What type of soil typically has the highest bearing capacity for foundation design?
Correct Answer
D) Bedrock
Bedrock has the highest bearing capacity, often exceeding 10,000 psf. It provides the most stable foundation support compared to other soil types which have much lower bearing capacities.
Why This Is the Correct Answer
Bedrock has the highest bearing capacity because it is solid, consolidated rock that has been formed over geological time periods through intense pressure and heat. Unlike soil materials, bedrock does not compress significantly under load and provides exceptional structural stability. Typical bearing capacities for bedrock range from 10,000 to 100,000+ psf, far exceeding any soil type. This makes bedrock the ideal foundation material when accessible at reasonable depths.
Why the Other Options Are Wrong
Option B: Clay
While sand has good bearing capacity (2,000-6,000 psf) due to good drainage and particle interlocking, it still cannot match the superior strength and stability of solid bedrock.
Option C: Sand
Silt has very low bearing capacity (500-2,000 psf) because of its extremely fine particles and poor drainage characteristics, making it highly compressible and unsuitable for heavy loads.
Memory Technique
Use 'BSCR' - Bedrock Strongest, Clay Compressible, Silt Squishy, Rock Rules. Bedrock is literally 'rock solid' - the phrase exists for a reason!
Reference Hint
Florida Building Code, Chapter 18 (Soils and Foundations) or geotechnical engineering sections covering allowable bearing pressures
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