House is located in South Florida. Performed SPTs showed no sign of sinkhole activity. No expansive clays, just fine sand and limestone at 50-60 feet. BUT : interior floor in certain area is buckled (maximum difference in floor elevation about 4 inches) , ceramic tiles are broken and popped up...
Dear colleges! Here is the situation: due to lack of space we had to use small SPT rig with weight of hammer = 70 lbs., drop=15 in., same size spoon as for a standard rig. Theoretically the energy for smaller hammer is 4 times less, so to convert its N-values to standard ones, just divide it by...
