Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
Chapter 16, Problem 16.6P
(a)
To determine
Find the maximum tensile stress within the clay.
(b)
To determine
Find the depth of the tensile crack.
(c)
To determine
Find the magnitude and location of the active thrust.
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1. A vertical retaining wall has a height of 5.5m. it supports a soft backfill with a unit weight of 15.5 KN/m³ and has a cohesion of 16.6 KN/m². The undrained angle friction is 0
Determine the
A. Max. Depth of the tensile crack
B. The lateral force before tensile cracks occur
C. The lateral force after tensile cracks occur
A 5 m high retaining wall is supporting the soil having properties as shown below:
5m
$ = 30°
c = 10 kN/m²
Y=17.5 kN/m
3
The Rankine active earth pressure (per meter length) on the wall after the formation of tensile
crack is
A retaining wall 6 m high with a vertical back face retains a homogeneous saturated soft clay. The saturated unit weight of the clay is 19.8 kN/m^3. Laboratory tests showed that the undrained shear strength, cu, of the clay is 14.7 kN/m^2.
a. Do the necessary calculations and draw the variation of Rankine’s active
pressure on the wall with depth.
b. Find the depth up to which a tensile crack can occur.
c. Determine the total active force per unit length of the wall before the tensile crack occurs.
d. Determine the total active force per unit length of the wall after the tensile crack occurs. Also find the location of the resultant.
Chapter 16 Solutions
Principles of Foundation Engineering (MindTap Course List)
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Similar questions
- syarrow_forwardPlease answer 13.21arrow_forwardA retaining wall 6 m high with a vertical back face has c'- ϕ' soil for backfill. For the backfill, γ = 18.1 kN/m^3, c' = 29 kN/m^2, and ϕ' = 18˚. Taking the existence of the tensile crack into consideration, a. determine the active force, Pa, per unit length of the wall for Rankine’s active state. b. determine the passive force, Pp, per unit length for Rankine's passive state.arrow_forward
- Given the height of the retaining wall, H is 6.4 m; the backfill is a saturated clay with f 5 08, c 5 30.2 kN/m2 , gsat 5 17.76 kN/m3 , a. Determine the Rankine active pressure distribution diagram behind the wall. b. Determine the depth of the tensile crack, zc. c. Estimate the Rankine active force per foot length of the wall before and after the occurrence of the tensile crack.arrow_forwardA smooth, vertical wall retains a 7 m-high granular backfill with the ground level being horizontal. The water table lies at a depth of 3 m from the top. The friction angle of the backfill is 32°. The bulk and saturated unit weights of the soils are 16.5 kN/m3 and 18.0 kN/m3, respectively. Assuming the soil is in the active state, determine the magnitude and location of the horizontal thrust on the wall.arrow_forward1. Refer to Figure below For H = 6 m, y = 17.0 kN/m³, o' = 36°, c' = 0, ß = 85°, a = 10°, and 8' = 24°, assume that the backfill is in the active state and use Coulomb’s equation to determine the magnitude, location, and direction Pa of the active thrust on the wall. H 2. what would be the active thrust Pa there is a surcharge of 25 kN/m² at the ground level? whenarrow_forward
- A rigid smooth retaining wall of height 7 m with vertical back face retains saturated clay as backfill. The saturated unit weight and undrained cohesion of the backfill are 17.2 kN/m² and 20 kPa respectively. The difference in the active lateral forces on the wall (in kN per m length of wall) up to two decimal places, before and after the occurrence of tension cracks isarrow_forwardplease, solve question 16.3 question in figurearrow_forwardQ5) Refer to the Figure below. Given the height of the retaining wall, H is 5.4 m; the backfill is a saturated clay with Ø' = 0, c= 40 kN/m2, ysat = 19.5kN/m, a. Determine the Rankine active pressure distribution diagram behind the wall. b. Determine the depth of the tensile crack, zc. c. Estimate the Rankine active force per meter length of the wall before and after the occurrence of the tensile crack. Wall movement to left 45 + d'/2 45 + 6'/2 Rotation of wall about this point (а)arrow_forward
- Determine the magnitude and the location of the active thrust on the smooth vertical wall shown assuming that the entire backfill is in the active state.arrow_forward2. Figure 2 shows a non-yielding vertical wall retaining a sandy backfill underlain by clay. Determine the magnitude of the resultant at-rest force per unit length on the wallI, Pa Sand y= 18 kN/m d'= 34", e 0 OCR = 2 4m G.W.T 2 m Clay Yu=19 kN/m LL = 36, PL = 14. OCR = 3 Figure 2arrow_forwardA retaining wall supports a horizontal backfill that is composed of two types of soil. The first layer is 5.71 meters high. It has a unit weight of 16.03 kN/m3. The second layer is 6.21 meters and has a unit weight of 18.46 kN/m3. If the angle of friction for both layers is 37°, determine the total active force (kN) acting on the retaining wall per unit width.arrow_forward
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