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土-水特征曲线是描述非饱和土水力特性的重要参数之一。利用非饱和土固结仪对2组5个压实非饱和黄土试样进行土-水特征试验,研究了不同的竖向应力和干湿循环对压实非饱和黄土土-水特征曲线的影响。试验表明,随着竖向应力的增大,压实黄土的进气值和脱湿率逐渐增大;在一个干湿循环中,同一基质吸力下脱湿曲线所对应的含水率大于增湿曲线所对应的含水率,脱湿率大于增湿率;第2次干湿循环所产生的滞回圈大小小于第1次干湿循环;滞回圈大小随竖向应力的变化而变化。
Soil-water characteristic curve is one of the important parameters to describe the hydraulic characteristics of unsaturated soil. The soil-water characteristics of two groups of five compacted unsaturated loess samples were tested with unsaturated soil consolidation instrument. The effects of different vertical stress and wet-dry cycles on the soil-water characteristic curve of compacted unsaturated loess . The results show that with the increase of vertical stress, the infiltration value and desiccation rate of compacted loess gradually increase. In a wet-dry cycle, the moisture content corresponding to the desorption curve under the same substrate suction is greater than the humidification curve The corresponding moisture content and dehumidification rate are greater than the humidification rate. The hysteresis loop generated by the second wet-dry cycle is smaller than the first wet-dry cycle. The hysteresis loop size varies with the vertical stress.