Question

) 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 and 0.0002 in/year thereafter.

Calculate the factors of safety of the MSE wall in Prob. 2 against (a) sliding, (b) overturning, and (c) bearing capacity failures. Assume: i) ??′ = 2 3??′ ii) Tie length is constant with depth iii) Requires minimum wall embedment depth iv) Soil properties (ground): γ2=17.5 kN/m3 , φ2’=30°, c2’=10 kN/m2 v) weight of the facings is ignored

Answer #1

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....

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.

when you have a thin flexible retaining wall with height 10 ft,
unit weight of soil 110 pcf, international friction angle 25
degree, zero cohesion what will be resultant lateral force per unit
length acting on the wall in lbs?

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...

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-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

A 10 ft wall retains soil with a horizontal surface that has 115
pcf unit weight, a friction angle of 26 degrees, and an effective
cohesion c’= 50 psf. The water table is at 5ft depth. Assuming
Rankine active lateral earth pressures and hydrostatic conditions,
what is the total horizontal thrust that the wall feels

A retaining wall 30 m high was designed to stabilize a
horizontal ground surface.
The back of the wall is inclined 15 degrees to the vertical
direction and can be assumed rough with interface friction angle of
30 degrees.
(a) Draw a diagram to show the given wall dimensions, relevant
inclinations, and the direction of the active force on the
wall.
(b) Calculate the lateral force on the wall assuming the
groundwater table is at the base of the wall....

1.) The pile load test data of a 300 mm diameter and 15 m long
pile is as
follows . Design a pile group system to carry a load of 4000 kN.
Compute
the settlement of the pile group for the designed load.
Load in kN
0
500
1000
1500
2000
2500
Settlement in mm
0
8.5
16.5
25.5
38.0
60.0
2.) Design a retaining wall for a 8 m sandy soil backfill with unit
weight as
17.5...

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