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 17, Problem 17.1P
(a)
To determine
Whether the statement “Poisson’s ratio of any saturated clay is 0.5” is true or false.
(a)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • Poisson’s ratio is the measure of lateral expansion or contraction compared to longitudinal contraction or expansion.
- • The expansion and contraction of saturated clay is very low. Hence, there is no variation of Poisson’s ratio in the saturated clay.
Therefore, the given statement is
(b)
To determine
Whether the statement “A flexible foundation carrying a uniform pressure will settle uniformly” is true or false.
(b)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • A flexible foundation produces a sagging profile of settlement when it is loaded with uniform pressure.
- • In the sagging profile, the settlement at mid-point is higher than the corner. Hence, the differential settlement occurs in the flexible foundation.
Therefore, the given statement is
(c)
To determine
Whether the statement “A rigid foundation settling uniformly will not apply uniform pressure to the soil” is true or false.
(c)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • The pressure is redistributed at the area of contact between the foundation and soil for a rigid foundation with uniform settling.
- • Hence, the pressure is not applied uniformly to the soil.
Therefore, the given statement is
(d)
To determine
Whether the statement “The soil stiffness beneath a continuous foundation on sands is more than that of a square foundation of the same width” is true or false.
(d)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • The contact area between the soil and the continuous foundation is more than the square foundation.
- • Hence, the stiffness is more in continuous foundation compared to square foundation of the same width.
Therefore, the given statement is
(d)
To determine
Whether the statement, “Strain beneath a footing on sands is the maximum at the footing level” is true or false.
(d)
Expert Solution
Answer to Problem 17.1P
The given statement is
Explanation of Solution
- • Generally, the strain varies from zero at the bottom of footing and maximum at 0.5B depth and then becomes zero at the 2B depth. Here, B is the breadth of footing.
- • Also, according to Schmertmann’s method of strain variation, the strain will be zero at the footing level.
Therefore, the given statement is
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Chapter 17 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
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Similar questions
- Exercise 4.2 The plan of a foundation is given in Fig. 1. The uniform pressure on the soil is 40 kPa. Determine the vertical stress increment due to the foundation at a depth of 5 m below the point X 3 m 3 m 3 m 2 m 1.5 m 2 m 0.5 mt soil mechanicsarrow_forwardA square footing supporting a column applies a uniform pressure of 100 kPa on top of a deep clay deposit. Based on the bulbs of pressure developed below the footing shown in the following figure, which of the following statements are correct (select all that apply)? A.Immediately after construction, the effective vertical stress developed at Points B and C is the same. B.Immediately after construction, the excess pore water pressure (∆u) developed at Point B is lower than ∆u developed at Point A. C.After construction, the excess pore water pressure at Point C dissipates faster than that dissipated at Point B. D.arrow_forwardQUESTION 2 A rectangular footing 1000 x 2000 mm shown below is subjected to a vertical point load of 600 kN acting at eccentricities ex = 200 mm and eyy = 100 mm, as show on the Figure below. Calculate the stresses at the corners A and D, and sketch the stress distribution along the face A-D. е 200 mm Vertical force = 600 kN B eyy =100 mm 1 m D. 2m Rectangular footing - Planearrow_forward
- A concrete foundation rests on the surface of a soil mass. Determine the vertical stress increase at point A. 3 m 1 m 1.5 m A PLAN 1.5 m Fondation Load 2800 KN | 2 m SECTION А Soilarrow_forwardA foundation (Figure 1) transmits a stress of 100 kPa on the surface of a soil deposit. a. Evaluate increases of vertical stresses points A, B, and C at the depth of 2m and Sm (2 points) b. At what depth is the increase in vertical stress below A less than 10% of the surface stress? 6 m +2 m- A 2 m -4 m- Figure 1: Plan of foundationarrow_forwardQ-1) Determine the immediate settlement of the foundation shown in Figure (1). The undrained elastic modulus varies with depth, as shown in the figure, and v₁ = = 0.45. [Answer = 26 mm]. LETETEI 2L = 12 m -8 m -4m +3m+5m 5000 kN Į Layer 1 Layer 2 6 m 2B = 10 m 4 m 4 m 8m Figure (1) 4000 kPa 8000 kPa Eu 10,000 kPa 30,000 kPaarrow_forward
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- The initial principal stresses at a certain depth in a clay soil are 200 kPa on the horizontal plane and 100 kPa on the vertical plane. Construction of a surface foundation induces additional stresses consisting of a vertical stress of 45 kPa, a lateral (horizontal) stress of 20 kPa, and a counterclockwise (with respect to the horizontal plane) shear stress of 40 kPa. Plot Mohr's circle (1) for the initial state of the soil and (2) after construction of the foundation. Determine (a) the change in magnitude of the principal stress, (b) the change in maximum shear stress, and (c) the change in orientation of the principal stress plane resulting from the construction of the foundation.arrow_forwardThe initial principal stresses at a certain depth in a clay soil are 100 kPa on the horizontal plane and 50 kPa on the vertical plane. Construction of a surface foundation induces additional stresses consisting of a vertical stress of 45 kPa, a lateral stress of 20 kPa, and a counterclockwise (with respect to the horizontal plane) shear stressof 40 kPa. Determine the change shearing stress in kPa.arrow_forwardIn the figure, the rectangular foundation is loaded with a uniform load of 225 kPa. Accordingly, calculate the vertical stress increase 10 m below point A.arrow_forward
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