What is the maximum allowable bearing capacity for medium dense sand according to typical soil bearing values?
Correct Answer
A) 3,000 psf
Medium dense sand typically has an allowable bearing capacity of 2,000-3,000 psf, with 3,000 psf being the upper range. Dense sand can support up to 4,000 psf, while loose sand is limited to around 1,000-2,000 psf.
Why This Is the Correct Answer
Medium dense sand has an allowable bearing capacity range of 2,000-3,000 psf according to standard geotechnical engineering references. The question asks for the maximum allowable bearing capacity, which would be the upper limit of this range at 3,000 psf. This value represents the safe load-bearing capacity that medium dense sand can support without excessive settlement or failure.
Why the Other Options Are Wrong
Option B: 4,000 psf
4,000 psf is the bearing capacity for dense sand, which is a higher density classification than medium dense sand.
Option C: 1,000 psf
1,000 psf is too low for medium dense sand and represents the lower range for loose sand conditions, not medium dense sand.
Memory Technique
Use the mnemonic 'LMD 1-2-3-4': Loose (1-2k), Medium dense (2-3k), Dense (up to 4k) - each step increases by 1,000 psf increments.
Reference Hint
Look up soil bearing capacity tables in the Florida Building Code Chapter 18 (Soils and Foundations) or geotechnical engineering reference sections.
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