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12
16% Fine content
18.5% Fine content
10
Residual Strenght friction line
S
u
/
σ
'
30
= 0.29 - 0.33
Strength
8
Peak strenght envelope
(Dawson, Morgenstern
and Stokes, 1999)
strength
Steady-state
friction line
φ
'
= 36º - 39º
6
4
2
0
0 2 4 6 8 1 0 1 2
E ffective Mean Stress p'=(σ'
1+
σ'
3
)/2 (x 0.1 MPa)
Figure 4.10.
Stress paths derived from CIU triaxial test run on
the fine matrix leached waste rock
[VAL 04]
Shear Strength
τ
(x 0.1 MPa)
40
ROM Waste Rock (Homothetic)
Leached Waste Rock (Homothetic)
Leached Waste Rock (< 8")
Crushed Waste Rock (Homothetic)
2
30
4
3
1
20
Marsal, R. and Resendiz, D. (1975)
Diorita El Infiernillo
Basalto San Francisco (Grain Size 1)
Basalto San Francisco (Grain Size 2)
Toba de Las Piedras (Grain Size C)
Conglomerado silicificado El Infiernillo
10
0
0
1 0
2 0
3 0
4 0
E ffective Normal Stress
σ
'
n
(x 0.1 MPa)
Figure 4.11.
Envelopes of the waste rock in the Mohr plane.
Copper mine samples
[BAR 07a]
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