Foundation Design: Principles and Practices (3rd Edition)
Foundation Design: Principles and Practices (3rd Edition)
3rd Edition
ISBN: 9780133411898
Author: Donald P. Coduto, William A. Kitch, Man-chu Ronald Yeung
Publisher: PEARSON
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Chapter 7, Problem 7.7QPP

A 1.5 m wide, 2.5 m long, 0.5 m deep spread footing is underlain by a soil - c ' = 10 kPa, ϕ '=32°, and γ = 18.8 kN/m 3 . The groundwater table is at a great depth. Using ASD compute the maximum unfactored load this footing can support while maintaining a factor of safety of 2.5 against a bearing capacity failure.

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A 1.4-m wide, 2.5-m long, 0.5-m deep spread footing is underlain by a soil with c' = 10.0 kPa, ' = 35.0°, y = 18.4 kN/m³. The groundwater table is at a great depth. Using ASD compute the maximum unfactored load this footing can support while maintaining a factor of safety of 2.5 against a bearing capacity failure. Solution: 1. Determination of the method: According to the given information, the best suitable method would be 2. Determination of bearing capacity factors - function of ': a. Nc = b. Nq = c. Ny 3. Determination of other bearing capacity factors: 3.1 Shape factors: a. Sc = = b. Sq c. Sy = 3.2 Depth factors: k = a. de b. dq || = c. dy = 3.3 Inclination factors: All inclination factors = 3.4 Surcharge stress at depth D: a. O'D 4. Using the proper method to estimate the capacity and load: kPa; = a. qult = kPa; b. Ultimate load the footing can support is Pult = c. Maximum unfactored load this footing can support is Pa kN; kN; ◆ mehod.
A continuous footing installed at a depth of 3 feet with base of 4 feet wide is constructed on cohesionless soil with a unit weight of 125 lb/ft³ and an angle of internal friction of 31°. The factor of safety requirement for the design is 2. The water table is sufficiently below the base of the foundation that won't interfere with the design. Determine: 1. Allowable bearing capacity (qa) 2. Allowable wall load in lb/ft. Plb B
i) A strip footing of width B=1m is embedded 0.6m in soil. The soil has unit weight equal to 19kN/m3 and a critical-state friction angle Øc of 32o . Assume water table to be deep, what is the ultimate bearing capacity of the soil? ii) A square footing is to be constructed on a deep deposit of sand at a depth of 0.9 m to carry a design load of 300 kN with a factor of safety of 2.5. The ground water table may rise to the ground level during rainy season. Design the plan dimension of footing given γsat = 20.8 kN/m3 , Nc = 25, Nq = 34 and Nγ =32.

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Foundation Design: Principles and Practices (3rd Edition)

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