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土是固体(土颗粒)、液体(水)、气体(空气)三相体以混合分布型式组成的复杂分散体系。土中三相体组成的比例指标,是土的最基本的物理性质指标,它们反映着土的物理状态和性质,如干燥与潮湿、疏松或紧密等。三相组成的比例指标,主要有比重、容重、孔隙率、孔隙比、含水量、饱和度、液限、塑限、塑性指数等。此外,土的矿物成分、有机质含量及粒度,对上述指标
Soil is a complex dispersed system composed of solid (earth particles), liquid (water), and gas (air) three-phase bodies in a mixed distribution pattern. The proportional index of the three-phase body composition in the soil is the most basic physical property index of the soil, and they reflect the physical state and nature of the soil, such as dry and wet, loose or tight. The proportion of three-phase composition indicators, mainly include specific gravity, bulk density, porosity, porosity ratio, water content, saturation, liquid limit, plastic limit, plasticity index. In addition, the mineral composition, organic matter content and grain size of the soil are