A soil bearing capacity test shows 2,500 psf. What is the maximum allowable bearing pressure that should be used for foundation design?
Correct Answer
B) 833 psf
The allowable bearing pressure is typically the ultimate bearing capacity divided by a safety factor of 3. Therefore, 2,500 psf ÷ 3 = 833 psf is the safe design value.
Why This Is the Correct Answer
The allowable bearing pressure for foundation design must include a safety factor to account for uncertainties in soil conditions, construction variations, and loading conditions. The standard practice in geotechnical engineering is to divide the ultimate bearing capacity by a safety factor of 3 to determine the allowable bearing pressure. This ensures adequate safety margin for the foundation design. Therefore, 2,500 psf ÷ 3 = 833 psf is the correct allowable bearing pressure.
Why the Other Options Are Wrong
Option C: 2,500 psf
A value of 2,000 psf would represent a safety factor of only 1.25 (2,500 ÷ 2,000), which is far below the required safety factor of 3 for soil bearing capacity.
Option D: 2,000 psf
A value of 1,250 psf represents a safety factor of only 2 (2,500 ÷ 1,250), which is still below the standard required safety factor of 3 for foundation design.
Memory Technique
Remember 'Safety Factor of 3' - think 'Soil Strength Split in Three' to recall that you divide ultimate bearing capacity by 3 for safe design values.
Reference Hint
Look up 'Foundation Design' or 'Soil Bearing Capacity' in the Florida Building Code, Chapter 18 (Soils and Foundations) or geotechnical engineering references.
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