What is the maximum allowable bearing capacity for sandy clay soil according to typical Florida soil conditions?
Correct Answer
D) 3,000 psf
Sandy clay soil typically has a bearing capacity of approximately 3,000 psf in Florida conditions. This is higher than pure clay but lower than well-compacted sand or rock.
Why This Is the Correct Answer
Sandy clay soil in Florida typically has a maximum allowable bearing capacity of 3,000 psf. This soil type combines the cohesive properties of clay with the granular characteristics of sand, resulting in moderate bearing strength. The 3,000 psf value represents standard engineering practice for this soil classification in Florida's geological conditions, providing adequate safety factors for typical residential and light commercial construction while accounting for the soil's mixed composition and drainage characteristics.
Why the Other Options Are Wrong
Option B: 1,500 psf
2,000 psf underestimates the bearing capacity of sandy clay soil. While this might be appropriate for some clay soils with limited sand content, sandy clay typically performs better due to the granular sand particles providing additional structural support and improved drainage characteristics within the soil matrix.
Option C: 4,000 psf
4,000 psf overestimates the bearing capacity for sandy clay soil. This higher value would be more appropriate for well-compacted sand, dense gravel, or other high-strength soils. Sandy clay, while stronger than pure clay, still contains enough clay content to limit its bearing capacity below this level.
Memory Technique
Remember 'Sandy Clay = 3K' - the sand content boosts clay from 2,000 to 3,000 psf, but clay content keeps it below pure sand's 4,000+ psf capacity.
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