循环荷载下粉煤灰群桩复合地基承载性能试验研究

文章摘要

循环荷载下粉煤灰群桩复合地基承载性能试验研究

Experimental study on bearing capacity of fly ash pile group composite foundation under cyclic load

投稿时间：2023-06-29 修订日期：2023-06-29

DOI：

中文关键词: 循环荷载模型试验复合地基承载特性桩土应力比

英文关键词: cyclic load model test composite foundation bearing characteristics Pile-soil stress ratio

基金项目:安徽省建筑科学研究设计院(NO.2022-JKYL-006.);

作者	单位	邮编
周盛全^*	安徽理工大学	232001
徐秋伟	安徽理工大学土木建筑学院
戴晨	安徽理工大学土木建筑学院
冯绍童	安徽理工大学土木建筑学院

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中文摘要:

通过开展粉煤灰群桩复合地基在循环荷载作用下的室内模型试验,从桩顶累积沉降、桩身应力、桩间粉煤灰应力、桩土应力比等方面出发,研究了循环荷载作用下循环次数、循环幅值等因素对粉煤灰群桩复合地基的承载特性的影响。结果表明：循环荷载作用下,桩顶累积沉降与循环幅值呈现非线性增长关系,并在不同循环荷载比下可分为稳定型和发展型2种类型；桩身及桩间粉煤灰应力均呈现先增长后稳定的趋势,但两者应力增量最大处的位置却截然相反；当加载次数跨越临界次数,桩土应力比大幅降低的变化速率将出现收敛；循环幅值的增加,会引起土拱效应的不完全发挥,威胁土拱效应的稳定性。

英文摘要:

Based on the laboratory model test of fly ash pile group composite foundation under cyclic load, the effects of cyclic load on the bearing characteristics of fly ash pile group composite foundation are studied from the aspects of pile top cumulative settlement, pile body stress, inter-pile fly ash stress, pile-soil stress ratio, etc. The results show that the cumulative settlement of pile top presents a nonlinear growth relationship with the cyclic amplitude under cyclic load, and can be divided into two types under different cyclic load ratios: stable type and developing type. The fly ash stress of pile body and between piles increases first and then stabilizes, but the position of the largest stress increment is completely opposite. When the loading times exceed the critical times, the change rate of the pile-soil stress ratio will converge. The increase of cyclic amplitude will cause the incomplete play of soil arch effect and threaten the stability of soil arch effect.

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