摘要
对广西宁明两种膨胀土的原状样和重塑样进行了饱和渗透试验、土水特征曲线试验和收缩试验.根据收缩试验结果对土水特征曲线进行了体积含水量的换算,用VG数学模型对换算后的土水特征曲线进行拟合后通过理论公式预测出非饱和渗透系数,进而得到了非饱和膨胀土的含水量-渗透系数关系及其变化规律.同时,还分析了矿物成分和结构特征对饱和-非饱和膨胀土渗透特性的影响.
Saturated permeability tests, soil-water characteristic curve （SWCC） tests and shrinkage tests are conducted on undisturbed and remolded Ningming expansive soils, and permeability coefficients of unsaturated expansive soils are calculated by modified and fitted SWCC in light of the data of shrinkage tests and VG model. According to the testing results, the relationship law between water content and permeability coefficient of unsaturated expansive soils are obtained, meanwhile, the influence of mineral content and structure characteristics of expansive soils on saturated-unsaturated permeability is also analyzed.
出处
《长沙交通学院学报》
2007年第3期26-33,共8页
Journal of Changsha Communications University
基金
交通部西部交通建设科研资助项目(200231800015)
关键词
非饱和膨胀土
渗透特性
土水特征曲线
试验研究
拟合
unsaturated expansive soils
permeability characteristics
soil-water characteristic curve
testing study
fitting
