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    • Model Test of Bearing Characteristics of Fly Ash Foundation under Cyclic Loading

    Shengquan Zhou,Haojin Zhang,Rui Wang,Dongwei Li

    Processes（2022）SCI 4区SCI 3区

    Anhui Univ Sci & Technol | East China Univ Technol

    Cited 1|Views4
    Abstract
    Based on the vertical cyclic model test of the cement-fly ash mixing pile (CFMP) composite foundation, the effects of different dynamic load ratios on the long-term bearing characteristics of the composite foundation were studied. From the perspectives of foundation cumulative settlement, dynamic stiffness, pile axial force, and pile lateral friction, etc., the bearing mechanism of the CFMP fly ash composite foundation under cyclic load was investigated. By virtue of the assay herein, the authors discovered that the cumulative settlement under different load ratios exhibited the “threshold effect”, which could be divided into the attenuation type and destruction type. When the peak value of the cyclic load was close to the ultimate bearing capacity, the dynamic failure of the pile foundation occurred. The cyclic displacement ratio ranged from 1.05 to 1.23, satisfying the relation of quadratic equation. The cyclic load settlement could be predicted by the static load displacement. During cyclic loading, the proportion of the pile side sharing the upper load decreased persistently, and the fatigue degradation of side friction resistance occurred. The degradation could be alleviated by reducing the water content of fly ash and taking waterproof measures during construction.
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    Key words
    model test,cyclic load,composite foundation,cumulative settlement,bearing characteristics,fatigue degradation
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    【要点】：本研究通过模型测试探讨了不同动态负载比对水泥粉煤灰混合桩（CFMP）复合地基在循环加载下的长期承载特性影响，并提出了一种新的循环负载下地基沉降预测方法。
    

    【方法】：研究采用垂直循环模型测试方法，对CFMP复合地基在循环加载下的承载机制进行分析，考察了基础累积沉降、动态刚度、桩轴力及桩侧摩阻力等多个方面的表现。
    

    【实验】：通过实验发现，不同负载比下的累积沉降表现出“阈值效应”，分为衰减型和破坏型；当循环负载峰值接近极限承载力时，桩基发生动态破坏。实验使用了特定的数据集，但未提及数据集具体名称，结果显示循环位移比在1.05到1.23之间，符合二次方程关系，且循环加载下桩侧分担的上部载荷比例持续减少，侧摩阻力发生疲劳降解，通过降低粉煤灰含水率和施工中采取防水措施可以减轻降解。