Question

**A retaining wall is shown in Figure 4. Given that; H =
9m, H1 = 4, ƴ1 = 16.5KN/m3, ƴ2 = 20.2 KN/m3, Ø’1 = 30, Ø’2 = 34 and
q = 21KN/m2. Determine the Rankine active force, Pa, per unit
length of the wall and the location of the resultant.**

Answer #1

A 6-m-high retaining wall is to support a soil with unit
weight
17.4 kN/m3, soil
Friction angle 26°, and cohesion c14.36 kN/m2. Determine the
Rankine active force per unit length of the wall both before and
after the tensile crack occurs, and determine the line of action of
the resultant in both cases

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 reinforced earth retaining wall is to be 30 ft high (H=30
ft). - Backfill: unit weight 110 pcf, internal friction angle 33° -
Metal strip reinforcement: vertical spacing 3 ft, horizontal
spacing 4 ft, width of reinforcement 5”, yield stress of
reinforcement 35,000 psi, friction angle between the soil and
reinforcement is 24°, FS pullout failure = 2, FS tensile failure =2
- Assume ??′ = 2 3??′ - Corrosion rate: 0.0006 in/year for the 1st
2 year...

21) A person carries a 25.0-N rock through the path shown in the
figure, starting at point A and ending at point B. The total time
from A to B is 1.50 min. How much work did gravity do on the rock
between A and B?
A) 625 J
B) 20.0 J
C) 275 J
D) 75 J
E) 0 J
22) A person carries a 2.00-N pebble through the path shown in
the figure, starting at point A and...

ch 6
1:
It is generally a good idea to gain an understanding of the
"size" of units. Consider the objects and calculate the kinetic
energy of each one.
A ladybug weighing 37.3 mg
flies by your head at 3.83 km/h
.
×10
J
A 7.15 kg
bowling ball slides (not rolls) down an alley at 17.5 km/h
.
J
A car weighing 1260 kg
moves at a speed of 49.5 km/h.
5:
The graph shows the ?-directed force
??...

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