Civil Engineering Reference
In-Depth Information
Figure 22.6
Bearing capacity factors for undrained loading of foundations.
(b) Drained loading
The gross bearing capacity of the simple shallow foundation shown in Fig. 22.7(a) for
drained loading is
2
(γ
−
γ
1
D
)
N
q
q
c
=
)
BN
γ
+
(γ
−
γ
−
+
p
0
(22.10)
w
w
where
N
γ
and
N
q
are bearing capacity factors and
p
0
is the total stress at the level of
the base of the foundation.
N
q
is the contribution to the bearing capacity arising from the surcharge stress acting
at the level of the base of the foundation. In Sec. 19.11 we obtained equal upper and
lower bounds for a simple long foundation with a surcharge
p
acting at the surface
