Civil Engineering Reference
In-Depth Information
Figure 12.6
Hardening and softening for Cam clay.
12.6 Complete constitutive equations for ordinary
Cam clay
The complete constitutive equations for Cam clay are obtained simply by adding the
elastic strains given by Eqs. (11.3) and (11.4) to the plastic strains given by Eqs. (12.14)
and (12.15) to obtain
λ
−
κ
M
p
1
vp
λ
−
κ
M
(
M
g
3
q
+
δε
=
−
η
)
+
δ
δ
(12.16)
s
λ
−
κ
M
λ
−
M
(
M
p
1
vp
q
+
−
η
)
δε
=
δ
+
κ
δ
(12.17)
v
These apply for states that are on the state boundary surface; for states inside the
boundary surface the elastic strains given by Eqs. (11.3) and (11.4) can be recovered
by putting
λ
=
κ
into Eqs. (12.16) and (12.17).
