Principles of Foundation Engineering (MindTap Course List)
9th Edition
ISBN: 9781337705028
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 6, Problem 6.16P
A tall cylindrical silo carrying flour is to be supported by a 1.5 m wide ring beam that can be designed as a continuous foundation. The inner and outer diameters of the ring are 10 m and 13 m, respectively. The soil at the site is entirely sand (ф′ = 35°, γ = 19 kN/m3) and the ring beam is placed on the ground with Df = 0. Determine the maximum silo load that can be carried by the ring beam, assuming that the entire load is transferred to the ground through the ring beam.
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Chapter 6 Solutions
Principles of Foundation Engineering (MindTap Course List)
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 3 m thick clay layer (cu = 50 kN/m2 and γ = 19.0 kN/m3) is underlain by a weaker clay (cu = 30 kN/m2 and γ = 18.0 kN/m3) to a large depth. A 2.0 m wide square foundation is placed at 1.8 m depth below the ground level. Determine the maximum column load that can be allowed on the foundation with FS = 3.arrow_forwardA square column foundation has to carry a gross allowable load of 1805 kN (FS = 3). Given: Df = 1.5 m, = 15.9 kN/m3, =34, and c = 0. Use Terzaghis equation to determine the size of the foundation (B). The applied load on a shallow square foundation makes an angle of 15 with the vertical. Given: B = 1.83 m, Df = 0.91 m, = 18.08 kN/m3, =25, and c = 23.96 kN/m2. Use FS = 4 and determine the gross allowable (vertical component) load. Use Eq. (16.9).arrow_forwardThe excavation 3 × 6 m for a foundation is to be made to a depth of 2.5 m below ground level in a soil of bulkunit weight = 20 kN/m3.What effect this excavation will have on the vertical pressure at a depth of 6 m measuredfrom the ground surface vertically below the centre of foundation? The influence factor for m = 0.43 and n = 0.86 is 0.10.arrow_forward
- A column foundation 1.2 ×1.6 m placed at a depth of 1.2 m. The column of 0.4 × 0.4 m is subjected to a moment in direction of least dimension of the base of 165 kN- m and to vertical load of 950 kN. The soil has a unit weight of 16.8 kN/m3, saturated unit weight of 18.8 kN/m3, cohesion of 10 kN/m2 and a friction angle of 26o. the water table located at a depth of 2.0 m. Check the stability of the foundation against B.C failure. Show all the necessary labeled sketches.arrow_forwardA load of 425 kN/m is carried on a strip footing 2m wide at a depth of1m in a stiff clay of saturated unit weight 21kN/m3 , the water table being at ground level. Determine the factor of safety with respect to shear failure: (a) when c u = 105 kN/m2 and Φu= 0 (b) when c=10 kN/m2 and Φ= 28 degreearrow_forwardConsider a continuous foundation of width B = 1.4 m on a sand deposit with c' = 0, Φ' = 38° and γ = 17.5 kN/m3. The foundation is subjected to an eccentrically inclined load (see Figure 4.31). Given: load eccentricity e = 0.15 m, Df = 1 m, and load inclination β = 18°. Estimate the failure load Qu(ei) per unit length of the foundation a. for a partially compensated type of loading [Eq. (4.85)] b. for a reinforced type of loading [Eq. (4.86)]arrow_forward
- Calculate the settlement due to volume distortion in a clay where a rectangular-shape (flexible category) foundation 6 ft by 12 ft imposes a total loading of 220 kips. The layer of saturated clay (cohesion c is 1,500 psf) extends 12 ft deep and is underlain by rock.arrow_forwardA circular foundation 12 ft in diameter imposes a pressure of 8,000 psf onto the soil. At the 12-ft depth, determine the vertical stress increase beneath the center and the edge of the loaded area, assuming:(a) the Westergaard conditions apply.(b) the 60° approximation.arrow_forwardIt 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_forward
- A square foundation is 1.5m x 1.5m in plan. The soil supporting the foundation has a friction angle '=20 and c'=15.2 kN/m². The unit weight of soil is y=17.8 kN/m². Determine the allowable gross load on the foundation with a factor of safety F,=4. Assume that the depth of the foundation D=1m and the general shear failure occur in the soils mass.arrow_forwardConsider a continuous foundation of width B = 1.4 m on a sand deposit with c = 0, = 38, and = 17.5 kN/m3. The foundation is subjected to an eccentrically inclined load (see Figure 6.33). Given: load eccentricity e = 0.15 m, Df = 1 m, and load inclination = 18. Estimate the failure load Qu(ei) per unit length of the foundation a. for a partially compensated type of loading [Eq. (6.89)] b. for a reinforced type of loading [Eq. (6.90)]arrow_forwardA 2.0 m wide strip foundation is placed in sand at 1.0 m depth. The properties of the sand are: γ = 19.5 kN/m3, c′ = 0, and ф′ = 34°. Determine the maximum wall load that the foundation can carry, with a factor of safety of 3.0, using Terzaghi’s original bearing capacity equation with his bearing capacity factors, and Meyerhof’s general bearing capacity equation with shape, depth, and inclination factors from Table 6.3.arrow_forward
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