A square footing of dimension 1.5m x 1.5m carries a load of 890 kN as shown in the image: Determine the following: (d) primary settlement for normally consolidated clay using exact equation for additional pressure at midpoint of clay. (e) primary settlement for normally consolidated clay using approximate equation for additional pressure at midpoint of clay.

Example (11): (footing on clay) Determine the size of the square footing shown in figure below. If q,= 100 kPa and F.S.= 3.0? = 1000 kN G.S. Y soil 20 kN/m 2m Y conc. 24 kN/m² B = ? 0.4m

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,…

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