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当土体总应力状态保持不变时,基质吸力的提高是导致孔隙水排水、土样体积收缩、孔隙结构改变的根本原因,通过吸力可以将土壤收缩曲线和土水特征曲线联系起来进行比对研究。采用广义有效应力原理分析超固结土样和正常土样的失水过程,结果表明:超固结土样中存在着相应的先期固结压力的吸力值,称之为先期固结吸力ψc。当土样吸力小于ψc时,超固结土样和正常固结土样的收缩曲线、土水特征曲线不同:超固结土孔隙比随吸力提高而减小的坡度较缓,约等于土样的回弹再压缩指数,土样处于结构性收缩阶段;先期固结压力越大,土水特征曲线的进气值越高。当土样吸力高于ψc时,超固结土样和正常固结土样的收缩曲线、土水特征曲线重合。
When the total soil stress state remains unchanged, the increase of matrix suction is the fundamental reason for pore water drainage, soil volume shrinkage and pore structure change. By comparing the soil shrinkage curve and soil water characteristic curve by suction, the study. The generalized effective stress principle is used to analyze the water loss process of overconsolidated soil samples and normal soil samples. The results show that there is a corresponding pre-consolidation pressure suction value in overconsolidated soil samples, which is called preconsolidation suction ψc. When the soil sample suction is less than ψc, the shrinkage curve and soil water characteristic curve of overconsolidated soil and normal consolidated soil are different: the slope of over-consolidation soil porosity decreases slowly with the increase of suction, which is approximately equal to soil sample Of the springback recompression index, soil samples in the structural contraction stage; the higher consolidation pressure, soil water characteristic curve of the intake value is higher. When the soil sample suction is higher than ψc, the shrinkage curve and soil water characteristic curve of overconsolidated soil and normal consolidated soil coincide.