Question

Assume you are given a 6 foot by 24-foot footing that overlies a thick deposit of predominantly sandy material. A generalized soil profile for the site is illustrated below. The net bearing pressure beneath this footing is 2000 pounds per square foot (psf. Construct a vertical strain influence diagram and estimate the how much the footing will settle 2000 psf Load Clay (CL), y- 115 pcf qo-ave-20 tsf 3 feet 3 feet Sand (SW), y-125 pcf o-ave- 60 tsf Sand (SP), γ 120 pcf o-ave- 150 tsf 5 feet Gravelly Sand (SP), γ o-ave-205 tsf 128 pcf 25 feet

Answer 1

"So. So = 0. A6 times 1.4 times [2000 - (3 times 115)] times 6.545 times 10^-6 = 0.0135 ft foundation width (B) = 6 fT length (L) = 24 fT Bearing pressure beneth the foundation (a) = 2000p Depth as max in lessence factor z_1 = [0.5 + 0.0555(L/B^-1] times B = [0.5 + 0.0555(24/6 - 1] times 6 = 4.f_1 Depth of zero influence factor z_2 = [2 + 0.222(L/B^-1] times B = [2 + 0.222(24/6^-1)] times 6 = 16 ft maximum starin influence factor Iz