筛法/激光粒度仪法接序测定全样泥沙级配的调整处理

The Correction Method of Grain Size of Total Load for the Phenomena of Results of Two Series of Grain Size Analysis Intercrossed during the Analysis with both Sieve Method and Laser Grain Size Analyzer

筛法／激光粒度仪法接序测定全样泥沙粒度是泥沙粒度分析的基本方法,分级交混现象会时有出现,需要研究全样级配的调整处理。本文从先用筛分法分析全样泥沙到分界粒级,再将分界粒级以下(筛下)泥沙做全样用激光粒度分析仪法分析的作业程序,按激光粒度分析仪法小于分界粒级D_(FJ)的泥沙的质量／体积比例等于1(100％)和小于1(100％)两种可能,提出了相应的粒度分析级配序列计算调整方法和全样级配序列的接序方法。分析了以“筛法分界粒级级配为准”和“以激光粒度分析仪法最大粒级级配为准”的不足。认为激光粒度分析仪法向上粒级的分界交混质量较小,应用本文“激光粒度分析仪法分析小于分界粒级D_(FJ)的泥沙的质量／体积比例小于1(100％)”的方法和公式,调整处理分级交混问题比较合理。

The combination of sieve method and laser grain size analysis to analyze grain size of total load is the fundamental method for grain size analysis. The phenomenon of results of two series of grain size analysis intercossed always occurs. It is necessary to research the correction of grain size of total load. This paper puts forward the correction method of grain size and the integrating methods of two series of grain size analysis, supposes that firstly adopting sieve method to analyze sediment, and then analyzing the finer sediment （the part with grain size smaller than the dividing line, namely, smaller than the size of adopted sieve） with laser grain size analyzer, two chances are possible that the ratio of mass to volume, of the part with grain size smaller than the dividing line, analyzed with laser grain size analyzer, is equal to 1 （100%） or smaller than 1 （100%）. The paper also analyzes the disadvantage of two correction methods, of which the first is adopting the dividing size of sieve method as basis and the second is adopting the maximum grain size analyzed with laser grain size analyzer as basis. Finally, the paper draws the conclusion that the part actually exceeding the scope of laser grain size analyzer is smaller in mass and it is reasonable to adopt the method put forward in the paper to correct the grain size and getting rid of the contradiction of results of two series of grain size analysis intercrossed.