Geoscience Reference
In-Depth Information
Figure 3.21
Natural water content vs. liquid limit (
after
Kazemian
et al
., 2009).
3.13.2 Water content vs. liquid limit
Figure 3.21 shows the graph of natural water content (w) versus liquid limit (LL). The
liquid limit of the peat increases with increasing natural water content. For the tropical
hemic peat of Malaysia, the liquid limit is in the range 200-500%, about the same
range as that of temperate (fen) peat.
3.13.3 Organic content vs. liquid limit
Figure 3.22 shows the graph of organic content versus liquid limit. In general, the
liquid limit of peat increases with increasing organic content.
Skempton and Petley (1970) derived the following equation which relates LL and
N for temperate peat as
LL
=
0
.
5
+
5
.
0
N
(3.13)
where
LL
is liquid limit and
N
is ignition loss, both expressed as ratio. However, the
above equation does not seem to fit well for the case of tropical peat.
3.13.4 Natural water content vs. dry density
Figure 3.23 shows the graph of dry density (
ρ
d
) and water content (
w
) for soils. The
best fit is given by the equation
0
.
317)
−
0
.
982
ρ
d
=
0
.
872(
w
+
(3.14)
