干湿循环对粉质黏土持水特性的影响研究  

Study on the Influence of Dry-wet Cycle on the Water Holding Properties of Silty Clay

作　　者：朱禹洋 李果 徐子涵 郑诚 ZHU Yu-yang;LI Guo;XU Zi-han;ZHENG Cheng(Zhejiang East China Engineering Consulting Co.,Ltd.,Hangzhou,Zhejiang,311122,China)

机构地区：[1]浙江华东工程咨询有限公司,浙江杭州311122

出　　处：《建材技术与应用》2024年第5期28-32,共5页Research and Application of Building Materials

摘　　要：以粉质黏土为研究对象,开展不同干湿循环次数下的压力板法试验,研究干湿循环对土体持水特性的影响。采用核磁共振测量土体内部的孔径分布情况,以分析干湿循环对土体持水特性的机理。试验结果表明:随着干湿循环次数的增加,试样饱和体积不断降低而干燥体积略微增长,干燥和饱和后的体积变化幅度不断减小,试样的持水能力不断降低;核磁结果显示,粉质黏土试样的孔隙呈双峰结构,随着干湿循环次数的增加,大孔隙结构占比不断增加,其持水能力越低;采用两种持水模型对试验结果进行拟合,两者拟合度R 2>0.99。Taking silty clay as the research object,pressure plate experiments were carried out under different wet and dry cycles to study the effects of wet and dry cycles on the water holding characteristics of soil.Nuclear magnetic resonance(NMR)was used to measure the pore size distribution in the soil to analyze the mechanism of dry-wet cycling on the water holding property of the soil.The experimental results show that the saturated volume of the sample decreases and the dry volume increases slightly with the increase of the number of dry-wet cycles.The volume change range after drying and saturation decreases,and the water holding capacity of the sample decreases.The results of NMR showed that the pores of silty clay samples had a bimodal structure.With the increase of wet-dry cycles,the proportion of macropores increased,and the water holding capacity decreased.Two water-holding models were used to fit the test results,and the goodness of fit R 2 was greater than 0.99.

关 键 词：粉质黏土 干湿循环 持水特性 核磁共振 

分 类 号：TU41[建筑科学—岩土工程]