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中文摘要：
针对非饱和重塑黏土，结合收缩曲线和土水特征曲线探讨试样在干燥收缩过程中基质吸力与孔隙比之间的关系，研究结果表明，当基质吸力增大到某一特定吸力时，基质吸力的增大对试样收缩变形并无显著影响，称此基质吸力为缩限吸力Ss。屈服吸力So和缩限吸力Ss将试样收缩过程分为3个阶段：弹性阶段、弹塑性阶段和缩限阶段；为探讨试样的土水特征曲线和收缩系数对净平均应力的相关性，采用GDS非饱和土三轴仪在控制试样净平均应力条件下进行干湿循环试验。试验结果表明，试样收缩系数和土水特征曲线密切地依赖于净平均应力；试样在吸湿过程中，在低净平均应力下试样发生膨胀，而在较高净平均应力下试样在膨胀后发生坍塌。
英文摘要：
The empirical relationship between matric suction and void ratio on drying path for remoulded clay is established by utilizing the shrinkage curves and the soil-water characteristic curves which are determined through experimental tests. The result shows that increase of suction can＇t cause shrinkage of soil sample when matric suction reached a specific value which is defined as the shrinkage limit suction ss. The process of shrinkage of soil is divided by yielding suction so and shrinkage limit suction ss into three stages, i.e. elastic stage, elastoplastic stage and stage of shrinkage limit. In order to study the soil water characteristic curve and shrinkage coefficient under different net mean stresses, using GDS unsaturated triaxial apparatus, the total volume change and water content change are examined under controlled net mean stress in a predetermined stress path. The results show that shrinkage index and the soil-water characteristic curve are dependent on net mean stress. In addition, in wetting stage, i.e. zero suction is applied to soil samples in saturated state, the swelling takes place under lower net mean stress. Under higher net mean stress, however, swelling in the beginning is followed by a certain volumetric contraction.
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