The foundations supporting two columns of a building are shown in Figure E9.16. An extensive so investigation was not carried out, and it was assumed in the design of the foundations that the clay lay had a uniform thickness of 1.2 m. Two years after construction the building settled, with a differenti settlement of 10 mm. Walls of the building began to crack. The doors have not jammed, but b measuring the out-of-vertical distance of the doors, it is estimated that they would become jammed the differential settlement exceeded 24 mm. A subsequent soil investigation showed that the thicknes of the clay layer was not uniform but varies, as shown in Figure E9.16. The owners would like to g an estimate of the expected total differential settlement and how long it will take before the doo. become jammed.

A circular footing with a radius of r = 4.0 ft will be embedded D = 2 ft in uniform clay. The top of the foundation is at the surface. The water table is at the ground surface. An intact sample of the clay with Gs=2.75 was obtained using a thin-walled Shelby tube from a depth of 10 ft below the ground surface. The sample was saturated and has a gravimetric water content of 45 %. Estimate its void ratio e0 and total unit weight y _in pcf. Ovp' = 800psf Void Ratio 1.5 1.4 1.3 1.2 1.1 1.0 0.9 0.8 do 10 0.1 0 2 z/r, depth in radii 6 7 8 9 Cr = 0.07 100 1000 Effective Stress (psf) 0.2 0.3 0.4 0.6 0.81.0 7.0 10.0 Cc = 0.3 8.0 9.0 5.0 6.0 I, stress in percent of surface contact pressure 2 3456 8.10 10000 3.0 2.5 (2.0) 1.25 20 30 40 50 60 80 100 1.0 PAG 0.75 Note: Numbers on curves indicate offset distances in radii, x/r. 2r Z 0.5 0₂- KAB X 0.25 IX q 100 0, 10 FIGURE 4.10 Chart for calculating the increase in vertical stress beneath a uniformly loaded circular area. (From NAVFAC DM-7.1, 1982,…

This is for foundation engineering review. Please show work and choose from the answer choices

Not site specific I am checking calculations