用激光粒度仪进行粘土的颗粒分析.pdf

兔. wuetutt,com
第33卷第6期
土木建筑与环境工程
Vol 33 No 6
2011年12月
ournal of Civil, Architectural & Environmental Engineering
Dec.2011
用激光粒度仪进行粘土的颗粒分析
谭晓慧,沈梦芬,张强',李丹“
合肥エ业大学a.资源与环境工程学院;b.分析测试中心,合肥230009)
摘要:为获得细粒土的粒度分布,分别采用 Mastersizer2000激光衍射粒度仪和传统的密度计法
测量合肥地区的粘土。根据激光法的测量原理和影响因素,用单因素试验法依次改变仪器的折射
率、质量浓度、超声波端位移和时间、泵速,研究这些控制参数对颗粒粒径的影响,并确定了该仪器
测量合肥地区粘土的最佳参数。通过比较最佳参数条件下的激光法和传统密度计法的测量結果,
发现激光法在粘土颗粒分析中具有测量范国更广、准确度更高、重复性更好等特点。
关键词:粘土;粒径分析;激光粒度仪
中图分类号:TU411.2文献标志码:A文章编号:1674-4764(2011)06-0096-05
Particle Size Analysis of Clay by Malvern Laser Particle Analyzer
TAN Xiao-hui, SHEN Meng-fen ZHANG Qiang, L Dan
(a School of Resources and Environmental Enginccring
b Center for Analysis and Measurement, Hefei University of Technology, Hlefei 230009, P. R. China)
Abstract: In order to study the particle size distribution of fine grained soil, the Malvern Mastersizer 2000
laser diffraction grain size analyzer and traditional densimeter method were used to test the clay in Hefei
According to the work principle and affecting factors of laser method, the parameters, such as the
refractive index, concentration, ultrasonic displacement and time, pumping speed of the apparatus, were
altered in turn. Then the influence of these control parameters on the particle size was investigated, and the
best parameters for the clay in Hefei were identified. The grain size distributions measured by laser method
under the best condition and traditional densimeter method were compared, which shows that laser method
has a wider measuring range, higher accuracy and better repetitiveness in measuring the particle size
distribution of fine grained soil.
Key words: clay; particle size analysis; laser diffraction grain size analyzer
土的粒径分布是土的基本属性,它对土的物理、因素影响大、重复性较差。文献[2]采用磁性流体作
力学及化学性质起着重要的控制作用2。此外,土为溶液,对传统的分析法作了改进,但试验过程仍存
的粒径分布曲线还可以用来预测非饱和土的水土特在很多人为因素。文献[1,6-8]研究了激光粒度仪
征曲线,这对于研究非饱和土的力学性质具有重在化工、材料、地质等领域的应用,可以看出激光粒
要意义。
度仪具有准确、高效、重复性好、人为因素影响小的
传统的土颗粒分析方法主要有筛分法及密度计特点。文献[9]研究了激光粒度仪在软土颗粒分析中
。筛分法适用于粒径大于0.075mm的粗粒土,的应用,但关手仪器精度的影响因素方面分析不足
其试验结粜较为准确。密度计法适用于粒径小于用激光粒度仪进行细粒土的颗粒分析(以下简称“激
0.075mm的细粒土,该法试验过程较为复杂,人为光法”),具有很多优点,但由于仪器设置参数较多,加
收稿日期:2011-04-28
基金项目:国家自然科学基金资助项目(40972194);合肥工业大学地质学博土后流动站资助项目(035030)
作者简介:谭晓慧(1971-),女,教授,硕士生导师、主要从事岩土力学可靠度研究,(E-mail)tantan96660126.com。