Geoscience Reference
In-Depth Information
Figure 5.13
Illustration of symbols used in consolidation analysis for peat.
For clay, the log time method proposed by Casagrande and Fadum in 1940 or the
square root time method as suggested by Taylor in 1942 is normally used to evaluate
c
v
.
For peat, the method illustrated in Figure 5.13 is usually applied. Primary compression
(consolidation,
C
p
) is a stage from the end of consolidation of the previous stage to the
end of the 'primary' stage of the stage considered - that is, compression accompanied by
dissipation of excess pore water pressure as defined above. The time elapsed is denoted
t
p
. Initial compression (
C
i
) is the amount of compression which occurs from the instant
of loading (
t
15 s (0.25min), being the time at
which the first sensible settlement reading can usually be observed (
d
o
). Compression
=
0) to the arbitrarily selected time
t
=
