地聚合物搅拌桩加固软黄土地基试验研究

Experimental Study on Soft Loess Foundation Reinforced by Geopolymer Mixing Piles

基于新疆G577公路项目高含水率软黄土试验土样,采用室内模型试验和数值模拟的方法,进行地聚合物搅拌桩复合地基承载特性的试验研究。结果表明:地聚合物桩体可有效控制复合地基沉降,其沉降随着置换率的增加而逐渐降低;桩间土应力在每级荷载施加的瞬间会显著增加,随后在每级荷载持续的过程中逐渐减小至平稳;而桩顶应力在每级荷载施加的瞬间会略微增加,随后在每级荷载持续的过程中线性增加;桩土应力比n总体呈逐渐减小至平稳的趋势,且最终稳定于7~8;相比置换率,桩长对复合地基沉降影响更大,建议当沉降量较大不能满足设计要求时,宜优先考虑增加桩长。

Based on the high moisture content soft loess test soil sample of G577 highway project in Xinjiang,the laboratory model test and numerical simulation metholds were used to carry out the study the bearing characteristics of geopolymer mixed pile composite foundation.The results show that,geopolymer piles can effectively control settlement of composite foundation,and the settlement gradually decreases with the increase of replacement rate;the soil stress between piles will significantly increase at the moment when each load is applied,and then gradually decrease to a stable state during each load duration;the stress at the pile head will slightly increase at the moment when each load is applied,and then linearly increase during each load duration;the pile-soil stress ratio n generally presents a trend of gradually decreasing until stable,and ultimately stabilizes at 7-8;compared with the replacement rate,the pile length has greater impact on settlement of composite foundation.It is recommended that increasing pile length is considered firstly when the settlement is large and cannotmeet the design requirement.