Above 'Ye "'" 0.005%, the average curves are in a relatively
good agreement with the curves from Fig. 2, showing a general
trend of A decreasing with PI. However, for all three clays,
there is a noticeable variation of A at any given 'Ye' apparently
due to the wide ranges of (J'~e and OCR applied. For Clay A,
this variation is the largest; for Clay B, it is considerably
smaller; and for Clay C, it is almost negligible. This suggests
that the effects of (J'~e and OCR on A become smaller as the
PI of the soil increases. The fact that the variation of Aat any
'Ye applied in this study is greater for sands having PI =0
(exhibited in Figs. 8-11) than for Clay A, having a low PI
[exhibited in Fig. l2(a)), supports this observation further.