Geoscience Reference
In-Depth Information
p' (MPa)
d
60
(mm)
d
10
(mm)
d
60
/d
10
Material
Before
test
After
test
Before
test
After
test
Before
test
After
test
Initial Final
0.3
0.1
41.0
2.7
15
0.6
0.2
42.6
1.9
22
1.1
0.2
46.5
38.1
5.0
1.7
9
23
2.1
1.0
34.7
1.3
28
3.5
2.0
33.6
0.5
73
0.2
0.5
39.8
1.8
22
1.0
2.2
32.7
0.6
57
46.5
2.9
16
1.5
3.4
30.1
0.4
68
2.5
4.8
30.4
0.2
152
1.2(*)
2.6
26.6
0.2
140
49.3
0.4
130
2.0
4.0
25.8
0.2
136
2.2
1.0
55.3
3.3
17
3.7
1.6
90.6
45.1
10.0
0.9
9
53
5.0
2.5
38.5
0.8
46
(*) Initially consolidated at 2 MPa
Table 4.6.
Triaxial tests. Initial and final effective mean stresses,
d
60
and d
10
diameters before and after tests
4.5. Evolution of density
The evolution of the void ratio with vertical stress, simulating the overburden
effect generated by the very weight of the waste rock stockpiled, was estimated from
laboratory tests roughly reproducing the stress path and the
in situ
conditions. Far
away from the areas of influence of the slopes, the oedometric path acceptably
represents the stress state inside the deposit by supposing that this state is close to
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