DETERMINATION OF PLASTIC LIMIT OF SOIL USING MODIFIED METHODS
DETERMINATION OF PLASTIC LIMIT OF SOIL USING MODIFIED METHODS
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使用改进的方法测定土壤的塑性极限
DOI：
10.11113/mjce.v20n2.222
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
A. Katimon
中科院分区：
文献类型：
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作者：
A. Safuan;A. S. Rashid;K. Kassim;A. Katimon
塑性极限是细粒土的一个重要性质。测定塑料极限的标准滚丝法因要求操作者作出相当大的判断而长期受到批评。本研究旨在寻找一种新的塑料极限测定方法，以克服标准滚丝法测定结果不一致的问题。测试了四种不同的方法。第一种方法是改进的落锥法，这是一种通常用于获得液限的方法。第二种方法是Bobrowski和Griekspoor（1992）先前提出的滚动装置法。第三种方法是由Wood和Wroth（1978）提出的，使用更重的锥体。第四种方法是冯陶伟（2004）提出的利用小型土壤容器的方法。测试了8个表征塑性指数（PI）在15% ~ 42%之间的土样。结果表明，标准方法与建议方法的相关系数在0.72 ~ 0.99之间。从回归分析结果来看，第一种方法与标准螺纹法更具可比性。
Plastic limit is an important property of fine-grained soils. The standard thread-rolling method for determining the plastic limit has long been criticized for requiring considerable judgments from the operator. This study was conducted to seek for a new method on the determination of the plastic limit in a way to overcome the inconsistence result produce by using the standard thread-rolling method. Four different methods were tested. The first method was the modified fall cone method, a method commonly used to obtain a liquid limit. The second method was the rolling device method which is previously proposed by Bobrowski and Griekspoor (1992). The third method was proposed by Wood and Wroth (1978) using a heavier cone. The fourth method was the one proposed by Tao-Wei Feng (2004) which made use of a small soil container. Eight soil samples representing plasticity index (PI) ranging from 15 to 42% were tested. The results indicated that the correlation factor between the standard methods and the suggested methods were in the range 0.72 and 0.99. Regarding to the regression analysis result, the first method is more comparable to the standard thread method.