国内外比重计法颗粒分析试验相关性研究

Experimental Study of Correlation of Particle Size Distribution by Hydrometer Method at Home and Abroad

为了解国内颗粒分析方法与国际上通用的方法之间的相关性,分别根据国际通用规范ASTM（D422）和我国的《土工试验方法标准》（GB/T50123-1999）对多种天然土样和纯粘土矿物开展颗粒分析试验,探讨两者之间的异同.试验结果表明：ASTM法获得的粒径分布曲线位于GB/T法上方,两者之间的差异主要发生在粒径为0.005~0.075mm间,并且差异随粒径的减小而增大,随土样的液限的增加而增加.此外,ASTM法与GB/T法对蒙脱土的影响较大,对高岭土的影响较小.最后,分别建立了采用ASTM法与GB/T法获得的粒径小于0.005mm颗粒含量和粒径小于0.002mm颗粒含量相互间转化的方法.

In order to identify the difference between particle analysis results achieved by according the International rule ASTM（D422）and Standard for Soil Test Method in China（GB/T50123-1999）,this paper analyzes multiple natural soil sample and pure clay mineral particle by above two standards respectively.According to the analysis,the particle distribution curve for ASTM lies above the one according GB/T.In the curve,when particle diameter is from 0.005 to 0.075 millimeter,the difference between two curves is more significant.And the difference keeps growing while diameter getting smaller and this trend also can occur with liquid limit increasing.In addition,the analysis for montmorillonite will be quite different when using these two standards but not for the kaolin sample.At last,the conversion method about particles content finer than 0.005 mm and 0.002 mm obtained by ASTM method and GB/T method are established respectively.