an engineering geological characterisation of tropical clays - GBV

170
1°19´S 4000
Profile distance (m) Profile distance (m)
3000
2000
West
1000
1°21.5´S
1°19´S 4000
3000
2000
West
1000
% clay variation (< 0,5 m)
0
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
36°49´E
South Profile distance (m)
36°55´E
% clay variation (> 0,5 m)
%clay
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
1°21.5´S
0
0 1000 2000 3000 4000 5000 6000 7000 8000 9000 10000
36°49´E
South
Profile distance (m) 36°55´E
38
36
34
32
30
28
26
24
22
20
18
16
14
Figure 8.11. Contour maps showing distribution and variation of %clay in black clays.
40
% clay
The variation of percentage fines is also identical at the two depth intervals, in terms of
maximum and minimum values of 96% and 74% (range: 22%); and 93% and 72% (range:
21%), respectively; as well as median, mode and mean values of about 90%. Standard
deviations registered for the data sets at the two depth intervals are also of the same order of
magnitude, i.e. 3,81 and 4,50, respectively. The variation along field profiles at the two depth
intervals is also illustrated in Figure (8.12) and a contoured representation in Fig.(8.13).