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本文根据甘肃１７个剖面湿陷系数的测定，查明黄土湿陷性从上向下呈现波动变小，造成湿陷性垂向上变小的原因是土层自重压力，引起波动变化的原因是土层受成壤强弱的差异。作者根据镜下鉴定和湿陷性与成壤强弱关系的研究，将黄土微结构分为１８种类型，指出湿陷性是在几种特定的成壤过程中产生的，是成壤作用弱的黄土所具有的特征，受风化成壤作用强的黄土不具湿陷性
According to the determination of the collapsible coefficient of 17 profiles in Gansu, the reason why the collapsibility of the loess is smaller and the collapsibility of the loess is smaller is caused by the self-weight of the soil and the reason of fluctuating is that soil Layer by soil strength difference. According to the microscopic identification and the relationship between the collapsibility and pedogenic strength, the authors classify the microstructure of the loess into 18 types, pointing out that the collapsibility is produced in several specific soil-forming processes and is weak in pedogenesis Of the loess has the characteristics of loess by weathered soil is not strong collapsible