3. The soil profile at a site consists of 2.5 m of sand (y 20 kN/m) over 3 m of soft clay (y = 15 kN/m, e, = 2.1, C, = 1.2, 0/0 = 1.5, C,/C, = 0.1, Ca/Cc = 0.04) over coarse sand. The ground water table is 2 m below the ground surface. Before construction of a structure at the site, a 3-m-thick fill (y = 20 kN/m?) is placed over a 10-hectare area. After the placement of the fill, the ground water table is expected to rise by 1.5 m. Compute settlement (a) resulting from the primary consolidation of the soft clay and (b) after 30 years assuming that primary consolidation is completed in 280 days. Ans. 14 cm; 21 cm