Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Chapter 3, Problem 3.14QPP
A soil has
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A cohesive soil with an angle of shearing resistance of 28.08°has cohesion of 32.14 Kpa. The shear stress at failure is 64 Kpaa) Compute the normal stressb) Calculate the confining pressurec) Calculate the maximum principal stress
A soil element is loaded from state A to B. The stress values for the two states are A(p'=50 kPa, q=20 kPa), and B(p'=280 kPa, q=120 kPa). The bulk modulus of the soil is 1000 kPa, and its shear modulus is 1300 kPa. Work out the volumetric strain increment from the loading.
A granular soil is subjected to a minor principal stress of 200 kN/m2. If the angle of internal friction is 30°, determine the inclination of the plane of failure with respect to the direction of the major principal stress.
a.60
b.37.5
c.45
d.30
e.50
Chapter 3 Solutions
Foundation Design: Principles and Practices (3rd Edition)
Ch. 3 - Explain the difference between moisture content...Ch. 3 - A certain saturated sand has a moisture content...Ch. 3 - Consider a soil that is being placed as a fill and...Ch. 3 - A sample of soil has a volume of and a weight of...Ch. 3 - A site is underlain by a soil that has a unit...Ch. 3 - The sub-surface profile at a certain site is shown...Ch. 3 - A vertical load of 300 kN is applied to a area at...Ch. 3 - A vertical load of 20 k is applied to a area at...Ch. 3 - 3m3m footing is to be built on the surface of a 15...Ch. 3 - A 3 ft square footing carries a sustained load of...
Ch. 3 - A 2m thick fill is to be placed on the soil shown...Ch. 3 - Estimate the effective friction angle of the...Ch. 3 - Explain the difference between the drained...Ch. 3 - A soil has c=5 kPa and =32. The effective stress...Ch. 3 - A footing with an embedment of 2 m is embedded in...Ch. 3 - Prob. 3.16QPPCh. 3 - Prob. 3.17QPPCh. 3 - A 9 ft thick fill is to be placed on the soil...
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- The soil profile at a site consists of 10 m of gravelly sand underlain by a soft clay layer. The water table lies 1 m below the ground level. The moist and saturated unit weights of the gravelly sand are 17.0 kN/m3 and 20.0 kN/m3, respectively. Due to some ongoing construction work, it is proposed to lower the water table to 3 m below the ground level. What will be the change in the effective stress on top of the soft clay layer?arrow_forwardA soil has c′ = 5 kPa and f′ = 32°. The effective stress at a point in the soil is 125 kPa. Com-pute the shear strength normal to this stress at this point.arrow_forwardA granular soil is subjected to a minor principal stress of 200 kN/m2. If the angle of internal friction is 30°, determine the inclination of the plane of failure with respect to the direction of the major principal stress. Show free body diagram. a.30 b.45 c.60 d.37.5arrow_forward
- Mohr Circle - At a point in the ground, a soil experiences a vertical effective stress of 3000 psf and a horizontal effective stress of 1000 psf. The shear stress on the horizontal plane is 100 psf. If the effective stress friction angle is ϕ'=36 degrees, is the soil at a state of failure?arrow_forwardAt one point in a soil mass, the minor principal stress is 1,000 psf. What is themaximum value possible for the major principal stress at this point if the shear stress cannot exceed 2,000 psf?arrow_forwardThe total normal stress in a saturated soil mass is 295 kN / m2 , gap water pressure is 120 kN / m2 shear in terms of effective stresses in a plane measured as Calculate its strength. Effective tensile strength parameters for soil c '= 14 kN / m2 and φ'=28 degree.arrow_forward
- A maximum shear strength of a loose soil is 57.7 kPa at a normal effective stress of 100 kPa. The critical state friction angle (degrees) isarrow_forwardA clay formation having a depth of 4 m. underlies a sand formation having a depth of 3 m. The dry unit weight of sand is 16.5 kN/m3 and the saturated unit weights of clay and sand are 20.4 kN/m3 and 19.6 kN/m3 respectively. The groundwater table is at the interface of the sand and clay. Compute the effective stress at the bottom of clay. Use 3 decimal places in MPa.arrow_forwardA rectangular footing (4.89 x 4.38 m.) is placed 1.21 m. below the ground surface. The soil arrangement is composed of sand (ground) for the first 6.52 meters and followed by clay for the next 6.98 meters. The force acting on the footing is 10,293 kN. Determine the resulting stress increase at the midheight of the consolidating layer in kPa. Assume a 2V:1H pressure diagram. Unit weight of sand = 16.1 kN/m3. Unit weight of clay = 18.7 kN/m3. Use stored value. Answer in five decimal places.arrow_forward
- A clay formation having a depth of 4 m. underlies a sand formation having a depth of 3 m. The dry unit weight of sand is 16.5 kN/m3 and the saturated unit weights of clay and sand are 20.4 kN/m3 and 19.6 kN/m3 respectively. The groundwater table is at the interface of the sand and clay. Compute the effective stress in kPa at the bottom of the clay if water rises 2 m. above the ground surface.arrow_forwardA rectangular footing (4.14 x 4.43 m) is placed 1.38 m below the ground surface. The soil arrangement is composed of sand (ground) for the first 6.29 m and followed by clay for the next 5.94 m. The force acting on the footing is 10581 kN. Determine the resulting stress increase at the midheight of the consolidating layer in kPa. Assume 2V:1H pressure diagram. Unit weight of sand = 16.8 kn/m3. Unit weight of clay = 18.4 kn/m3arrow_forwardA flexible circular area is subjected to a uniformly distributed load of 150 kN/m2 (Figure 6.2). The diameter of the load area is 2 m. Determine the stress increase in a soil mass at points located 3 m below the loaded area at r = 0, 0.4 m, 0.8 m, and 1 m. Use Boussinesq’s solution.arrow_forward
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