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加湿条件下膨胀土土水特征曲线的试验研究 被引量:1

EXPERIMENTAL STUDY OF SOIL-WATER CHARACTERISTICS CURVES OF EXPANSIVE SOIL UNDER WETTING CONDITION
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摘要 以合肥市膨胀土为研究对象,利用渗析法和滤纸法试验测得土体不同初始干密度下重力含水率与基质吸力的关系;利用加湿试验测得土样加湿时孔隙比与重力含水率的关系。基于理论分析,求得土体在不同初始干密度下考虑体积膨胀的体积含水率与基质吸力的关系。结果表明:不同初始干密度对应的重力含水率-基质吸力曲线在曲线中部大致重合;不同初始干密度对应的体积含水率-基质吸力曲线与重力含水率-基质吸力曲线的形状有所区别;土样接近饱和时,各初始干密度对应的体积含水率-基质吸力曲线出现交叉。 The expansive soil in Hefei was studied.Osmotic method and filter paper method were used to measure the relationship between gravity water content and matrix suction in different initial dry densities.The relationship between void ratio and gravity water content of the soil was measured by wetting test.Then, according to the theoretical analysis, the soil-water characteristic curve ( SWCC) considering the volume change of different initial dry densities was obtained.The results showed that the initial dry density had an influence on the SWCC merely to the water content of the soil samples near their saturation water content, and they were roughly coincident in middle matrix suction parts.Different initial dry densities had obvious influence on SWCC considering the volume change of wetting.When the soil moisture content closed to saturation, a cross in curves of volumetric water content and matrix suction in different initial dry densities appeared.
出处 《工业建筑》 CSCD 北大核心 2015年第5期76-80,共5页 Industrial Construction
基金 国家自然科学基金项目(40972194 41272251)
关键词 土水特征曲线 膨胀土 渗析法 滤纸法 初始干密度 加湿试验 SWCC expansive soil osmotic method filter paper method initial dry density wetting test
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