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通过压力板仪测定并对比分析了不同初始干密度下粉质黏土的土水特征曲线;使用GDS非饱和土三轴仪,进行了不同初始干密度、不同基质吸力下非饱和粉质黏土的强度试验。结果表明:van Genuchten模型可以较好拟合不同初始干密度粉质黏土土水特征曲线;试样进气值与初始干密度呈正相关,持水能力和水稳定性随初始干密度的增大逐渐增大;相同初始干密度的非饱和粉质黏土强度随基质吸力的增大而增大,随着基质吸力的增大,基质吸力对试样抗剪强度的贡献值逐渐变小。不同初始干密度的试样体积变化均随着基质吸力的增大而减小,且初始干密度越大,不同基质吸力试样体变越接近一致。重塑非饱和粉质黏土的应力-应变关系可以用双曲线模型来描述,试样切线模量随基质吸力的增大而增大。
The soil-water characteristic curve of silty clay with different initial dry densities was measured and analyzed by pressure plate instrument. The strength of unsaturated silty clay with different initial dry density and different substrate suction was measured by GDS unsaturated triaxial apparatus. test. The results show that the van Genuchten model can better fit the soil water characteristics curve of different initial dry silty clay. The gas inlet value of the samples is positively correlated with the initial dry density. The water holding capacity and water stability gradually increase with initial dry density The strength of unsaturated silty clay with the same initial dry density increases with the increase of substrate suction. With the increase of substrate suction, the contribution of substrate suction to the shear strength of the sample decreases gradually. The volumetric changes of samples with different initial dry densities decrease with the increase of substrate suction, and the greater the initial dry density, the closer the sample samples of different matrices become closer together. The stress-strain relationship of remodeled unsaturated silty clay can be described by the hyperbolic model. The tangent modulus of the sample increases with the increase of substrate suction.