Concept explainers
Redo Problem 16.3 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
16.3 Redo Problem 16.1 with the following: γ = 115 lb/ft3, c′ = 1100 lb/ft2,
Want to see the full answer?
Check out a sample textbook solutionChapter 16 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
- A continuous footing is shown in Figure 16.17. Using Terzaghi’s bearing capacity factors, determine the gross allowable load per unit area (all ) that the footing can carry. Assume general shear failure. Given: γ = 19 kN/m3, c′ = 31kN/m2 , , Df = 1.5 m, B = 2 m, and factor of safety = 3.5.arrow_forwardA clayey soil has an unconfined bearing capacity factor of 48 kN/m2 and an angle of internal friction of 25o. Calculate (1) Terzaghi’s bearing capacity factor Nq, (2) Terzaghi’s bearing capacity factor Nc, and (3) Terzaghi’s bearing capacity factor Nγ using the following formula below.arrow_forwardThe 2.5 m x 3.5 m rectangular spread footing placed at a depth of 1.5 m supports a vertical load of 4000 kN and a moment of 400 KN-m, as shown in Figure 2. Determine the factor of safety, against bearing capacity failure, using Meyerhof’s effective area method.arrow_forward
- Redo Problem 16.1 with the following: = 16.5 kN/m3, cu = 41 kN/m3, =0, Df = 1.5 m, and factor of safety = 5. 16.1 A continuous footing is shown in Figure 16.17. Using Terzaghis bearing capacity factors, determine the gross allowable load per unit area (qall) that the footing can carry. Assume general shear failure. Given: = 19 kN/m3, c = 31kN/m2, =28, Df = 1.5 m, B = 2 m, and factor of safety = 3.5. Figure 16.17arrow_forwardIf the water table in Problem 16.9 drops down to 0.25 m below the foundation level, what would be the change in the factor of safety for the same gross allowable load? 16.9 A square footing is shown in Figure 16.18. Determine the gross allowable load, Qall, that the footing can carry. Use Terzaghis equation for general shear failure (Fs = 4). Given: = 17 kN/m3, sat = 19.2 kN/m3, c = 32 kN/m3, =26, Df = 1 m, h = 0.5 m, and B = 1.5 m. Figure 16.18arrow_forwardA braced cut is carried out to 10 m depth at a site where the soil consists of 4 m of sand ( = 17.0 kN/m3, = 33) at the top underlain by 6 m of clay ( = 18.5 kN/m3, c = 35 kN/m2). a. What would be the average value of cohesion and the unit weight for the equivalent homogeneous soil profile? b. Show the lateral earth pressure envelope you would use in determining the strut loads.arrow_forward
- It is required to design a cantilever retaining wall to retain a 5.0 m high sandy backfill. The dimensions of the cantilever wall are shown in Figure 15.52 along with the soil properties. Check the stability with respect to sliding and overturning, based on the active earth pressures determined, usinga. Coulomb's earth pressure theory (δ' = 24°), andb. Rankine's earth pressure theory.The unit weight of concrete is 24 .0 kN/m3arrow_forwardA column is to be supported by a square footing, 2.00 m on a side, on a founding depth of 1.00 m into a cohesionless soil deposit. The unit weight of the soil is 16 kN/m³ and the angle of internal friction of 25 deg. Nq= 12.7 Ny= 8.34 Evaluate the contribution of the depth of embedment to the ultimate bearing capacity of the soil, in kPa. 2 Evaluate the contrbution of the footing dimension to the ultimate bearing capacity of the soil, in kPa. 3 Evaluate the concentric load, in kN, that the footing can safely support, using a factor of safety of 3.0 against bearing capacity failure.arrow_forwardUsing Meyerhof's General Bearing Capacity Equation, calculate the Net Allowable Bearing Capacity of the footing shown with the following data: For SOIL, Cohesion, c = 19 kPa The angle of internal friction =23 Unit weight of moist soil, y = 19 kN/m3 Unit weight of submerged soil, ysub= 11 kN/m3 For footing, X=4.2m Y=3.5m Df=3.2m Use a Factor of Safety of 3 The load is inclined at an angle with the vertical Beta, B = 33 degrees Note: As much as possible round off only on the final answer.arrow_forward
- 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 Terzaghis bearing capacity factors and assume general shear failure of soil. Given: = 17 kN/m3, c = 48 kN/m2, =31.arrow_forwardNote: Need detailed answer and explanation for d-h. [Question 1] A vertical retaining wall (with base slab to be determined in later questions) of 5.4 meter height supports a horizontal backfill of a normally consolidated sand with unit weight equal to 17.3 kN/m3. Assuming friction angle is 36 degrees and cohesion of soil is zero, a. Compute for the At Rest force per unit Length (in kN/m, i.e., assuning 1 meter width of analysis) rounded in 2 decimal digits. (Answer: 103.41) b. Compute for the Rankine Active force per unit Length (in kN/m, i.e., assuning 1 meter width of analysis) rounded in 2 decimal digits. (Answer: 63.05) c. Compute for the Rankine Passive force per unit Length (in kN/m, i.e., assuning 1 meter width of analysis) rounded in 2 decimal digits. (Answer: 971.1) d. Estimate a constant dimension, d (from bottom to top of the stem) of the above given problem for the Rankine Active Pressure. Assume cover of 50mm. Express answer in millimeter (mm) rounded to the nearest…arrow_forwardFor an eccentrically loaded continuous foundation on sand, given B = 1.8 m, Df = 0.9 m, e/B = 0.12 (one-way eccentricity), γ = 16 kN/m3, and Φ' = 35°. Using the reduction factor method [Eq. (4.60)], estimate the ultimate load per unit length of the foundation.arrow_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 LearningFundamentals of Geotechnical Engineering (MindTap...Civil EngineeringISBN:9781305635180Author:Braja M. Das, Nagaratnam SivakuganPublisher:Cengage Learning