摘要
通过重复性试验和平行性试验,开展了激光粒度分析仪在土工颗粒分析试验中的应用研究,并采用传统法与激光粒度仪法分别对88组渤海及上海的第四系海相、陆相交互沉积地层土样,进行了颗粒分析试验。针对激光粒度分析仪法提出了数据截取原则,确定了粒径适用范围。试验结果表明:(1)两种方法得到的每组级配占百分比的差值绝对值的平均值均小于8%。其中全样本中差值绝对值的平均值最大的为5.88%,粒组为0.075~0.005 mm:平均值中最小的为0.19%,粒组为0.50~0.25 mm。(2)两种方法得到的结果偏差在可接受的范围内,激光粒度仪法重复性好、测量范围广、准确度高。可以使用激光粒度仪法替代传统法来进行土工颗粒分析试验。(3)激光粒度分析仪法测试的粒径范围由激光粒度仪的型号和试验方法决定,Winner2009激光粒度分析仪可测量的范围:湿法为0.000 01~2 mm、干法为0.001~2 mm,而传统法在理论上没有最小测量粒径。
In this paper,the application of laser particle size analyzer in the geotechnical grain size distribution analysis was evaluated by the repeatability tests and parallel comparative tests.The grain size distribution tests of 88 sets of quaternary marine and continental interactive sedimentary soil samples from Bohai region and Shanghai region were performed by using the traditional method and the laser particle size analyzer methods,respectively.The principle of the data interception is proposed,and the applicable range of grain size is determined in the application of laser particle size analyzer.The test results show that:1.The average absolute value of the percentage difference of each group obtained by the two methods is less than 8%.the average absolute value of the maximum grade in the entire samples was 5.88%,which was 0.075~0.005 mm;The lowest average value was 0.19%,which was 0.50~0.25 mm grading group.2.The comparative study shows that the deviation of the results obtained by the two methods is within the acceptable range.The laser particle sizer method has good repeatability,wide grain size measurement range and high accuracy.The laser particle sizer method can be used replacing the traditional method in the geotechnical grain size distribution analysis.3.The grain size distribution test of laser particle size analyzer determined by the laser particle size analyzer model and test method.Winner 2009 laser particle size analyzer could be measured range:in wet method,it was 0.00001~2 mm,in dry method,it was 0.00001~2 mm,and the traditional method in theory has no minimum measured particle size.
作者
马杰
MA Jie(China Railway Design Co.Ltd.,Tianjin 300251)
出处
《土工基础》
2022年第3期466-470,496,共6页
Soil Engineering and Foundation
基金
中国铁路设计集团有限公司科研课题(2019YY320107)。
关键词
颗粒分析
激光粒度分析仪
传统法
对比分析
particle size distribution analysis
laser particle size analyzer
traditional method
comparative analysis
