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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162<br />
Plasticity index variation; < 0,50m depth<br />
Plasticity index (%)<br />
60<br />
50<br />
40<br />
30<br />
20<br />
10<br />
Pr<strong>of</strong>ile A<br />
Pr<strong>of</strong>ile B<br />
Pr<strong>of</strong>ile C<br />
Pr<strong>of</strong>ile D<br />
Pr<strong>of</strong>ile E<br />
0<br />
0 2000 4000 6000 8000 10000 12000<br />
Dist<strong>an</strong>ce along pr<strong>of</strong>ile (m)<br />
Figure 8.5a. Plasticity index variation across the study area for the depth<br />
<strong>of</strong> less th<strong>an</strong> 0,50m (north-south dist<strong>an</strong>ce: 4000 m).<br />
Pr<strong>of</strong>iles A, B, C, D <strong>an</strong>d E show plasticity indices <strong>of</strong> 41-54%, 43-49%, 41-49%, 39-48% <strong>an</strong>d<br />
46-49% for depths <strong>of</strong> less th<strong>an</strong> 0,50m; <strong>an</strong>d 39-55%, 39-50%, 43-50%, 45-51% <strong>an</strong>d 47-50%<br />
for depths <strong>of</strong> 0,5m <strong>an</strong>d greater, respectively.<br />
Plasticity index variation; 0,50m <strong>an</strong>d greater<br />
60<br />
Plasticity index (%)<br />
50<br />
40<br />
30<br />
20<br />
10<br />
Pr<strong>of</strong>ile A<br />
Pr<strong>of</strong>ile B<br />
Pr<strong>of</strong>ile C<br />
Pr<strong>of</strong>ile D<br />
Pr<strong>of</strong>ile E<br />
0<br />
0 2000 4000 6000 8000 10000 12000<br />
Dist<strong>an</strong>ce along pr<strong>of</strong>ile (m)<br />
Figure 8.5b. Plasticity index variation across the study area for the depth <strong>of</strong><br />
0,50m <strong>an</strong>d greater (north-south dist<strong>an</strong>ce: 4000 m).<br />
The plasticity index <strong>of</strong> soils is similarly distributed across the study area for both depths <strong>of</strong><br />
less th<strong>an</strong> 0,50m <strong>an</strong>d those <strong>of</strong> 0,50m <strong>an</strong>d deeper, exhibiting maximum <strong>an</strong>d minimum values <strong>of</strong><br />
54% <strong>an</strong>d 39% with a r<strong>an</strong>ge <strong>of</strong> 15%; <strong>an</strong>d 55% <strong>an</strong>d 39% with a r<strong>an</strong>ge <strong>of</strong> 16%, respectively<br />
(Table 8.1). Soil depths <strong>of</strong> less th<strong>an</strong> 0,50m are also characterised by a medi<strong>an</strong>, mode <strong>an</strong>d<br />
me<strong>an</strong> value <strong>of</strong> 47%, as well as a st<strong>an</strong>dard deviation <strong>of</strong> 2,78 <strong>an</strong>d vari<strong>an</strong>ce <strong>of</strong> 7,74. Similar <strong>an</strong>d<br />
closely comparable parameters were calculated for depths <strong>of</strong> 0,50m <strong>an</strong>d greater, in terms <strong>of</strong><br />
medi<strong>an</strong>, mode <strong>an</strong>d me<strong>an</strong> values <strong>of</strong> 48%, 49% <strong>an</strong>d 48%, respectively. A st<strong>an</strong>dard deviation <strong>of</strong><br />
3,28 <strong>an</strong>d vari<strong>an</strong>ce <strong>of</strong> 10,76 were also computed for the latter depth interval. A summary <strong>of</strong><br />
the distribution in the form <strong>of</strong> contour maps for the two depth intervals is presented in Fig.