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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[1] 姚海林,杨 洋,程 平,等. 膨胀土壤标准吸湿含水率及其试验方法[J]. 岩土力学,2004,5(6):856-859. doi: 10.3969/j.issn.1000-7598.2004.06.003 [2] 姚海林,杨 洋,程 平,等. 膨胀土标准吸湿含水率试验研究[J]. 岩石力学与工程学报,2004,23(17):3009-3013. doi: 10.3321/j.issn:1000-6915.2004.17.028 [3] 许锡昌,陈善雄,余 飞,等. 备样方法对标准吸湿含水率的影响[J]. 岩石力学与工程学报,2006,25(10):2135-2139. [4] 杨 明,许锡昌,罗红明,等. 皖西膨胀土标准吸湿含水率特征[J]. 深圳大学学报(理工版),2009,26(3):305-309. [5] JTG E40—2007 公路土工试验规程[S]. 北京: 人民交通出版社, 2007. [6] 龚晓南. 土力学[M]. 北京: 中国建筑工业出版社, 2007. [7] JTG D30—2015 公路路基设计规范[S]. [8] JTG C20—2011 公路工程地质勘察规范[S]. [9] GB 50112—2013 膨胀土地区建筑技术规范[S]. [10] 刘 军,王景宏,卓慧英,等. 土的标准吸湿含水率试验与时间关系分析[J]. 土工基础,2021,35(1):61-64. -
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