Page 87 - Reservoir Geomechanics
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71 Basic constitutive laws
a.
20 STATIC
DYNAMIC
18
16
14
Pressure (MPa) 10
12
8
6
4
2
0
0 0.02 0.04 0.06 0.08 0.1
Volumetric strain
b.
STATIC
10
DYNAMIC
8
Pressure (MPa) 6
4
2
0
0.035 0.04 0.045 0.05 0.055 0.06 0.065 0.07
Volumetric strain
Figure 3.7. (a) Hydrostatic loading and unloading cycles of a saturated, uncemented Gulf of
Mexico sand that shows the clear difference between static and dynamic stiffness, especially for
loading cycles where both elastic and inelastic deformation is occurring (after Zimmer 2004).
(b) An expanded view of several of the cycles shown in (a).
