Q4 (40 marks). Two identical rigid foundations are given. Calculate the differential settlement ratio (8/L) after 100 days and long term after construction of the foundations. Hint: Average total final settlement of a rigid footing due to a clay layer can be found based on the following equation: S = 0.75 m, H Ao Foundation A 1.5 m x 1.5 m 0.8 m P = 600 KN P = 600 KN 15 m Foundation B 1.5 m x 1.5 m 0.8 m 3.5 m Sand + = 18 kN/m, E=20 MPa, v = 0,3 Clay Ysat 19 kN/m 3, 3 m m = 0.2 m/MN, c = 10-7 m/s Highly permeable bedrock Not to Scale 2 m 4.5 m