摘要
在讨论孔压圆锥贯入试验的三种分类图之后,本文提出了一种新的分类图。由一个新参数Nh,来区分不同的软土(砂、粉土和粘土)分别位于新分类图上不同的部位。Nh可由圆锥阻力、孔隙压力及孔深加以确定。有了连续的Nh剖面,即可在现场进行土的分类。以三个荷兰实例说明新分类图是可行的,并由欧美国家24孔孔压圆锥贯入试验资料绘制了新分类图,图中各种土类分界线Nh值亦与荷兰土相同。最后,讨论了新分类图存在的某些局限性。
Three classification charts which have been proposed in the past are examined and discussed. A new chart is proposed in this paper. Different kinds of soils, such as sand, silty soils and clays, are found to be located in different parts of the chart. Based on this chart,a new parameter, Nh, is established to distinguish the different kinds of soils. This parameter is obtained from the measured cone resistance, pore pressure and depth. Classification can be easily performed in the field from the Nh profile. Three examples in Holland are used to illustrate the reliability of the new chart. The new chart is drawn from as many as 24 sets of the piezocone test data in the countries of Europe and America. Nh value of different soils in the new chart is as many as Dutch soils. Finally, the limitations of the new chart are discussed.
