冠梁对弧形悬臂式排桩围护结构变形的影响

针对不同工况条件下冠梁对悬臂式排桩围护结构变形的影响,采用数值分析和现场监测相结合的手段进行分析。结果表明:冠梁对悬臂式排桩围护结构变形的约束效果显著;随着基坑开挖深度增加,冠梁的约束作用显著增大,开挖到一定深度时必须通过设置冠梁来控制围护结构变形;增加冠梁约束后,围护结构变形对基坑形状变化较敏感,在弧形基坑中冠梁的约束作用更加显著。

Effect of crown beam on deformation of arc cantilever row pile enclosure structure

The influence of crown beam on the deformation of retaining structure of cantilever row piles under different conditions is analyzed by means of combination of numerical analysis and field monitoring.The results show that crown beam can improve the deformation restraint of cantilever row pile retaining structure significantly.With the increase of excavation depth of foundation pit,the restraint effect of crown beam becomes more and more significant.When excavation reaches a certain depth,the deformation of enclosure structure must be controlled by setting crown and beam.After the setting of crown beam restraint,the deformation of retaining structure is more sensitive to the shape change foundation pit,and the restraint effect of crown beam is more significant in arc foundation pit.