Use the Schmertmann method to estimate the settlement of a foundation bearing on a sand deposit and where the following conditions apply: • Square foundation, 4.5 ft by 4.5 ft, installed at a depth of...

Use the Schmertmann method to estimate the settlement of a foundation bearing on a sand deposit and where the following conditions apply:

• Square foundation, 4.5 ft by 4.5 ft, installed at a depth of 3 ft

• Foundation bearing pressure, q = 4 ksf = 2 tsf

• Soil unit weight, above water table

Use the tabulation procedure as shown in Illustration 1. Analyze for conditions extending to a depth 2B below foundation level, using three sublayers each 3 ft thick. Standard penetration test (SPT) values for the three layers are N_avg
= 36  27, and 32. Assume E_X
= 9N and C₂
= 1 The groundwater table is at the elevation of the base of the foundation (use submerged unit weight for soil zone below foundation level when computing σ_vp).