Compressibility Characteristics of Fibrous Tropical Peat ... - Ejge.com
Compressibility Characteristics of Fibrous Tropical Peat ... - Ejge.com
Compressibility Characteristics of Fibrous Tropical Peat ... - Ejge.com
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Vol. 14, Bund. C 10<br />
Coefficient <strong>of</strong> <strong>com</strong>pressibility,<br />
mv (m2/MN)<br />
1.6<br />
1.2<br />
0.8<br />
0.4<br />
0<br />
0 100 200 300 400<br />
Consolidation Pressure (kPa)<br />
Untreated <strong>Peat</strong><br />
Sample A<br />
Sample B<br />
Sample C<br />
Sample D<br />
Figure 9: coefficient <strong>of</strong> volume <strong>com</strong>pressibility versus consolidation pressure.<br />
It should be noted that, the declining <strong>of</strong> the coefficients <strong>of</strong> volume <strong>com</strong>pressibility gradually,<br />
means the minimum consolidation pressure in this study (50kPa) is more than pre-consolidation<br />
pressure samples. Otherwise, due to consolidation pressure is lower than the pre-consolidation<br />
pressure, the soil sample swell then lower value was obtained for the coefficient <strong>of</strong> volume<br />
<strong>com</strong>pressibility (m v ) under consolidation pressure <strong>of</strong> 50 kPa.<br />
CONCLUSIONS<br />
This study was conducted to explore the influenced <strong>of</strong> the various quantities <strong>of</strong> cement on<br />
<strong>com</strong>pressibility parameters <strong>of</strong> fibrous peat by installing a cement column in undisturbed soils. In<br />
all, 4 cement ratio (10, 20, 30, and 50%) were added to undisturbed fibrous peat soil which taken<br />
from below the water table, as well as laboratory and field data on fibrous peats from the<br />
literature.<br />
The specimens were then cured in water which was collected from the peat site. Then, <strong>com</strong>pressibility<br />
behavior <strong>of</strong> the peat soil was determined by Rowe Cell consolidation test for both the<br />
natural (untreated) and reinforced fibrous peat by cement columns for consolidation pressure 50,<br />
100, 200, and 300 kPa.<br />
The following conclusions are based on the analyses, data, and interpretation presented in this<br />
paper:<br />
1. The coefficient <strong>of</strong> consolidation (C v ) is in the range <strong>of</strong> 4.95-2.78 (m 2 /year) and 4.21-2.05<br />
(m 2 /year) for untreated peat soil and reinforced peat soil by cement 50% for consolidation<br />
pressure <strong>of</strong> 50-300 kPa, respectively. The coefficient <strong>of</strong> consolidation is decreased by increasing<br />
the load and cement ratio simultaneously.<br />
2. The <strong>com</strong>pression index (C c ) values from Rowe Cell consolidation test for the natural fibric<br />
peat, sample A, B, C, and D; were 1.809, 1.723, 1.467, 1.343, and 1.098 respectively, for<br />
consolidation pressure <strong>of</strong> 50 kPa. It means by increasing the cement ratio the <strong>com</strong>pression index<br />
(C c ) is decreased gradually.<br />
3. The ratio <strong>of</strong> <strong>com</strong>pressibility (C α /C c ) <strong>of</strong> peat is increased by increasing the consolidation<br />
pressure, in addition, it is influenced with the addition <strong>of</strong> cement and it is declined. The low <strong>of</strong>
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