根据天然荷重对粘土压密作用的有效性,本文把欠压密土区分为两类,即一般欠压密土和有结构强度的欠压密土。分析了欠压密土形成的地质条件。讨论了颗粒间固化联结键的成因。这类土,由于固化联结键和高孔隙度,其压密特性,孔隙压力的变化和剪切应力—应变关系均与应力水平有密切关系。 According to the effectiveness of the natural load on compaction of clay, this paper divides the undercompact soil into two types, ie, underpressure dense soil and underpressure compact soil with structural strength. The geological conditions for the formation of under-compacted soil were analyzed. The cause of the solidification bond between particles was discussed. This kind of soil, due to the solidification bond and high porosity, its compaction characteristics, pore pressure changes and shear stress-strain relations are closely related to the stress level.