PRINCIPLES OF GEOTECH.ENGINEERING >LL+M
9th Edition
ISBN: 9781337583879
Author: Das
Publisher: CENGAGE L
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Chapter 16, Problem 16.13P
A square footing (B × B) must carry a gross allowable load of 1160 kN. The base of the footing is to be located at a depth of 2 m below the ground surface. If the required factor of safety is 4.5, determine the size of the footing. Use Terzaghi’s bearing capacity factors and assume general shear failure of soil. Given: γ = 17 kN/m3, c′ = 48 kN/m2,
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A 1.5m diameter footing is to be constructed 1.22m below the ground surface. The subsoil consists of a uniform deposit of dense soil having angle of internal friction=25deg, unconfined compressive strength=96KPa, unit wt of soil= 20.12kPa.
a. Compute the gross allowable bearing capacity using terzaghi's equation with factor of safety of 3.Nc=24.1, Nq=13.1, Ny=9.1.
b. Compute the ultimate bearing capacity using terzaghi's equation.Nc=24.1, Nq=13.1, Ny=9.1.
c. Compute the total allowable load including footing,column,weight of soil surcharge that the footing can carry using terzaghi's equation with factor of safety of 3. Nc=24.1, Nq=13.1, Ny=9.1.
A square footing which carries an axial load of 13000 kg has its bottom resting on a ground water table at a depth of 2.5 m from the ground surface. Nc = 35, Nq = 22, Nγ = 19. Take PDRY = 1910 kg/m3 and PSAT = 1600 kg/m3, c = 1800 kg/m2.a. Compute the required width of the footing using a factor of safety of 2.b. Compute the ultimate bearing capacity of the soil.c. Compute the net factor of safety.
A square footing having a dimension of 2.5m x 2.5m is supported by a cohesionless soil with the following properties:
ϕ = 32∘
γ = 18 kN/m3
γsat = 20 kN/m3
The bottom of the footing is 1.5m below the ground surface. Use FS = 3 and γw = 9.81 kN/m3. Apply the general bearing capacity equation. GWT is at the bottom of the footing and load is applied at an eccentricity of 250mm along one side.
1. Determine the effective short dimension, B' (in m).
2. Determine the effective long dimension, L' (in m).
3. Determine the ultimate bearing capacity (in kPa).
4. Determine the magnitude of the gross allowable load applied eccentrically (in kN).
Chapter 16 Solutions
PRINCIPLES OF GEOTECH.ENGINEERING >LL+M
Ch. 16 - A continuous footing is shown in Figure 16.17....Ch. 16 - Refer to Problem 16.1. If a square footing with...Ch. 16 - Redo Problem 16.1 with the following: = 115...Ch. 16 - Redo Problem 16.1 with the following: = 16.5...Ch. 16 - Redo Problem 16.1 using the modified general...Ch. 16 - Redo Problem 16.2 using the modified general...Ch. 16 - Redo Problem 16.3 using the modified general...Ch. 16 - Redo Problem 16.4 using the modified general...Ch. 16 - Prob. 16.9PCh. 16 - If the water table in Problem 16.9 drops down to...
Ch. 16 - Prob. 16.11PCh. 16 - A square footing is subjected to an inclined load...Ch. 16 - A square footing (B B) must carry a gross...Ch. 16 - Redo Problem 16.13 with the following data: gross...Ch. 16 - Refer to Problem 16.13. Design the size of the...Ch. 16 - Prob. 16.16PCh. 16 - Prob. 16.17PCh. 16 - Refer to the footing in Problem 16.16. Determine...Ch. 16 - Figure 16.21 shows a continuous foundation with a...Ch. 16 - The following table shows the boring log at a site...
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- ). A circular footing 3 m in diameter is shown below. 6. [Soil Bearing Capacity] (* Assume the general shear failure and use a factor of safety 2.8. Determine the follow N. = 25. 13 , Nq = 12.72, N, = 8.34 a. The gross allowable bearing capacity. b. Net Allowable bearing capacity c. The safe load that the footing can carry. Ground surface Y= 18.5 kN/m? C = 80 kPa = 25° 1.1 m D,- 1.8 m Water table Ye = 19.2 kN/m? Diameter = 3marrow_forwardA rectangular footing (base = 1.76 m., length = 5.83 m.) has its bottom 3.06 m. below the ground surface. Unit weight of soil is 19.07 kn/m3, unconfined compressive strength = 156 kPa. Use angle of internal friction = 10° (Nc = 9, Nq = 2.5, = 1.2). Compute the allowable load that the footing could carry. Use FS = 2.8. Round off to the nearest whole number.arrow_forwardA footing 2.25 x 2.25 m is located at a depth of 1.5 m in a sand, the shear strength parameters to be used in design being c' = 0 and ϕ' = 38˚. Determine the ultimate bearing capacity: (a) if the water table is well below foundation level and (b) if the water table is at the surface. The unit weight of the sand above the water table is 18 kN/m^3; the saturated unit weight is 20 kN/m^3. Note: Use the equations to solve for Nc, Nq and Nγ.arrow_forward
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