Principles Of Foundation Engineering 9e
9th Edition
ISBN: 9781337705035
Author: Das, Braja M.
Publisher: Cengage,
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Chapter 16, Problem 16.5P
To determine
Find the magnitude and location of the thrust on the wall.
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16.5 The backfill retained by a gravity retaining wall shown in
Figure P16.5 consists of two sand layers, compacted at dif-
ferent densities. The properties of the sand are shown in the
figure. Assuming that the gravity wall does not move later-
ally (i.e., at-rest), determine the magnitude and location of
the thrust on the wall.
FIGURE P16.5
2 m
3 m
Sand 1
y = 17.5 kN/m³; ' = 32°
Sand 2
y = 17.5 kN/m³; ' = 36°
It was found that the backfill against a retaining wall (6 meters in height as shown in
Figure 3) has specify weight y= 16 kN/m³ when its water content w= 5 %, S = 0.12, its
internal friction angle was measured as 30° (take G,= 2.7 and xw = 10 kN/m³).
a. Predict distribution of lateral stress on this retaining wall along its depth in its “at
rest" state, and its resultant force.
b. Rain leads the backfill water content increase to 10% in its upper half, and
saturated in its lower half, find and plot its lateral stress and pore pressures along
its depth in an active state.
7.17 A soil profile consists of a clay layer underlain by a sand
layer, as shown in Figure P7.17 If a tube is inserted into
the bottom sand layer and the water level rises to 1 m
above the ground surface, determine the vertical effec-
tive stresses and porewater pressures at A, B, and C. If
K, is 0.5, determine the lateral effective and lateral total
stresses at A, B, and C. What is the value of the pore-
water pressure at A to cause the vertical effective stress
there to be zero?
GWL
|1 m Y- 18.5 kN/m
Clay
2m Yu- 19.0 kN/m
1.5 m Yur=17.0 kN/m
Sand
2m
E
Chapter 16 Solutions
Principles Of Foundation Engineering 9e
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Similar questions
- a) Referring to Figure Q2 (a), the vertical stress increase at point A is 25 kN/m² due to application of line loads q1 and q2. Determine the magnitude of q2. 91 = 150 kN/m %3D 92 55° 1.5m 3m 2.7m FIGURE Q2 (a)arrow_forward3.9 Figure P3.3 shows the plan of a loaded area on the surface of a clay layer. The uniformly distributed vertical loads on the area are also shown. Determine the vertical stress increase at A and B due to the loaded area. A and B are located at a depth of 3m below the ground surface. Uniformly distributed vertical load 4₂ = 200 kN/m² ר 2 m 3 m PLAN Uniformly 3 m distributed load on a flexible arca a.~100 kN/m²arrow_forwardINDUCED LOADS ARE APPLIED ON THE GROUND SURFACE AS SHOWN. POINT LOADS: PA= 250KN PB= 175KN PC= 300KN LINE LOAD: Q1= 150KN/M Q2= 225KN/M DETERMINE: a. THE TOTAL VERTICAL STRESS INCREASE AT POINT A AT A DEPTH OF 5M DIRECTLY UNDERNEATH LINE AB.b. THE TOTAL VERTICAL STRESS INCREASE AT POINT O, 8M FROM A TO THE POSITIVE Y AXIS, PERPENDICULAR TO LINE AB AT THE SAME DEPTH.c. THE TOTAL VERTICAL STRESS INCREASE DIRECTLY AT A POINT BELOW THE LINE LOAD 1, PERPENDICULAR TO POINT O AT THE SAME DEPTH.arrow_forward
- 7.17 A soil profile consists of a clay layer underlain by a sand layer, as shown in Figure P7.17. If a tube is inserted into the bottom sand layer and the water level rises to 1 m above the ground surface, determine the vertical effec- tive stresses and porewater pressures at A, B, and C. If K, is 0.5, determine the lateral effective and lateral total stresses at A, B, and C. What is the value of the pore- water pressure at A to cause the vertical effective stress there to be zero? GWL 11 m Y=18.5 kN/m? Clay 2 m Y= 19.0 kN/m³ 2: 1,5m Y =17.0 kN/m Sand 2 m FIGURE P7.17arrow_forwardRefer to Figure P6.3. Determine the vertical stress increase Δσ at point A with the values q1 = 90 kN/m, q2 = 325 kN/m, x1 = 4 m, x2 = 2.5 m, and z = 3 m.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
- The channel section shown in Figure is subjected to a vertical shear force of V= 31 kN. Calculate the horizontal shear stress t4 at point A, and the vertical shear stress 73 at point B. 12 mm 12 mm 76 mm 16 mm 50 mm 125 mm 125 mmarrow_forwardProblem 1. Consider the T-beam as shown in the figure. a) Determine the maximum shear stress at the critical section where the internal shear force is the maximum. b) Determine the maximum shear stress at point C. Sketch the shear stress distribution along the depth of the beam. 10 kN/m A 3 m 1.5 m 150 mm C 150 mm 30 mm 30 mm B 1.5 marrow_forwardReferring in the Fig. 2 below, B = 6m and q =150 kPa. For Point P, z = 2m and x = 1.5m. Determine the vertical stress at Point P.arrow_forward
- Prob. 3 The plan of a flexible rectangular loaded area is shown in Figure below. The uniformly distributed load on the flexible area, q, is 100 kN/m². Determine the increase in the vertical stress, Aoz, at a depth of z = 2 m below a. Point A b. Point B c. Point C 4 m 1.6 m 2 m 0.8 m q = 100 kN/m² A 1.2 m-arrow_forwardThe channel section shown in Figure P9.65 is subjected to a vertical shear force of V = 7 kips. Calculate the horizontal shear stress TA at point A, and the vertical shear stress TB at point B. 2 in. 0.25 in. B 3 in. 0.20 in. -0.20 in. 8 in. FIGURE P9.65arrow_forward7.8 [Use Eq. (7.26).] Figure P7.8 shows an embankment load on a silty clay soil layer. Determine the stress increase at points A, B, and C, which are located at a depth of 5 m below the ground surface.arrow_forward
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