桩柱式基础的屈曲机理及稳定分析

论述了桩柱式基础的屈曲稳定的影响因素,基于能量法分析河床下切对桩基稳定性的影响,建立了将桩和柱视为一个整体的分析计算模型。以广东茂名下郭大桥工程为实例,分析河床下切对桩柱式基础的稳定性。计算表明:增加对桩柱的约束长度比提高地基土的性能对提高稳定性效果会更好;对于河床下切严重的桩柱式基础,提高桩侧土的性能对改善桩柱结构的稳定性能效果不是很明显。

Analysis on Buckling Mechanism and Stabilization of Pile-volume Foundation

The article discusses the influence factor of buckling stabilization of pile-volume foundation,analyzes the influence of riverbed entrenchment on the stabilization of pile foundation,and sets up the analysis computation model of pile and volume shown as a whole.The article analyzes the stabilization of riverbed entrenchment on the pile-volume foundation by the practical case of Guangdong Maoming Xiaguo Bridge Project.The computation shows that the increment of pile volume constraint length is better to improve the stability effect than the improvement of subgrade soil performance,and the improvement of pile-side soil performance is not obvious to improve the stability performance of pile-volume structure for the serious pile-volume foundation of riverbed entrenchment.