密实度及有荷干湿循环对土-水特征曲线的影响  

Influence of Compaction and Drying-wetting Cycle with Loading on Soil-Water Characteristic Curve

作　　者：杨迎[1] 陈勇[1] 李平[1] 唐杰鑫 

机构地区：[1]三峡大学三峡库区地质灾害教育部重点实验室,湖北宜昌443002

出　　处：《水电能源科学》2016年第3期128-131,共4页Water Resources and Power

基　　金：湖北省自然科学基金项目(2014CFB267);国家自然科学基金青年基金项目(51409149)

摘　　要：鉴于土-水特征曲线在非饱和土的研究中具有重要意义,采用Tempe压力膜仪和多功能土-水特征曲线试验仪,研究了密实度及固结压力下干湿循环对非饱和重塑粘土的土-水特征曲线的影响,并利用Van Genuchten模型对试验结果进行曲线拟合。结果表明,土体密实度越大,所受固结压力越大,则土体的进气值越大,失水速率越小,残余含水率越大;在固结压力下的干湿循环过程中,脱湿曲线失水速率越小,进气值越大,随干湿循环次数的增多,因土体孔隙发生改变,脱湿曲线的进气值呈增大趋势,且回滞环逐渐减小。Soil-water characteristic curve plays an important role in unsaturated soil research.Tempe instrument and multifunctional soil-water characteristic curve test instrument are used to study the influences of compaction and dryingwetting cycle on SWCC of unsaturated remolded clay.The Van Genuchten model is employed to fit SWCC.It is found that the greater the compactness of consolidation and the higher of consolidation pressure are,the higher air entry value,the smaller loss rate and the greater the residual moisture content are.The smaller loss rate of water in drying curve is,the higher air entry value is in the test of drying-wetting cycles under consolidation pressure.Besides,the air entry value of drying curve gradually increases and the hysteresis loop decreases due to the change of soil pore,with the increasing number of drying-wetting cycle.

关 键 词：土-水特征曲线 密实度 干湿循环 VAN GENUCHTEN模型 

分 类 号：TU41[建筑科学—岩土工程]