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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An 8 m high retaining wall supports a 5.5 m deep sand (γd = 18.5 kN/m3, Φ = 34°) overlying a saturated sandy clay (γsat = 20.3 kN/m3, Φ = 28°, c = 17kPa). The groundwater level is located at the interface of two layers.
Determine the magnitude (kN) and location (m) of the resultant active force on the 25m long wall.
A frictionless vertical retaining wall has a height of 4 meters and retains a horizontal surcharge of 11 kPa. The unit weight of the backfill is 15 kN/m3 with cohesion of 8 kN/m2 and an angle of friction of 260. Compute the active force (in kN) after the tensile crack.Answer: 26.82
A 5 m-high smooth, vertical wall retains a granular backfill with unit weight of 18 kN/m3 and a friction angle of 35°. Find the magnitude and location of the resultant active thrust. If a 10 kPa uniform surcharge acts at the top of the backfill, find the magnitude and location of the active thrust.
Chapter 16 Solutions
Principles of Foundation Engineering (MindTap Course List)
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- A wall 7m high retains dry sand having a density of 1570 kg/m3 and an angle of shearing resisitance of 34'. Void ratio is 0.60. A. Determine the active thrust in kN per unit length of wall. B. Determine the active thrust in kN per unit length of wall if there is ground water table located 3m below the ground surface. C. Determine the location of the resultant thrust from the bottom of the wall, if there is ground water table located 3m below the ground surface.arrow_forwardSOLVE FOR THE LOCATION AND MAGNITUDE OF THE PASSIVE AND ACTIVE THRUST OF THE RETAINING WALL. Along the passive side, the soil has the following properties: unit weight: 16 kN/m3, cohesion = 30 KPa, angle of internal friction = 25 degrees. and along the active side: sand: unit weight = 15 KN/m3, angle of internal friction = 30 degrees, and for clay: dry unit weight = 16.5 KN/m3, saturated unit weight = 19 kn/m3 , unconfined compressive strength = 48 KPa, angle of inter friction is 25 degrees. The heightarrow_forwardA smooth vertical wall retains a sandy backfill underlain by clay with a surcharge q=200 kN/m.Assuming the entire soil is in the Rankine active state. Determine the magnitude and location of the resultant active force on the wall.arrow_forward
- a retaining wall supports a horizontal backfill that is composed of two types of soil. first layer: 4.92 meters high, Unit weight of 16.29 kN/m^3, coefficient of active pressure of 0.296 second: 6.85 meters high, Unit weight of 18.31 kN/m^3, coefficient of active pressure of 0.302 determine the distance of the total active force measured from the bottom of the wallarrow_forwardA retaining wall supports a horizontal backfill that is composed of two types of soil. First layer: 4.27 meters high, Unit weight of 17.25 kN/m3, coefficient of active pressure of 0.286 Second layer: 6.27 meters high, Unit weight of 18.27 kN/m3, coefficient of active pressure of 0.309 Determine the distance of the total active force measured from the bottom of the wall. Round off to three decimal places.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_forward
- Determine the total active thrust, in kN/m, for a retaining wall (height 5.12 m.) with horizontal backfill given the following properties: Unit weight = 17.79 kN/m3, Angle of internal friction = 30°, Cohesion = 11.71 kPa, and Surcharge = 9.33 kPa.arrow_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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