Principles Of Foundation Engineering 9e
9th Edition
ISBN: 9781337705035
Author: Das, Braja M.
Publisher: Cengage,
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Chapter 6, Problem 6.17P
A 2.0 m × 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c′ = 0, ф′ = 26°, γ = 19 kN/m3, and cu = 60 kN/m2. Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.
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A 2.0 m x 2.0 m square pad footing will be placed in a normally consolidated clay soil to carry a column load Q. The depth of the footing is 1.0 m. The soil parameters are: c’= 0, ϕ’= 26º, γ =19kN/m3 , and cu = 60 kN/m2. Determine the maximum possible value for Q, considering short-term and long-term stability of the footing.
A circular footing with a 1.5 m diameter is to be
constructed 1.22 m
below the ground surface. The subsoil consists of
a uniform deposit
of dense soil having the following strength
parameters:
Angle of Friction = 250 Nc = 24.1 Nq = 13.1 Ny = 9.1
Cohesion = 48 kN/m2
Unit weight of soil = 20.12 kN/m2
The groundwater table is at a great depth and its
effect can be
ignored.
Determine the following:
a) Ultimate bearing Capacity of the soil
A circular footing with a 1.5 m diameter is to be constructed 1.2 m below the ground surface. Thesubsoil consists of a uniform deposit of dense soil having the following strength parameters.Angle of internal friction = 25o, Nc = 24.1 ; Nq =13.1 ; N = 9.1Unconfined compressive strength = 96 kN/m2Unit weight of soil = 20.12 kN/m3The ground water table is at great depth and its effect can be ignored.a) Compute the Ultimate bearing capacity of the soil.b) Compute the gross allowable bearing capacity of the soil using a factor of safety of 3.c) Compute the allowable load the footing could carry
Chapter 6 Solutions
Principles Of Foundation Engineering 9e
Ch. 6 - For the following cases, determine the allowable...Ch. 6 - A 5.0 ft wide square footing is placed at 3.0 ft...Ch. 6 - Prob. 6.3PCh. 6 - Redo Problem 6.2 using the general bearing...Ch. 6 - The applied load on a shallow square foundation...Ch. 6 - A 2.0 m wide continuous foundation carries a wall...Ch. 6 - Determine the maximum column load that can be...Ch. 6 - A 2.0 m wide strip foundation is placed in sand at...Ch. 6 - A column foundation (Figure P6.9) is 3 m × 2 m in...Ch. 6 - For the design of a shallow foundation, given the...
Ch. 6 - An eccentrically loaded foundation is shown in...Ch. 6 - Prob. 6.12PCh. 6 - For an eccentrically loaded continuous foundation...Ch. 6 - A 2 m 3 m spread footing placed at a depth of 2 m...Ch. 6 - Prob. 6.15PCh. 6 - A tall cylindrical silo carrying flour is to be...Ch. 6 - A 2.0 m 2.0 m square pad footing will be placed...Ch. 6 - An eccentrically loaded continuous foundation is...Ch. 6 - A square foundation is shown in Figure P6.19. Use...Ch. 6 - The shallow foundation shown in Figure 6.25...Ch. 6 - Consider a continuous foundation of width B = 1.4...
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- A square footing has dimensions 2 m x 2 m and founded at a depth of 2 m. Consider the following statements regarding capacity of footing in pure clay with an unconfined compressive strength of 0.15 N/mm?, o = 0° and y = 1.7 g/cm3. Assume Terzaghi's factors for o = 0 as Nc = 5.7; N. =1 and N., = 0. Choose the correct statement(s): A Net ultimate bearing capacity is 555.75 kN/m2. Correct Option Ultimate bearing capacity is 589.104 kN/m2. Correct Option C Net ultimate bearing capacity is 427.5 kN/m2. Ultimate bearing capacity is 460.85 kN/m2.arrow_forwardA circular footing having a diameter of 1.47m has its bottom at a depth of 2.54 m from the ground surface. The water table is located at a depth of 1.09m below the ground. FS = 2.86 Properties of soil are as follows: Specific gravity, GS = 2.72 Void ratio, e = 0.19 Cohesion, c=20.20 kPa, Assume local shear failure and Terzhagi's Bearing Capacity Equation. Use the following bearing capacity factors: Nc' = 11.85 Nq' = 3.88 Ny' = 1.12 Calculate the following Net Allowable load on the footing, kN HINT: Use Dry unit weight for soil above the groundwater table. Unit weight of water = 9.81 kN/m² NOTE: ROUND OFF ONLY ON THE FINAL ANSWERarrow_forwardCalculate the Safe bearing capacity per unit area of(i) a strip footing 1 m wide (ii) a square footing 3m x 3m (iii) a circular footing of 3m diameter. (iv) a rectangular footing of 1.3x 2.2 m. Unit weight of the soil 1.8 t/m3, cohesion = 2t/m2 And Ф = 200, Nc =17.5, Nq = 7.5 and N γ = 5. Depth of footing is 1.6m below ground surfacearrow_forward
