Geoscience Reference
In-Depth Information
Table 19.5
(
Continued
)
Material type
Poisson
Formulae used
K
o
for varying overconsolidation ratio (OCR)
ratio
for OCR
OCR
1 (N.C.)
235 0 0
=
Clay - PI
12%
0.3 (35)*
K
o (OC)
0.43
0.61
0.74
0.96
1.36
1.92
<
Clay - PI
12-22%
0.4 (20)
K
o (NC)
OCR
1
/
2
0.67
0.94
1.16
1.49
2.11
2.98
=
=
Clays - PI > 32%
0.45 (8)
0.82
1.16
1.42
1.83
2.59
3.67
Undrained Clay
0.5 (0)
1.00
1.41
1.73
2.24
3.16
4.47
•
The strike out has been used to remove the discrepancy.
•
* Approximate “Equivalent'' Friction angle.
Figure 19.2
Lateral earth pressures associated with different wall movements.
19.6 Movements associated with earth pressures
•
The active earth pressures (K
a
) develop when the soil pushes the wall.
•
The passive earth pressures (K
p
) develop when the wall pushes into the soil.
•
Wall movement is required to develop these active and passive states, and depends
on the type and state of the soil.
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