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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128<br />
Consolidation curves <strong>of</strong> e/log p<br />
Voids ratio (e)<br />
1,501<br />
1,401<br />
1,301<br />
1,201<br />
1,101<br />
1,001<br />
0,901<br />
0,801<br />
0,701<br />
0,601<br />
0,501<br />
0,401<br />
0,301<br />
0,201<br />
0,101<br />
0,001<br />
10 100 1000 10000<br />
Pressure on log scale (log P (kPa))<br />
RD1-30cm: red soils RD1-100cm: red soils RD1-400cm: red soils<br />
SA2-70cm: black <strong>clays</strong> SA37-50cm: black <strong>clays</strong> SB1-70cm: black <strong>clays</strong><br />
SB42-50cm: black <strong>clays</strong> SC17-50cm: black <strong>clays</strong> SC29-50cm: black <strong>clays</strong><br />
Figure 7.18. Voids ratio/ log Pressure (e/ log p) curves for black <strong>clays</strong> <strong>an</strong>d red soils.<br />
Results <strong>of</strong> oedometer consolidation tests in terms <strong>of</strong> voids ratio, compression coefficients <strong>an</strong>d/<br />
or indices as well as permeability over the loading r<strong>an</strong>ge <strong>of</strong> 25-800 kPa are summarised in<br />
Table (7.12). Complete results for the loading <strong>an</strong>d unloading stages <strong>of</strong> black <strong>clays</strong> <strong>an</strong>d red soils<br />
are tabulated in Appendix A.<br />
Table 7.12. Derived parameters from results <strong>of</strong> oedometer consolidation tests for the loading<br />
r<strong>an</strong>ge <strong>of</strong> 25-800 kPa in this study.<br />
Sample<br />
t50 Cv<br />
No. E (%) e av (m²/kN) (min) (m²/year) K (m/s) Cc Cs Cα<br />
mv<br />
(m²/MN)<br />
SA2-70cm 0,31-11,11 0,52-0,70 0,000052-0,00045 0,03-0,26 1,00 - 60 0,07-5,08 2,6E-12 - 4,8E-11 0,3 0,07 0,0002-0,009<br />
SA37-50cm 1,84-27,68 0,52-1,06 0,0003-0,0033 0,18-1,62 2,90-55 0,05-1,73 2,94E-12 - 3,94E-10 0,4 0,075 0,003-0,017<br />
SB1-70cm 1,85-19,46 0,65-1,01 0,000148-0,0015 0,09-0,74 0,48-18 0,19-2,36 5,11E-12 - 1,2E-9 0,29 0,043 0,0002-0,006<br />
SB42-50cm 8,02-29,11 0,23-0,59 0,0003-0,0014 0,22-0,80 9,5-50 0,06-0,494 3,92E-12 - 1,23E-10 0,34 0,03 0,005-0,024<br />
SC17-50cm 1,74-20,64 0,37-0,7 0,00028-0,0010 0,17-0,60 9,0- 50 0,07-0,56 1,67E-12 - 3,0E-11 0,44 0,04 0,006-0,016<br />
SC29-50cm 3,33-18,24 0,56-0,84 0,00026-0,0008 0,16-0,44 2,5 -35 0,104-1,97 5,03E-12 - 2,03E-10 0,38 0,065 0,003-0,13<br />
RD1-30cm 10,98-32,07 0,74-1,28 0,00035-0,0047 0,19-2,0 0,35-1,85 1,38-11,85 7,99E-11 - 7,33E-9 0,42 0,03 0,003-0,004<br />
RD1-100cm 7,35-39,01 0,59-1,42 0,00036-0,0074 0,21-2,94 0,98-1,75 1,18-4,67 7,57E-11 - 4,26E-9 0,4 0,03 0,005-0,008<br />
RD1-400cm 3,09-19,60 0,74-1,1 0,00029-0,0024 0,16-1,11 0,40-1,30 2,71-12,14 1,32E-10 - 4,19E-9 0,39 0,02 0,002-0,007