干湿循环与竖向应力作用下非饱和红砂岩土土水特性研究  

Study on soil-water characteristics of unsaturated red sandstonesoil under dry-wet cycles and vertical stress

作　　者：罗鹏 LUO Peng(School of Civil Engineering and Surveying and Mapping Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)

机构地区：[1]江西理工大学土木与测绘工程学院,江西赣州341000

出　　处：《贵州科学》2025年第2期81-85,共5页Guizhou Science

基　　金：江西省“双千计划”创新领军人才项目(JXSQ2021003)。

摘　　要：为研究非饱和红砂岩土持水特性在干湿循环和竖向应力作用下的变化规律,采用压力板仪测定了不同干湿循环次数和不同竖向应力状态下非饱和红砂岩土的土-水特征曲线(SWCC),分析了非饱和红砂岩土土-水特征曲线的进气值与残余含水率等特征值的变化规律,给出了对应的土-水特征曲线。结果表明:干湿循环与竖向应力对非饱和红砂岩土的土水特性有较大影响,随干湿循环次数的增多,土的进气值逐渐减小,饱和体积含水率减小,持水能力也逐渐减小;随着竖向应力增大,土体排水越困难,脱湿速率降低,残余体积含水率随之增大,其持水性能逐渐增强。In order to study the water-holding characteristics of unsaturated red sandstone soil under wet-dry cycles and vertical stress,the soil-water characteristic curve(SWCC)of unsaturated red sandstone soil under different number of wet-dry cycles and different vertical stress was determined by pressure plate instrument,and the change rule of the characteristic values such as air intake value and residual water content of the unsaturated red sandstone soil was analyzed.water characteristic curve.The results show that:wet-dry cycles and vertical stress have great impact on the soil-water characteristics of unsaturated red sandstone soil;with the increase of the number of wet-dry cycles,the air intake value gradually decreases,the saturated volume water content decreases,and the water-holding capacity gradually decreases;with the increase of vertical stress,the drainage of the soil body becomes more difficult,the dehumidification rate decreases,the residual volume water content increases,and the water-holding capacity gradually increases.

关 键 词：非饱和红砂岩土 干湿循环 竖向应力 土水特性 

分 类 号：TU411[建筑科学—岩土工程]