This preview shows page 1. Sign up to view the full content.
48
A – B: reloading, “elastic” (recoverable) deformation only
B:
maximum previous preconsolidation pressure, sample moves onto normal (first)
compression line
B – C: normal (first) compression: “elastic” plus plastic (irrecoverable) deformation. Plastic
deformation is due to particle slip
C – D: unloading; “elastic” component of deformation is recovered
The soil is overconsolidated along AB and CD, and normally consolidated along BC.
The slope of the reloading and unloading lines is –
κ
0
; the slope of the onedimensional
normal compression line is 
λ
0
From the graph or the data,
035
.
0
50
ln
100
ln
639
.
1
590
.
1
'
ln
=
−
−
−
=
Δ
Δ
−
=
v
o
v
σ
(the slope of the unloading line), and
094
.
0
100
ln
200
ln
590
.
1
525
.
1
'
ln
=
−
−
−
=
Δ
Δ
−
=
v
o
v
(the slope of the one dimensional normal compression line).
(c) The initial vertical effective stress at the centre of the clay layer is approximately (20
kN/m
3
×
5 m) – (10 kN/m
3
5 m) = 50 kPa. The vertical effective stress is then increased
This is the end of the preview. Sign up
to
access the rest of the document.
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

Click to edit the document details