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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。
Through the indoor model tests of fly ash piles, the deformation and failure characteristics of fly ash piles, the variation law of pile-soil stress, and the mechanism of strengthening the soft soil foundation are analyzed. With the increase of load, the soil stress between piles gradually increases and the stress of piles grows faster. When the peak value reaches the peak, the composite foundation begins to break and the pile body stress decreases; the pile-soil stress ratio changes with load and time. The change is related to the modulus ratio of piles and soils and the aspect ratio of piles. The pile-soil stress ratio should be considered as a variable value in the design of pile foundations. The fly ash pile has high strength and good water permeability. When the soft foundation is reinforced, its compaction, displacement and time effects are all significant, so the fly ash pile is an ideal flexible material pile.