Geoscience Reference
In-Depth Information
Figure 5.22
Ratio of compressibility (
c
α
/
c
c
) versus consolidation pressure for fibrous peat (
after
Kazemian and Huat, 2009a).
Figure 5.23
Settlement vs. time curve at the centre of Middleton Test Fill.
log (creep rate) curves, and asserted that the false effects of resetting of time-zero are
circumvented in this manner. However, at large time the different is small, so strain-
log
t
curves that steepen after long periods probably represent tertiary compression.
The term 'tertiary' compression was introduced as a convenience device to designate
increasing
c
α
with time.
Figure 5.24 illustrates the tertiary phase, following the secondary and primary
phases. Figure 5.25 shows a plot of log strain rate versus log time.
5.3 HYDRAULIC CONDUCTIVITY
The physical structure and arrangement of constituent particles, e.g. fibres and gran-
ules, in peat greatly affect the size and continuity of pores, resulting in a wide range
