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52
221
.
0
200
ln
800
ln
829
.
1
136
.
2
'
ln
=
−
−
=
Δ
Δ
−
=
v
o
v
σ
λ
(the slope of the one dimensional normal compression line).
The preconsolidation pressure (i.e. the maximum previous value of vertical effective stress, at
which the soil moves from a reload line onto the one dimensional normal compression line, is
'
v, maximum previous
= 200 kPa
(see above)
Q4.3 For the oedometer test described in Q4.2, plot a graph of vertical effective stress
σ
'
v
against vertical strain
ε
v
. For each of the loading and unloading steps, calculate the one
dimensional modulus E'
o
=
Δσ
'
v
/
Δε
v
(
Δσ
'
v
and
Δε
v
are the changes in vertical effective
stress and strain that occur during the loading or unloading step.) Comment briefly on the
significance of these results in the context of the selection of parameters for design.
Q4.3 Solution
For each load increment or decrement, the onedimensional modulus E'o is defined as the
change in vertical effective stress
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This note was uploaded on 12/28/2011 for the course CHM 4302 taught by Professor Stuartchalk during the Fall '11 term at UNF.
 Fall '11
 StuartChalk
 Analytical Chemistry

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