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46
QUESTIONS AND SOLUTIONS: CHAPTER 4
Analysis and interpretation of onedimensional compression test data
Q4.1 (a) What factors govern the relevance to a given design situation of the parameters
obtained from an oedometer test?
(b) Data from an oedometer test are given below. Show that the specific volume v is related to
the sample height h by the expression (v/h) = constant. Plot a graph of specific volume v
against the natural logarithm of the vertical effective stress, ln
σ
'
v
, and explain its shape.
Calculate the values of
κ
o
and
λ
o
.
σ
'
v
, kPa
25
50
100
200
100
50
Equilibrium sample height
h, mm (after consolidation
has ceased)
19.86
19.56 19.27
18.48
18.79
19.08
Water content of sample at the end of the test (
σ
'
v
=50kPa, h=19.08mm): 20.88%
Grain specific gravity G
s
= 2.75
(c) Figure 4.40 shows the ground conditions at the site of a proposed new office building. The
office building will have a raft foundation, the effect of which will be to increase the vertical
effective stress in the clay layer by 50kPa throughout its depth. The oedometer test sample
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 Fall '11
 StuartChalk
 Analytical Chemistry

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