- A rectangular footing 3m x 2m exerts a pressure of 100kN/m2on a cohesive soil Es= 5x104 kN/m2and µ = 0.5. Estimate the immediatesettlement at the centre, assuming(a) the footing is flexible (b) the footing is rigid (ii) Write about influence of water table in determination of bearing capacity.arrow_forwardA square footing having a dimension of 4m has its bottom at a depth of 3.2m Trom the ground surface. The water table is located at an insignificant depth. FS=3 Properties of wet soil are as follows: Specific gravity, Gs = 2.7 Void ratio, e = 0.35 Degree of saturation = 70% Cohesion, c = 19 kPa Angle of internal friction = 26 degrees Assume general shear failure. Calculate the following: 1. Gross Ultimate Bearing Capacity of the footing using Terzaghi's assumption, kPa. 2. Net Allowable Bearing Capacity of the footing using Terzaghi's assumption, kPa.arrow_forward1. A 3m x 3m square footing is constructed at a depth of 2m in a 26m deep clay layer with following soil properties: ] =16.5kN/m³, Normally Consolidated Clay, e̟= 0.65, Cc = 0.25,s=0.5 and Es= 6.0 MN/m2. If there is a 1000kN structural load on the footing, calculate the consolidation settlement of the footing.arrow_forward
- A square footing having a dimension of 4m has its bottom at a depth of 3.2m Trom the ground surface. The water table is located at an insignificant depth. FS=3 Properties of wet soil are as follows: Specific gravity, Gs = 2.7 Void ratio, e = 0.35 Degree of saturation = 70% Cohesion, c = 19 kPa Angle of internal friction = 26 degrees Assume general shear failure. Calculate the following: 1. Gross Ultimate Bearing Capacity of the footing using Terzaghi's assumption, kPa. 2. Net Allowable Bearing Capacity of the footing using Terzaghi's assumption, kPa. Capaarrow_forwardA circular footing is 3.73 m in diameter. The bottom of the footing is 2.68 m below the ground surface. Moist unit weight of soil is 18.36 kn/m3, saturated unit weight is 20.16 kn/m3. Cohesion of soil is 92 kpa. Use Nc = 25.26, Nq= 12.13, Ny= 8.23. If the groundwater table is located at a depth of 1.38 m from the ground surface determine the allowable bearing capacity that the footing can carry. FS = 2.arrow_forwardA rectangular footing of breadth size 3 m and length 5 m is designed on CLAY at a depth of 1.5 m below the ground level to support a vertical load of 1200 kN. The unit weight of the soil is 19 kN/m³ and shear strength parameters are cu 65 kN/m² and θ =0°. Calculate factor of safety and take the appropriate bearing capacity coefficient Nc, Nq, and Nr, as 5.7, 1.0 and 0 respectively.arrow_forward
- A square footing has a dimension of 1.2 m x 1.2 m and has itsbottom 1 m below the ground surface. The Dry and bulk density ofthe soil is 1846 kg/m3 and 1965 kg/m3 respectively. The cohesion of the soil is 1605 kg/m3 . The bearing capacity factors are Nc = 35, Nq = 22, Nγ = 19. a) If the ground water table is located at a depth of 1.2m below theground surface, compute the allowable LOAD that the footingcould carry if it has a factor of safety of 3b) Find the ultimate bearing capacity of the soil if the ground watertable is at the bottom of the footing.arrow_forwardUsing terzaghi Problem No. 2 A circular footing with 1.50m diameter is to be constructed 1.22m below the ground surface. The subsoil consists of a uniform deposit of dense soil having the following strength parameters. The ground water table is at great depth and its effect can be ignored. Angel of Internal Friction = 25.00⁰ Unconfined compressive strength = 96 kN/m3 Unit weight of Soil = 201.12 kN/m3 a) Compute the ultimate bearing capacity of the soil using vesic equation. uy compute the gross allowable bearing capacity of the soil using a factor of safety of 3.00 c) Compute the total allowable load that the footing can carry.arrow_forwardA circular footing with a 1.5 m diameter is to be constructed 1.22 mbelow the ground surface. The subsoil consists of a uniform depositof dense soil having the following strength parameters:Angle of Friction = 25o Nc = 24.1 Nq = 13.1 Ny = 9.1Cohesion = 48 kN/m2Unit weight of soil = 20.12 kN/m2The groundwater table is at a great depth and its effect can beignored.Determine the following:a) Ultimate bearing Capacity of the soilb) Compute the gross allowable bearing capacity of the soil using afactor of safety of 3.c) Compute the total allowable load that the footing can carry.arrow_forward
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