软土路基泡沫轻质土分层填筑沉降分析及参数影响研究

Settlement Analysis and Parameter Influence Study of Layered Filling With Foam Light Soil for Soft Soil Subgrade

为研究泡沫轻质土在软土路基分层置换填筑时的沉降规律,基于Abaqus数值计算平台建立了泡沫轻质土分层填筑路基的有限元模型,分析了不同填筑阶段路基沉降的规律,并对泡沫轻质土相关参数展开研究,探讨了不同参数变化对路基沉降的影响规律。计算结果表明:不同填筑阶段路基顶面沉降均呈马鞍形分布;路基最大沉降区域位于第一层与第二层泡沫轻质土之间;弹性模量和泊松比与路基中线沉降量呈负相关关系;粘聚力变化对路基沉降无显著影响。

In order to study the settlement law of foam lightweight soil in the layered replacement of soft soil subgrade, a finite element model of layered subgrade filling with foamed lightweight soil was established based on the Abaqus numerical calculation platform, and the settlement of subgrade in different filling stages was analyzed.The relevant parameters of foam lightweight soil were studied, and the influence of different parameter changes on the settlement of subgrade was discussed.The calculation results show that the settlement of the top surface of the subgrade in different filling stages is distributed in a saddle shape;the maximum settlement area of the subgrade is located between the first layer and the second layer of foam light soil;the elastic modulus and Poisson’s ratio are negative with the settlement of the subgrade centerline.Correlation cohesion change has no significant effect on subgrade settlement.