堆土空腔对大桥基础影响有限元分析及监测

Numerical Calculation and Monitoring Analysis of Bridge Pile-cap under Building and Surcharge Load

以上海黄浦江某堆土空腔景观提升改造工程项目为背景,建立了堆土空腔坡地对大桥桩基承台影响三维固结数值计算模型。通过与现场监测数据的对比分析验证了数值模型合理性,并对施工和固结过程影响、不同深度和距离下承台变形规律及轻质材料换填的影响进行了总结。结果表明:施工期主桥墩和引桥墩承台最大沉降分别为1.29 mm和1 mm,固结两年后主桥墩和引桥墩承台最大沉降增加到2.33 mm和1.80 mm,变形速率分别为1.35×10^-3mm/d和1.49×10^-3mm/d,变形已基本稳定;主桥墩和引桥墩承台变形随深度的分布变化趋势相同且均较为稳定;轻质材料换填工况下施工期主桥墩和引桥墩沉降减少分别约53.2%和19%,固结两年后主桥墩和引桥墩沉降减少分别约42.3%和20.7%。

Based on the building and surcharge load of landscape improvement project at Huang-Pu River,Shanghai,the three-dimensional(3 D) consolidation numerical model of the deformation influence on pile-cap under building and surcharge load was established. The rationality of analytical method was verified by the field measured results,meanwhile,the influence of the construction and consolidation process,the cap deformation law of different depth and distance,the effect of light material replacement were summarized. The results show that the maximum pile cap settlement of main pier and assist pier were respectively 1.29 mm and 1 mm;then increased to 2.33 mm and 1.80 mm after two years of consolidation,and the rate of deformation were respectively 1.35× 10^-3 mm/d and 1.49× 10^-3 mm/d,the deformation has basically stabilized;Moreover,the deformation of the main pier and the bridge pier is the same and stable with the distribution of depth. light material replacement can effectively reduce the deformation of adjacent buildings.