You have purchased some land and are ready to build the house of your dreams. A geotechnical study revealed that the soil is a homogeneous silty sand with: Unit weight = 110 pcf , c’= 400 psf, φ’ = 23o , cu=550psf. Ground water table was encountered at 15ft of depth. For parts “a”-”c”, consider long term conditions. a) (12pt) One of the columns is supported by a square footing of B=3ft, and Df = 4 ft; what is the allowable load for that column for a factor of safety of 3? b) (13pt) If the allowable load calculated in task 1 was applied with one-way eccentricity of 0.3 ft, what is the new factor of safety for that spread footing? c) (15pt) One of the walls will have a wall footing. If the length of the wall is 22 ft, and the wall is expected to carry a load of 15,000 lb/ft, design the footing (i.e. provide the width and depth for the wall footing). Explain your reasoning for the dimensions chosen. Note. It is common to have footings with depth ranging from 2ft to 3ft in averaged size houses. d) (10pt.) If your analysis for part “a” considers saturated, undrained conditions and groundwater table 5ft below ground surface, list 4 variables that change values in the new analysis and report the new values.

Principles of Foundation Engineering (MindTap Course List)

9th Edition

ISBN:9781337705028

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter3: Natural Soil Deposits And Subsoil Exploration

Section: Chapter Questions

Problem 3.19P

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You have purchased some land and are ready to build the house of your dreams. A geotechnical study revealed that the soil is a homogeneous silty sand with: Unit weight = 110 pcf , c’= 400 psf, φ’ = 23o , cu=550psf. Ground water table was encountered at 15ft of depth. For parts “a”-”c”, consider long term conditions. a) (12pt) One of the columns is supported by a square footing of B=3ft, and Df = 4 ft; what is the allowable load for that column for a factor of safety of 3? b) (13pt) If the allowable load calculated in task 1 was applied with one-way eccentricity of 0.3 ft, what is the new factor of safety for that spread footing? c) (15pt) One of the walls will have a wall footing. If the length of the wall is 22 ft, and the wall is expected to carry a load of 15,000 lb/ft, design the footing (i.e. provide the width and depth for the wall footing). Explain your reasoning for the dimensions chosen. Note. It is common to have footings with depth ranging from 2ft to 3ft in averaged size houses. d) (10pt.) If your analysis for part “a” considers saturated, undrained conditions and groundwater table 5ft below ground surface, list 4 variables that change values in the new analysis and report the new values.

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