Question

Soil borings for the subsurface investigation of a site indicate a deep deposit of sandy soils. At one boring location, the blow count logged for a standard penetration test at a depth of 25 ft was 22 blows. The sand has a unit weight of 115 lbs/ft3. Using criteria that relate SPT results and the soil angle of internal friction, estimate the value of internal friction Ф for the sand at the test depth.

Answer 1