位移等实测数据。将数值计算结果与现场实测数据进行对比和分析,结果表明:FLAC^(3D)计算所得墙体最大变形位置及最大位移值与后期现场实测数据吻合良好,对周边土体沉降最大位置的预测是准确的,表明建模及土体参数取值基本合理,对围护结构整体变形规律及周边土体的位移场规律预分析模拟精度较高。

Based on the deep excavation project of the Katembe side anchorage foundation of Maputo Bridge in Africa,FLAC^（3D）was used to analyze the whole process of deep excavation and predicted the deformation of retaining structure and surrounding soil. According to the numerical simulation results,the monitoring plan is optimized and the safety monitoring of the foundation excavation construction stage is conducted. The field data such as the deformation of retaining structure,the settlement of the surrounding buildings and the surrounding soil displacement are obtained. The numerical results are compared with the field data,and the results show that the simulation results of maximum deformation position and the maximum displacement value of the wall are in good agreement with the field data,and the prediction of the maximum settlement of the surrounding soil is accurate. It shows that the modelling and soil parameters of simulation are reasonable,and the simulation precision of retaining structure deformation and surrounding soil displacement is high.