粉煤灰桩加固软基特性的室内试验研究
摘要:通过粉煤灰桩的室内模型试验，分析了粉煤灰桩的变形破坏特性、桩土应力的变化规律及其加固软土地基的作用机理。随着荷载的增加，桩间土应力逐渐增大，桩体应力增长较快，达到峰值时桩体屈服，复合地基开始发生破坏，桩体应力下降；桩土应力比随着荷载和时间的变化而变化，并与桩土模量比、桩的长径比有关，在桩基设计时应把桩土应力比作为一个变值来考虑。粉煤灰桩强度较高且透水性好，加固软基时其挤密作用、置换作用和时间效应都很显著，故粉煤灰桩是一种比较理想的柔性材料桩。
Abstract:By the indoor model test of flyash pile, the deformation and failure characteristics of flyash pile, the change pattern of pile and soil stress and the mechanism of flayash pile to reinforce soft foundation are analysed. Firstly, the soil stress increases gradually with the load increasing, and the pile body stress increases rapidly, the pile will yield and the composite foundation will begin to failure when the pile stress reaches the peak strength, then the stress will decrease after the peak strength; Secondly, the stress ratio of pile to soil changes with the load and time, and it is related to the pile soil modulus ratio and the length diameter ratio of pile. So the pile soil stress ratio should be considered a variable when the pile foundation is designed; Finally, because of the bigger strength and good permeability of flyash pile, its compacting and underpinning functions and time effect are all prominent when soft foundation reinforced. Therefore flyash pile is proved to be a kind of more suitable flexible material pile.
中文标题：
粉煤灰桩加固软基特性的室内试验研究
Laboratory Experimental Study on Soft Foundation Reinforced by Flyash Pile
作者：
顾强生1,张小平1,杨丽娟2
作者简介:顾强生,男,河海大学博士研究生,高级工程师。长期从事水利工程管理、建设和技术经济研究等工作。
通讯地址：
1. 河海大学, 南京 210098; 2. 盐城水利勘测设计院, 江苏盐城 224002
出版物：岩土工程技术
收稿日期:1998-07-27
网络出版日期:2021-08-03
关键词:粉煤灰桩,室内模型试验,桩土应力比,加固软基机理
Key words:flyash pile,laboratory model test,pile soil stress ratio,mechanism of reinforcing soft foundation
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