Concept explainers
Redo Problem 16.4 using the modified general ultimate bearing capacity Eq. (16.31).
16.1 A continuous footing is shown in Figure 16.17. Using Terzaghi’s bearing capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: γ = 19 kN/m3, c′ = 31kN/m2,
Figure 16.17
16.4 Redo Problem 16.1 with the following: γ = 16.5 kN/m3, cu = 41 kN/m3,
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Chapter 16 Solutions
MindTap Engineering for Das/Sobhan's Principles of Geotechnical Engineering, 9th Edition, [Instant Access], 2 terms (12 months)
- 7. [Soil Bearing Capacity] ( a gross load of 700 kN. Using a factor of safety 3, determine the required value of B. Assume general shear failure. N. = 63.53,Nq = 47.16, N, = 54.36 A square footing is shown below. The footing will carry Q = 700 kN Y = 17.4 kN/m $ = 36° C = 0 1.2 m Barrow_forward2. A spread footing of 1.2 x 1.8 m (B = 1.2 m, L = 1.8 m) is loaded with a resultant force at its center, inclined at 20° to the vertical in the plane perpendicular to the footing length. Calculate the bearing capacity of this footing in MN. Use Prandtl/Reissner/Hansen bearing capacity factors. 20° P Y = 16.0 kN/m' c' = 0 d' = 32° D 1.5 m 1.20 m y = 19.0 kN/m Y = 20.0 kN/m' c' = 0 kPa d' = 340 1.00 marrow_forwardA footing 2.50 m x 2.50 m is located at a depth of 1.5 m in sand. The shear strength parameters to be used in design are c' = 0 and o' = 38°. What is the net ultimate bearing capacity of footing if the water table is at 3 m below foundation level? The unit weight of sand is 18 kN/m3 and FOS = 3 For O' = 38°, N, = 67 and Ng = 49arrow_forward
- 6. [Soil Bearing Capacity] ( Assume the general shear failure and use a factor of safety 2.8. Determine the follow N. = 25.13 , N, = 12.72, N,y = 8.34 a. The gross allowable bearing capacity. b. Net Allowable bearing capacity c. The safe load that the footing can carry. ). A circular footing 3 m in diameter is shown below. %3D Ground surface Y = 18.5 kN/m² C = 80 kPa 0 = 25° 1.1 m Dr = 1.8 m Water table Tse = 19.2 kN/m? Diameter = 3 marrow_forward7. [Soil Bearing Capacity] a gross load of 700 kN. Using a factor of safety 3, determine the required value of B. Assume general shear failure. N. = 63. 53 , Ng = 47.16, N, = 54.36 »). A square footing is shown below. The footing will carry %3D Q = 700 kN y = 17.4 kN/m 0 = 36° C = 0 1.2 m Barrow_forward2. A continuous footing is shown in the figure. Use the Terzaghi's bearing capacity equation with the given values: y = 155 pcf, c = 615 psf, p = 28°, Df= 1.8 ft, B = 2.3 ft, and F.S. = 3 qu = CNc + yDiNg + 0.50yBNy a. Determine the gross allowable load per unit area that the footing can carry, in kN/m². b. Determine the net allowable bearing capacity with bearing capacity with a factor of safety of 3, in psf then covert it to kPa. Determine the gross allowable bearing capacity with a factor of safety of 3 with respect to shear failure, in kPa. C.arrow_forward
- For general c- soil, cohesion c is 50 kPa, the total unit weight y. is 20 kN/m3 and the bearing capacity factors are N= 8 and = 3 and N, = 2. Using Terzaghi's formula. Na Calculate the net ultimate bearing capacity for a strip footing of width B=2m at depth z = 1 m. Considering shear failure only, estimate the safe total load on a footing 10m long by 2m wide strip footing using a factor of safety of 3. %3Darrow_forwardFor a certain soil, the cohesion is 50 kPa; the unit weight is 19.2 kN/m^3. Assuming local shear failure: (Nc = 7.5, Nq = 1.80, Ny = 0.48) for local shear failure (Nc = 9, Nq = 2.50, Ny = 1.20) for general shear failure. Calculate the net ultimate bearing capacity for a strip footing of width 1.25 m and depth of 4.5 marrow_forwardA strip footing was constructed on a pure sand which is 1.5 m wide with its base at a depth of 1 m. Using Terzaghi's method, the ultimate bearing capacity of strip footing will be [Take Y = 16 kN/m³, N., = 75, Assume general shear failure] Ya Yarrow_forward
- 1. A continuous footing is shown in Figure 16.19. Using Terzaghi's bearing capacity factors, determine the gross allowable load per unit area (4an) that the footing can carry. Assume general shear failure. Given: y = 115 lb/ft, c' = 600 lb/ft', d' = 25°, D, = 3.5 ft, B = 4 ft, and factor of safety = 3. qall Unit weight of soil = y Figure 16.19arrow_forwardA 1.2 m. wide wall footing was constructed on the surface of a silty sand soil. If the bottom of the footing is embedded to a depth of 0.75 m. from the ground surface, determine the percent increse of the bearing capacity. Unit weight of silty sand soil = 18.88 kN/m³ angle of friction 0 = 30° and is cohesionless. Bearing capacity factors: Nc = 37.16 Ng = 22.46 Ny = 19.13 wall footing or strip footing 1.2 m Ans. 146.76%arrow_forwardQ1. A square footing is located in a dense sand at a depth of 2.80 m. Determine the ultimate bearing capacity for the following water table positions. a. At ground surface b. At footing level c. At 1.5 m below the footing. Footung size=2.5m moist unit wight = 20.5Kn/m3 saturated unit weight=21.5Kn/m3 Nc=51.7 Nq=33.8 Ny(Gama)=36.5arrow_forward
- Principles of Geotechnical Engineering (MindTap C...Civil EngineeringISBN:9781305970939Author:Braja M. Das, Khaled SobhanPublisher:Cengage LearningPrinciples of Foundation Engineering (MindTap Cou...Civil EngineeringISBN:9781337705028Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage Learning
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