自重对桩柱式高桥墩桩基稳定性的影响

Influence of Sole Weight on Stability of Pile Foundation with Pile-Column Type Higher-Bridge Pier

基于桩柱式高桥墩桩基与一般桩基的差异,以及高桥墩桩基中桩、墩和土体共同工作的原理,建立了将桩基和墩视为一个整体的分析计算模型。计算结果表明,当桩身埋置率较小时,自重对屈曲稳定性的影响较显著,对于高桥墩桩基,由于其地面上部分长度较大,埋置率通常较小,尤其在其施工阶段,应考虑自重对其屈曲稳定的不利影响。

Based on the difference of pile - column type higher bridge pier from ordinary pile foundation as well as on the principles working together pile, pier and soil, a analysis - calculation model taking the pile foundation with pier as integraty is establishod. Calculating results manifest as depth of imbedded pile is minor, its sole weight has a prominent influence on its flexion. For pile -foundation with higher bridge pier, thanks to the pile length of upper part from ground surface is longger, the imbedded depth of pile is usually smaller, accordingly at construction stage, it must be consided that sole weight of pile will be unfavourable on its flexion.