an engineering geological characterisation of tropical clays - GBV
an engineering geological characterisation of tropical clays - GBV
an engineering geological characterisation of tropical clays - GBV
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illustrated in Figures 7.6, 7.7, 7.8 <strong>an</strong>d 7.9. The index parameters were obtained by performing<br />
tests on disturbed <strong>an</strong>d/ or fractioned samples <strong>of</strong> the <strong>clays</strong>.<br />
Fig. (7.6a) shows the correlation between <strong>an</strong>gle <strong>of</strong> shear resist<strong>an</strong>ce (φ`) <strong>an</strong>d moisture content<br />
in relation to Atterberg limits, i.e. the relative consistency (Cr), to be fair <strong>an</strong>d <strong>of</strong> moderate<br />
strength (R=0,58). A general increase in the <strong>an</strong>gle <strong>of</strong> shear resist<strong>an</strong>ce with increased<br />
consistency is observed. However, a broad spread <strong>of</strong> results on the plot diagram occurs, <strong>an</strong>d<br />
serves to be indicative <strong>of</strong> the influence <strong>of</strong> other import<strong>an</strong>t factors such as soil fabric <strong>an</strong>d/ or<br />
structure <strong>an</strong>d clay mineralogy on the magnitude <strong>of</strong> shear <strong>an</strong>gles <strong>an</strong>d, therefore, the strength<br />
characteristics <strong>of</strong> the soils.<br />
Black <strong>clays</strong><br />
Angle <strong>of</strong> shear resist<strong>an</strong>ce<br />
φ´ (°)<br />
35<br />
n = 41<br />
30<br />
25<br />
20<br />
R 2 = 0,34<br />
15<br />
10<br />
1,015 1,215 1,415 1,615<br />
Relative consistency, Cr<br />
Shear <strong>an</strong>gle vs Cr<br />
Figure 7.6a. Correlation between <strong>an</strong>gle <strong>of</strong> shear resist<strong>an</strong>ce (φ´ ) <strong>an</strong>d relative<br />
consistency, Cr, <strong>of</strong> black <strong>clays</strong>.<br />
Black <strong>clays</strong><br />
Cohesion c´(kN/m²)<br />
60,00<br />
n = 41<br />
50,00<br />
40,00<br />
30,00<br />
20,00<br />
10,00<br />
0,00<br />
15 20 25 30 35<br />
Moisture content Wn (%)<br />
Cohesion vs Wn<br />
Figure 7.6b. Correlation between cohesion (c´ ) <strong>an</strong>d moisture content, Wn,<br />
<strong>of</strong> black <strong>clays</strong>.
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