13-7 A long strip footing 1.25 m wide is used to sup- port the perimeter masonry bearing walls for a warehouse building. The soil underlying the building area is a clay where the undrained shear strength is 40 kPa (use zero for the angle of in- ternal friction), and the soil unit weight is 16 kN/m³. The rigidity index for the clay is 9. The foundation is constructed 1 m below the ground surface, and the soil backfill is well compacted. Applying the extended bearing capacity equation with a factor of safety of 3, calculate the maxi- mum load to be carried by the foundation, per meter of length.

Please round to the nearest One (i.e., 1). No Comma! The results of a plate-load test in a clay soil are shown below. The size of the plate is 0.58m x 0.58m. If a square column foundation (3m x 3m) that should carry a load of 3600KN, what is the estimated settlement of the foundation? Load/unit area Settlement (KN/m²) Load/unit area (kN/m³) (mm) 200 400 600 800 200 6. 300 400 13 10 500 20 20 600 29 30 40 50 60 70 Answer = mm Settlement (mm)

2. A 2m X 2m footing carrying 1400KN load is constructed in a site with 2.5m thick clay layer under a 2.5m thick sand layer. If the footing and the ground water table are located at 1.5m below the surface, calculate the consolidation settlement of the footing. You may assume the following soil properties: for sand sat 15.7kN/m°, and for clay eo= 0.65, Cc = 0.25, Cs = 0.06, O'p = 200kN/m² and sat =19.25KN/m³. 19.25kN/m and t = %3D

The initial principal stresses at a certain depth in a clay soil are 100 kPa on the horizontal plane and 50 kPa on the vertical plane. Construction of a surface foundation induces additional stresses consisting of a vertical stress of 45 kPa, a lateral stress of 20 kPa, and a counterclockwise (with respect to the horizontal plane) shear stressof 40 kPa. Determine the change in orientation of the principal plane resulting from the construction of foundation. CHOICES ( WITH COMPLETE SOLUTION): a. principal stress plane rotates 23 degree counterclockwise from horizontal plane b. principal stress plane rotates 46 degree clockwise from horizontal plane c. principal stress plane rotates 23 degree clockwise from horizontal plane d. principal stress plane rotates 46 degree counterclockwise from horizontal plane

A 2 m wide strip footing is to be placed as shown in figure below, Vertical stress at point A is kN/m² 1m 2m 2 100 kN/m -2m- A