摘要
泡沫轻质土是路堤重要填料,但是大体积泡沫轻质土存在干缩变形大、强度不足等问题。利用黄河下游粉砂土作为细集料生产泡沫轻质土,通过试验分析不同设计湿密度下粉砂土掺量对流值、抗压强度、干缩率和耐久性的影响,并通过数值模拟分析其微观结构与力学性能的关系。结果表明:随着粉砂土掺量的增大,泡沫轻质土28 d抗压强度降低;根据规范结合工程实例和试验结果,推荐泡沫轻质土作为路基填料时粉砂土掺量取20%~30%;泡沫轻质土的干缩率随粉砂土掺量的增大而减小;粉砂土的加入能减少泡沫轻质土中水和水泥用量,扩大微观结构孔径分布范围。
Foam lightweight soil is important filler for road embankment,but there are problems such as large dry shrinkage deformation and insufficient strength of large volume foam lightweight soil.Foam lightweight soil was produced by using silt soil from the lower reaches of the Yellow River as fine aggregate.The effects of silt soil content under different design wet densities on the flow value,compressive strength,dry shrinkage rate and durability were analyzed through experiments,and the relationship between its microstructure and mechanical properties was analyzed through numerical simulation.The results show that as the silt soil content increases,the 28-day compressive strength of foamed lightweight soil decreases.According to the existing specifications,combined with engineering examples and test results,foam lightweight soil is recommended as the sub-grade filler.The mixing ratio of silt soil is 20%-30%,and the dry shrinkage rate of foam lightweight soil decreases with the increase of the mixing ratio of silt soil.Observing the microstructure,it is found that the addition of silt soil can expand the pore distribution range of lightweight soil.
作者
张婧
徐少辉
王帅
谢炳坤
王浩
赵显昊
ZHANG Jing;XU Shaohui;WANG Shuai;XIE Bingkun;WANG Hao;ZHAO Xianhao(Henan Natural Resources Monitoring and Land Consolidation Institute,Zhengzhou 450016,China;School of Civil Engineering and Architecture,Henan University,Kaifeng 475004,China)
出处
《人民黄河》
北大核心
2025年第6期156-160,共5页
Yellow River
基金
河南省科技攻关项目(242102321007,242102321012)。
关键词
泡沫轻质土
粉砂土
性能试验
微观结构
黄河下游
foamed lightweight soil
silt soil
performance testing
microstructure
Lower Yellow River
