Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Question
Chapter 14, Problem 14.6P
(a)
To determine
Find the maximum tensile stress within the clay.
(b)
To determine
Find the depth of the tensile cracks.
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A 6m high retaining wall is to support a soil with a unit weight of 17.4 kN/m^3 , soil friction angle of 26 degrees and cohesion of 14.36 kN/m^2. Determine the Rankine active force per unit length of wall before the tensile crack. Determine the Rankine active force per unit length of wall after the tensile crack occurs. Determine the location of the acitve force after the tensile crack occurs.
A 6 m high retaining wall is to support a soil with a unit weight of 17.4 kN/m3, soil friction angle of 26° and cohesion of 14.36 kN/m2.
Determine the Rankine active force per unit length of the wall before the tensile crack.
Determine the Rankine active force per unit length of the wall after the tensile crack occurs.
Determine the location of the active force after the tensile crack occurs.
A cohesive soil backfill has cohesion of
3 t/m², + = 0° and y = 3 t/m³,
3
t/m³, the depth
of tension crack developing in the backfill
would be
Chapter 14 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- Considering that the horizontal thrust from the back of a 5.5 m wide brick wall to the 1 m deep part of the wall is H = 55 kN a) Find the greatest stress in the base when b = 2 m.b) Find the width b so that there is a shrinkage zone at the base.(Note: unit weight of brick wall ỿ = 24 kN / m3 ) Answer: ϭmax=0,30 Mpa, b=2,23 marrow_forward3. A 15 ft high retaining wall with vertical back face retains a homogeneous saturated soft clay. The saturated unit weight of the clay is 122 Ib/ft³. Laboratory tests showed that the undrained shear strength, cu, of the clay is equal 350 lb/ft?. 0=0. a. Find the depth up to which the tensile crack can occur. b. Determine the total active force per unit length of the wall before the tensile crack occurs. C. Determine the total active force per unit length of the wall after the tensile crack occurs.arrow_forward1. 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 occurarrow_forward
- 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.arrow_forwardA frictionless retaining wall is shown in the figure below. q=10 kN/m² 7=15 kN/m³ = 26° c' = 8 kN/m² Determine: a. The active force after the tensile crack occurs. (kN/m) b. The passive force. (kN/m) c. Location of passive force from the base of the wall (m)arrow_forwardAn 8 m tall retaining wall holds cohesionless sand with a density and angle of internal friction of 1.85 Mg/m3 and 33°, respectively. If the surface of the backfill slopes upwards at 86° to the vertical, Use Rankine’s conditions to find the force per unit length of the wall and its location for (a) Active State (b) Passive State Please draw the pressure diagram neatly for both casesarrow_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 frictionless vertical retaining wall has a height of 4 m. and retains a horizontal surcharge of 10 kPa. Unit weight of the backfill is 15 kN/m3 with a cohesion of 8 kN/m2 and an angle of friction of 26°.• Compute the max depth of the tensile crack.• Compute the active force after the tensile crack occurs.• Compute the passive resistance per unit width of the wall.arrow_forwardA 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 isarrow_forward
- 3. Compute the resultant lateral force for the soil-wall system shown in Figure 3. You may ignore tensile cracks. Use • A- Coloumb • B - Rankine 0=30°, y=20kN/m³ 4m Ground water table 7m c=50KN/m², p=10°, y=18KN/m³ 0=25°, y=20KN/m³ 8 m Gravity wall Figure 3arrow_forwardA 6m retaining wall is supporting a soil with the following properties:Unit weight = 16 KN/cu.mAngle of internal friction = 25ºCohesion = 14 Kpaa. Assuming no tensile cracks occurs in the soil; determine its normal pressure acting at the back of the wall.b. If tensile crack occurs in the soil, calculate its active pressure acting on the wall.c. Find the location of tensile crack measured from the surface of horizontal backfill.arrow_forward6. A normal fault that is partly cemented with calcite mineralization dips 65 from horizontal. The fault slipped when the water pressure reached 10 MPa at a depth of 600 m. If S, = 1 MPa and , = 35°, what was the horizontal stress before the fault slipped? %3Darrow_forward
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