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 14.18CTP
(a)
To determine
Find the magnitude, location and direction of the resultant active force
(b)
To determine
Find the magnitude, location and direction of the resultant active force
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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
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 P7.17
Situation 13. A river is 3 m deep with the riverbed consisting of a thick bed of
sand having a saturated unit weight of 19.0 kN/m3³. Determine the resulting
effective vertical stress at 4 m below the riverbed for the following conditions:
36. The water level stays the same.
a. 36.80 kPa
b. 47.20 kPa
37. The water level rises by 2 m.
a. 51.1 kPa
b. 36.80 kPa
38. The water level drops by 2 m.
a. 26.30 kPa
b. 36.80 kPa
c. 26.30 kPa
d. 51.10 kPa
c. 47.20 kPa
d. 26.30 kPa
c. 47.20 kPa
d. 51.10 kPa.
Chapter 14 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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- 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.arrow_forwardI need the complete answerarrow_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
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