Problem 3(a): As a consulting engineer, you have been given a project to design

Question

Problem 3(a): As a consulting engineer, you have been given a project to design a suitable foundation for a mall. List the considerations that will govern the choice of foundation. Problem 3(b): A spread footing supported on a sandy soil has been designed to support a certain column load with a factor of safety of 2.5 against bearing capacity failure. However, there is some uncertainty in both: the column load, P, and the friction angle, phi. Which one of the following would have the greatest impact on the actual factor of safety: An actual P that is twice the design value, or actual phi that is half the design value? Use bearing capacity computations with reasonably assumed values to demonstrate the reason of your response.

Explanation / Answer

? Choosing a kind of foundation depends on:
? the ground conditions
? the groundwater conditions
? the site, the environment (the buildings nearby)
? the structure of our building? When is it necessary?
? The load-bearing layer is in deeper location
? The loads of the building are too heavy
? Other special cases
? Types
? Piles
? Slurry wall
? Other 3(b)angle of friction will have a greater impact on the safety of factor........bearing cpacity ...q=net ultimate bearing capacity/factor of safety

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