an engineering geological characterisation of tropical clays - GBV

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Black clays: Greek method
P% = (P/SP) * 100
120
100
80
60
40
20
n = 21
P/SP = -17,32Ln(S/P) + 1,18
R 2 = 0,85
S/P vs P/SP (%)
0
0,00 0,50 1,00 1,50 2,00 2,50 3,00
S (%)/P (kPa)
Fig. 7.38a. Correlation between ratios S(%)/P and P/SP (%), i.e. Greek method, for combined
sample results of black clays ( S% derived w.r.t initial specimen height Ho).
Black clays: Greek method
P% = (P/SP) * 100
120
100
80
60
40
20
n = 21
P/SP = -17,32Ln(S/P) + 1,18
R 2 = 0,85
S/P vs P/SP (%)
0
0,01 0,10 1,00 10,00
S (%)/ P (kPa)
Figure 7.38b. Correlation between S(%)/P on log scale and P/SP (%) for combined sample
results of black clays, based on the Greek method (S% w.r.t initial specimen height, Ho).
Correlations using the Greek method resulted in the following relationship, i.e.
P (%) = -17.32Ln(S/SP) + 1,18 (7.51)
Where S (%) = percentage swelling in relation to initial specimen height, Ho mm.
P (kPa) = load decrement
SP (kPa) = swelling pressure
P% = [P(kPa)/SP (kPa)] * 100