Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN: 9781305635180
Author: Braja M. Das, Nagaratnam Sivakugan
Publisher: Cengage Learning
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Chapter 16, Problem 16.2P
A 2.0 m wide continuous foundation carries a wall load of 350 kN/m in a clayey soil where γ = 19.0 kN/m3, c′ = 5 kN/m2 and
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A 2.0m wide continuous foundation carries a wall load of 350 kN/m in a clayey soil where y 19,0 kN/m', c'= 5 kN/m2 and '= 23°. The foun- dation depth is 1.5 m. Determine the factor of safety of this foundation.
Given: A square foundation (4.5m x 4.5m) is founded at
2.4m in a soil with the following properties: y = 17.6
kN/m³ c'= 32.0 kN/m² and q' = 28°
Find: Using a factor of safety of 2.5 against bearing
capacity failure and assuming a constant unit weight of
the soil, determine the safe bearing capacity (q, in kN/m²)
when:
a) The water table is level with the foundation base
b) Percentage reduction in bearing capacity when the water table rises to 0.5m below
G.L.
A 2 m wide continuous foundation is placed at 1 m depth within a 1.5 m thick sand layer that is underlain by a weaker clay layer. The soil properties are as follows: Upper sand layer: unit weight = 18.0 kN/m2, d' = 38° Lower clay layer: unit weight = 19.0 kN/m, undrained shear strength = 25 kN/m2 Determine the maximum wall load that can be allowed on the foundation with FS = 3.
Chapter 16 Solutions
Fundamentals of Geotechnical Engineering (MindTap Course List)
Ch. 16 - Prob. 16.1PCh. 16 - A 2.0 m wide continuous foundation carries a wall...Ch. 16 - Determine the maximum column load that can be...Ch. 16 - A 2.0 m wide strip foundation is placed in sand at...Ch. 16 - A square column foundation has to carry a gross...Ch. 16 - The applied load on a shallow square foundation...Ch. 16 - A column foundation (Figure 16.23) is 3 m 2 m in...Ch. 16 - Prob. 16.8PCh. 16 - A 2 m 3 m spread foundation placed at a depth of...Ch. 16 - An eccentrically loaded foundation is shown in...
Ch. 16 - For an eccentrically loaded continuous foundation...Ch. 16 - The shallow foundation shown in Figure 16.12...Ch. 16 - A mat foundation measuring 14 m 9 m has to be...Ch. 16 - Repeat Problem 16.13 with the following: Mat...Ch. 16 - Prob. 16.15PCh. 16 - For the mat in Problem 16.15, what will be the...Ch. 16 - Prob. 16.17CTPCh. 16 - Prob. 16.18CTPCh. 16 - A 2.0 m 2.0 m square pad footing will be placed...
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- The applied load on a shallow square foundation makes an angle of 15° with the vertical. Given: B= 1.83 m, D;= 0.91 m, 7 = 18.08 kN/m³, ' = 25°, and d' = 23.96 kN/m?. Use FS= 4 and determine the gross allowable (vertical component) load. Use Eq. (16.9).arrow_forwardA 2.0 m wide strip foundation is placed in sand at 1.0 m depth. The properties of the sand are: y = 19.5 kN/m³, c' = 0, and o' = 34°. Determine the maximum wall load that the foundation can carry, with a factor of safety of 3.0, using a. Terzaghi's original bearing capacity equation with his bearing capacity factors, and b. Meyerhof's general bearing capacity equation with shape, depth, and inclination factors from Table 6.3. 6.8 %3Darrow_forwardA continuous foundation is required in a soil where c' = 10 kN/m², o' = 26°, and y = 19.0 kN/m³. The depth of the footing will be 1.0 m. The dead load and the live load are 600 kN/m and 400 kN/m, respectively. Determine the required width for the foundation based on allowable stress design with FS = 3, using Eq. (6.10) and Table 6.1. %3D thearrow_forward
- A rectangular foundation of size (L = 3 m, w =2 m) at a depth (D, =1.5 m) is subjected to vertical pressure (q. = 400 kN/m²) and supported by silty sand soil having H, = 0.32, E, = 10000 kN/m², k-575 kN/m²/m. A rock layer is located at a depth of 7m. The thickness of the foundation (t = 0.4 m) and the modulus of elasticity of concrete (E₁) equal to 20 x106 kN/m². Estimate the elastic settlement of the foundation. 1/1arrow_forwardA 2.0m wide continuous foundation carries a wall load of 350 kN/m in a clayey soil where y 19,0 kN/m', c'= 5 kN/m2 and '= 23°. The foundation depth is 1.5 m. Determine the factor of safety of this foundation. The landfill volume required for dry solid waste generated by a food factory per year is 300 m3. After drying the wet solid waste from the factory X% of it is recycled, followed by 2.5X% diversion for composting and 400 m3 for incineration, before the remainder is sent to the landfill. Using the information given below:Density of dry solid waste = 460 kg/m3Daily generation of wet solid waste = 2200 kgMoisture content of the wet solid waste = 32%(ii) Determine X% and estimate the dimensions of the landfill site if the length: width : depth = 6:5:4arrow_forwardA 2.0 m wide continuous foundation is placed at 1.5 m depth in a saturated clay where cu = 40 kN/m2 and γ = 17 kN/m3. At 2.0 m below the ground level, this clay layer is underlain by a stiffer clay where cu = 60 kN/m2 and γ = 18 kN/m3. What would be the maximum wall load allowed with FS = 4?arrow_forward
- A 2.0 m wide continuous foundation carries a wall load of 350 kN/m in a clayey soil where y = 19.0 kN/m², c' = 5.0 kN/m², and o'= 23°. The foundation depth is 1.5 m. Determine the factor of safety of this foundation using Eq. (6.28). 6.6 %3D %3Darrow_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_forwardA 2.0 m wide square foundation is placed at 0.5 m depth ina saturated clay where cu= 40 kN/m2 and delta=19.0 kN/m3 .There is a very stiff stratum present at 1.0 m below the foundation. Determine the ultimate bearing capacity using Buisman’s (1940) equation.arrow_forward
- a 2.0m wide continuous foundation is placed at 1.5m depth in a saturated clay layer where Cu=40kn/m2 and gamma=18.5 kn/m3. At 2m below ground level, clay underlain by another stiffer clay layer, where Cu=60 and gamma=19. Whats the max wall load allowed if FS=3arrow_forwardA 1.5 m x 2.0 m rectangular foundation is placed at 1.0 m depth in sand where angle (prime) phi = 40 and gamma = 18.5 kN/m3. Bedrock is present at 1.0 m below the foundation. Using Eq. (7.3), determine the ultimate bearing capacity of the foundation.arrow_forwardA continuous foundation with a width of 1 m is located on a slope made of clay soil. Refer to Figure 5.19 and let Df = 1 m, H = 4 m, b = 2 m, γ = 16.8 kN/m3, c = cu = 68 kN/m2, Φ= 0, and β = 60°.a. Determine the allowable bearing capacity of the foundation. Let FS = 3.b. Plot a graph of the ultimate bearing capacity qu if b is changed from 0 to 6 m.arrow_forward
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