For sandy-gravel soil, the load-bearing value used in design calculations is what value in PSF?

• A. 2,000 PSF
• B. 3,000 PSF
• C. 4,000 PSF
• D. 5,000 PSF

Answer: (B)

The load-bearing value of sandy-gravel soil typically reflects its ability to support structural loads without experiencing excessive settlement or failure. In geotechnical engineering, sandy-gravel soil is known for its relatively high shear strength and good drainage characteristics, making it suitable for many types of construction.

The value of 3,000 PSF is commonly accepted for sandy-gravel soil in design calculations. This figure is rooted in empirical data and testing that classify the bearing capacities of various soil types. It indicates that sandy-gravel can safely support a load of 3,000 pounds per square foot without risking structural integrity or safety.

Using this recognized value allows engineers and architects to appropriately design foundations, ensuring stability and safety for structures built on such soil. Other values, such as 2,000 PSF, 4,000 PSF, and 5,000 PSF, may represent capacities for different soil types or conditions that do not apply directly to standard sandy-gravel scenarios, thereby reinforcing the validity of the 3,000 PSF figure as the typical design value.