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压缩指数Cc是土体变形特征的一个重要指标,一般通过固结试验获得,需要耗费较长的时间以及大量人力物力,因此通过其他基本物理指标(天然含水率wn、初始孔隙比e0、液限wL)来推算压缩指数Cc是一个快捷有效的方法。从上海地区钻孔得到第2~6层土的原状土样进行固结试验,并结合多个地点的勘察报告数据,发现wn和e0具有较高的线性相关性,但wn与wL间的相关性不明显。考虑到wn相比e0更容易得到,选用wn来建立与Cc的关系式。研究认为,常用的线性关系不适用于上海黏土中含水率wn大于45%的情况,提出了指数函数式(8)。该函数还可适用于中国东部沿海其他地区的黏土。
Compressive index Cc is an important indicator of soil deformation characteristics, usually obtained through the consolidation test, takes a long time and a lot of manpower and resources, so through the other basic physical indicators (natural water content wn, initial porosity ratio e0, liquid limit wL) to calculate the compression index Cc is a quick and effective method. Consolidation experiments were carried out on the undisturbed soil samples of the second to sixth soil layers from the borehole in Shanghai. Based on the survey data from multiple locations, it was found that wn and e0 had high linear correlations, but the correlation between wn and wL Sex is not obvious. Considering that wn is easier to obtain than e0, we choose wn to establish the relation with Cc. The study suggests that the commonly used linear relationship is not suitable for the case where the water content wn in Shanghai clay is more than 45%, and the exponential formula (8) is proposed. This function can also be applied to clay in other parts of China’s eastern coast.