Civil Engineering Reference
In-Depth Information
failed drainage system condition, also calculate the total force on the wall if the soil behind
the retaining wall should liquefy during the earthquake. For both the static and earthquake
conditions, assume that there is no water in front of the retaining wall (i.e., only a ground-
water table behind the retaining wall).
Answer:
Static condition:
P
A
30 kN
m (initial con-
dition). With a rise in water level the force acting on the wall
59.4 kN
m. Earthquake
condition:
P
L
90 kN
m.
Restrained Retaining Wall
10.19
Use the data from the example problem in Sec. 10.5.3. Use the simplified Wood
equation to determine the pseudostatic force
P
ER
acting upon the restrained retaining wall. For
the determination of the pseudostatic force
P
ER
, assume that the backfill soil, bearing soil, and
soil located in the passive wedge will not be weakened by the earthquake. Compare this value
to
P
E
and the value calculated in Sec. 10.5.3.
Answer:
From Sec. 10.5.3,
P
E
2540 lb
ft
and
P
ER
3800 lb
ft. Using the simplified Wood equation,
P
ER
8800 lb
ft.
