高频免共振钢管桩承载力恢复规律预测模型

Predictive Model for the Load-Bearing Capacity Recovery Pattern of High-Frequency Non-Resonant Steel Pipe Piles

高频免共振钢管桩因其施工效率高、泥浆污染小、对周边环境影响小等优点而被广泛应用。免共振沉桩原理是使桩周土体液化,产生的超孔隙水压力会导致桩承载力下降,且恢复缓慢。现依托上海杨高中路改建工程,通过现场孔压监测与高应变试验,分析了桩周孔压消散规律与桩承载力恢复规律,并提出了基于孔隙水压力的归一化桩承载力恢复预测模型,为相似工程应用提供技术支持和经验参考。

The high-frequency non-resonant steel pipe piles are widely applied due to the advantages such as high construction efficiency,minimal slurry pollution,and minimal impact on the surrounding environment.However,the principle of non-resonant pile driving causes liquefaction of the soil around the pile,resulting in an increase in excess pore water pressure that leads to a decrease in pile-bearing capacity and slow recovery.This paper is based on the reconstruction project of Yanggao Middle Road in Shanghai.Through on-site pore pressure monitoring and high-strain testing,the dissipation pattern of pore pressure around the pile and the recovery pattern of pile-bearing capacity are analyzed.Additionally,a normalized predictive model for pile-bearing capacity recovery based on the pore water pressure is proposed.This research provides technical support and empirical reference for similar engineering applications.