Consolidation Slides

Consolidation
Real Soils
•
nonlinear – stress is not proportional to strain
•
elastoplastic – strain is not fully recovered upon unloading
•
viscoelastic – stress-strain response is time dependent
•
nonconservative – stress-strain response is history dependent
Figure 8.3a
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.3b
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.4a
Coefficient of volume change
∆
∆ ′
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Constrained Modulus
∆ ′
∆
M
1
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.4b
Coefficient of compressibility
∆
∆ ′
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.5a
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.5b
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Total stress
Neutral stress
Effective stress
free
water
surface
d
 = wd
u = wd
´ = 
lake
bed
Total stress
Neutral stress
Effective stress
free
water
surface
d
lake
bed
z
 = satz + w(z+d)
u = w(z+d)
´ = ´z
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.8
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.6
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.9a
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
8
CL
9
CL
10
ML
11
CH
12
SP
13
CH
Figure 8.15a
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.9c
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.9d
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.9h
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)
Figure 8.9h
(Holtz & Kovacs, An Introduction to Geotechnical Engineering, 1981)