岩土力学2025，Vol.46Issue(5)：1455-1465,11.DOI:10.16285/j.rsm.2024.1011
膨胀土基泡沫轻质土力学性能试验研究
Experimental study on mechanical properties of expansive soil-based lightweight foam soil
摘要
Abstract
Expansive soil,a commonly distributed clay,is unsuitable for direct engineering applications.This study proposes a method to produce foam lightweight soil from expansive soil,effectively mitigating its expansive properties.The physical and mechanical properties of expansive soil-based lightweight soil(E-LS)were systematically investigated under varying water-solid ratios,wet densities,and expansive soil contents,using tests for flow value test,drying shrinkage test,pH test,and compressive strength test.An orthogonal experiment was conducted to quantify the influence of these factors on unconfined compressive strength(qu),leading to the development of a strength determination method.The results show that the preparation of E-LS modifies the expansive soil structure,completely eliminating its expansiveness.Compressive strength of E-LS increases with both wet density and curing age.For expansive soil contents ranging from 30％to 60％,the unconfined compressive strength at 28 days(qu-28 d)varied from 0.21 MPa to 1.58 MPa.Specifically,for E-LS with 50％expansive soil content,a water-to-solid ratio of 0.8,and a wet density of 900 kg/m3,the qu-28d reached 0.92 MPa,meeting the requirements for embankment construction.The factors affecting compressive strength are ranked as expansive soil content＞wet density＞water-solid ratio,and a predictive model for E-LS strength was developed.E-LS exhibits the capability to fulfill diverse embankment filling requirements in engineering applications,while demonstrating distinct advantages including expansive property mitigation,compaction-free implementation,and construction efficiency,thereby presenting significant potential for practical engineering deployment.关键词
膨胀土/泡沫轻质土/胀缩特性/力学性能/路基填料Key words
expansive soil/foam light soil/expansion and contraction characteristics/mechanical properties/subgrade filler soil分类
土木建筑引用本文复制引用
郑舒文,刘松玉,李迪,童立元,吴恺..膨胀土基泡沫轻质土力学性能试验研究[J].岩土力学,2025,46(5):1455-1465,11.基金项目
国家自然科学基金面上项目(No.52478388).This work was supported by the General Program of National Natural Science Foundation of China(52478388). （No.52478388）
