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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。
Taking expansive soil in Hefei as the research object, the relationship between gravity water content and matrix suction under different initial dry densities was measured by dialysis method and filter paper method. The porosity ratio and gravity water content relationship. Based on the theoretical analysis, the relationship between volumetric water content and matrix suction considering the volume expansion under different initial dry densities was obtained. The results show that the gravity-water-substrate-substrate suction curves corresponding to different initial dry densities roughly coincide in the middle of the curve; the volumetric water-substrate-substrate suction curves corresponding to different initial dry densities differ from the gravity-water- When the sample is nearly saturated, the volumetric water content-matrix suction curve corresponding to each initial dry density crosses.