4种激光粒度仪对下蜀土湿法粒度测试的对比研究

Contrasts of Grain Size by Four Laser Particle Size Analyzers Based on Wet Test

使用4种应用较为广泛的激光粒度仪(Mastersizer2000、Bettersize2000、Horiba LA950和LS13320)对粒度差异较小的下蜀土(土塘剖面)进行了测试,从而对比分析不同激光粒度仪对于下蜀土的粒度组成测试差异及其这种差异对研究结果可能产生的影响.结果表明:对粉砂颗粒组分的分析,4种激光粒度分析仪分析结果的差异最小,而对砂和粘土颗粒组分分析的差异最大.就粒度频数曲线、概率累积曲线、粒度组分、C-M图、粒度参数散点图及粒度参数剖面垂向变化等统计参数与统计方式而言,4种仪器的测试结果均有一定的差异,其中,概率累积曲线、粒度参数散点图差异较大.粒度参数的剖面变化差异也较大,影响了对剖面的阶段性划分,这在一定程度上影响了研究结果,造成使用不同仪器,可能会得出不同的结果.

The Xiashu loess deposits from Tutang section with the character of less grain size change in northern part of Jiangxi Province, was measured by four laser particle size analyzers, i. e., Mastersizer-2000, Bettersize-2000,Horiba LA-950 and LS-13320,to identify the differences among the grain size of Xiashu loess and their impact on the research results and conclusions. The testing results indicated that the difference among silt fraction measured by the four instruments is minimal,but the differences among sand and clay measures are maximal,which suggests that the laser analysis of grain size is most suitable for the determination of silt particle size range. Based on some statistical parameters and methods,for example,grain-size frequency curves,probability cumulative curves,grain-size components,C-M diagram,scatter plots of grain-size parameters and vertical change of grain-size parameters on profile,the measured resultsfrom the four instruments showed some differences in all aspects. The differences among probability cumulative curves,scatter plots of grain-size parameters and thus the vertical change of grain-size parameters on profile are large,which might after the judgment of the researcher and result in different research results.