Question

Consider a vertical wall 3 m high. The soil behind it is a clean
loose sand, specific weight= 17:6kN/m3 ; phi = 36.

The backfill is level. Determine the following:

(a) Total force on the wall, at-rest conditions.

(b) Location of the resultant.

(c) Magnitude of lateral earth pressure at top of wall.

(d) Magnitude of lateral earth pressure at base of wall.

(e) The force on the wall for the Rankine active condition.

(f) The distance the top of the wall must rotate to achieve full
Rankine active pressure.

(g) The force on the wall for the Rankine passive condition.

(h) The distance the top of the wall must rotate to achieve full
Rankine passive pressure.

Answer #1

a five meter retaining wall has to retain backfill of sandy soil
having a unit weight 18.2 kn/m3 and angle of internal friction 32
degree,the surface of the backfill in inclined at an angle of 10
degree to the horizontal determine:the magnitude and point of
application of the active thrust on the wall,draw a diagram of
given situation ,and determine total active earth pressure acting
with vertical or with horizontal.

For the 8m high retaining wall, the top layer is sand with
internal friction angle Ø=25° and unit weight is 18.2 kN/m3 and the
bottom layer is gravel with internal friction angle Ø=33° and unit
weight is 21.8 kN/m3 . There is no cohesion in both of the soil
layers. Calculate the thrust per meter length of the wall Pa and
draw the lateral earth pressure diagram.

A 6.3 m high retaining wall supports a 4.5 m soil backfill
having a cohesion of 25 kPa and an angle of internal friction of 30
̊. The soil backfill was subjected to a laboratory test it was
found out that it has a moist volume of 0.01055 m3, a moist weight
of 0.1935 kN. After oven drying, it has a weight of 0.1668 kN and
from analysis it has a combined volume of air and water of
0.004477479 m3....

Determine the total force per unit length acting on a 3.6 m high
retaining wall. The soil that is backfilled level behind the wall
is a granular soil with a total unit weight of 18.4
kN/m3 and a saturated unit weight of 19.5
kN/m3. The at-rest earth pressure coefficient for the
soil is 0.47. The water table is expected to raise to a depth of
2.5 below the ground surface. A surcharge of 59 kPa is applied
above the soil...

Determine the total force per unit length acting on a 4.8 m high
retaining wall. The soil that is backfilled level behind the wall
is a granular soil with a total unit weight of 18.2
kN/m3 and a saturated unit weight of 19.6
kN/m3. Use an at-rest earth pressure coefficient for the
soil which has an internal angle of friction of 26 degrees. The
water table is expected to rest at a depth of 1.5 below the ground
surface. Report...

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