an engineering geological characterisation of tropical clays - GBV

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fraction at the two depth intervals across the study area. The distribution and variation of
percent clay in black clays across the study area is also summarised in contour form in Fig.
(8.11).
Table 8.2. Values of clay and fines fractions of soils along field profiles in this study.
Profile Depth (m) Sample No. Sta. position (m) PI (%) % clay % fines Depth (m) Sample No. PI (%) % clay % fines
SA1-30cm 0 41 18 90 SA1-50cm 39 16 72
A < 0,50 SA2-30cm 250 54 26 90 ≥ 0,50 SA2-70/105cm 55 25 87
SA28-30cm 6750 45 23 94 SA28-50cm 47 18 88
SA37-30cm 9000 43 32 89 SA37-50/80cm 39 33 91
SA41-30cm 10000 47 37 96 SA41-50cm 49 44 89
SB1-30cm 0 47 30 90 SB1-50/70cm 50 26 91
B < 0,50 SB5-30cm 1000 47 29 89 ≥ 0,50 SB5-50/70cm 50 26 91
SB7-30cm 1500 48 31 89 SB7-50/70cm 49 27 91
SB18-30cm 4250 43 13 84 SB18-50cm 39 14 88
SB27-30cm 6500 47 32 94 SB27-50cm 49 33 92
SB31-30cm 7500 49 35 90 SB31-50cm 48 30 93
SB41-30cm 10000 44 20 88 SB41-50cm 47 22 86
SB42-30cm 10250 44 23 88 SB42-50cm 47 21 86
SC1-30cm 0 48 30 87 SC1-50cm 48 27 90
C < 0,50 SC5-30cm 1000 48 31 88 ≥ 0,50 SC5-50cm 47 27 91
SC9-30cm 2000 48 31 89 SC9-50cm 48 27 89
SC17-30cm 4000 41 29 88 SC17-50cm 48 27 86
SC25-30cm 6000 49 23 94 SC25-50cm 48 18 89
SC29-30cm 7000 49 28 91 SC29-50cm 43 26 92
SC33-30cm 8000 49 27 91 SC33-50cm 50 28 91
SC41-30cm 10000 47 16 74 SC41-50cm 47 19 85
SD1-30cm 0 46 32 91 SD1-50/80cm 48 27 90
D < 0,50 SD5-30cm 1000 47 31 91 ≥ 0,50 SD5-50/70cm 49 27 90
SD7-30cm 1500 48 32 90 SD7-50/70cm 51 26 90
SD17-30cm 4000 44 13 84 SD17-50cm 49 21 84
SD25-30cm 6000 39 24 84 SD25-50cm 45 14 74
SD29-30cm 7000 47 27 90 SD29-50cm 51 28 92
SD33-30cm 8000 47 29 90 SD33-50cm 50 28 91
SD41-30cm 10000 46 35 92 SD41-50cm 49 41 89
SE1-30cm 0 48 31 89 SE1-50/70cm 50 27 91
E < 0,50 SE5-30cm 1000 48 31 89 ≥ 0,50 SE5-50/70cm 49 27 91
SE13-30cm 3000 47 33 93 SE13-50cm 49 34 92
SE21-30cm 5000 49 24 94 SE21-50cm 49 20 88
SE29-30cm 7000 46 27 92 SE29-50cm 47 29 92
SE37-30cm 9000 48 33 90 SE37-50cm 48 31 92
SE41-30cm 10000 47 19 89 SE41-50cm 48 19 85
max 54 37 96 max 55 44 93
Statistical < 0,50 min 39 13 74 ≥ 0,50 min 39 14 72
analysis range 15 24 22 range 16 30 21
median 47 29 90 median 48 27 90
mode 47 31 90 mode 49 27 91
mean 47 27 89 mean 48 26 89
std 2,78 6,09 3,81 std 3,28 6,54 4,50
var 7,74 37,04 14,48 var 10,76 42,82 20,25
cov 31,86 5,92 cov 31,86 5,92
correlation 0,82 0,36 correlation 0,82 0,36