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 14.7P
(a)
To determine
Find the location and magnitude of the thrust on the wall for active state.
(b)
To determine
Find the location and magnitude of the thrust on the wall for at-rest state.
(c)
To determine
Find the location and magnitude of the thrust on the wall for passive state.
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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.
A 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.
Q. Result. Thurst
Chapter 14 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- A braced wall is shown in Figure 14.20. Given: H = 7 m, naH = 2.8 m, =30, =20, = 18 kN/m3, and c = 0. Determine the active thrust, Pa, on the wall using the general wedge theory. Figure 14.20arrow_forwardQ2 A smooth backed wall is 6m height and retain a soil with the properties shown in the Figure below. If the soil surface carries a uniform distribution pressure of 50 kN/m*. Determine the total Rankine active stresses on the wall and its positions. q-50 kN/m? Sand y= 20 kN/m Ø' = 20°arrow_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_forward
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