Analysis of Relationship Between Standard Moisture Absorption and Soil Particle Composition
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摘要: 土的标准吸湿含水率是判定土的膨胀性的重要依据之一。通过分析土的标准吸湿含水率与土的颗粒组成的关系，确立了土的标准吸湿含水率与黏粒含量（黏土矿物含量）呈良好的线性函数关系，为以黏粒含量为依据对标准吸湿含水率进行辅助判定奠定了基础，得出了标准吸湿含水率在数值上约为黏粒含量数值的1/10。同时，对土的不同颗粒粒径所对应的矿物成分进行分析，提供了用黏粒含量判定标准吸湿含水率的理论基础。通过与自由膨胀率、塑性指数对比，分析了用标准吸湿含水率来判定土膨胀性和用颗粒组成辅助判定标准吸湿含水率的的优越性。Abstract: The standard moisture absorption of soil is one of the important basis to judge the expansibility of soil. The relationship between the standard moisture absorption of soil and the composition of different particle sizes of soil were analyzed, and a certain linear function relationship between the standard moisture absorption of soil and the clay content (clay mineral content) was concluded. The foundation is established for the auxiliary judgment of the standard moisture content, and it is concluded that the standard moisture content is about 1/10 of the clay content numerically. At the same time, the mineral composition corresponding to different particle sizes of soil is analyzed, which provides the theoretical basis for determining the standard moisture content by clay content. By comparing with free expansion rate and plasticity index, the advantages of standard moisture content to judge soil expansion and particle composition to judge standard moisture content are analyzed.
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Key words:
- standard moisture absorption /
- clay content /
- swelling /
- particle composition
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表 1 膨胀土分级标准
分级指标 级别 非膨胀土 弱膨胀土 中等膨胀土 强膨胀土 自由膨胀率δef/ % δef<40 40≤δef<60 60≤δef<90 δef≥90 塑性指数Ip Ip<15 15≤Ip<28 28≤Ip<40 Ip≥40 标准吸湿含水率wa/ % wa<2.5 2.5≤w a<4.8 4.8≤wa<6.8 wa≥6.8 
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