Tut2_Bearing_1 - CIVL3210 Geotechnical Engineering Tutorial...

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CIVL3210 Geotechnical Engineering Tutorial 2 – Bearing capacity of shallow footings CIVL3210 Geotechnical Engineering Tutorial 2 - Bearing capacity of shallow footings 1. Determine a suitable size for a square footing which is to carry a working load of 333 kN and is to be placed a depth of 1 m below the surface in a clay which has undrained shear strength of 120 kN/m 2 and a unit weight of 18 kN/m 3 . ANS: 1.0 m x 1.0 m 2 . A mass concrete pier of circular section is to carry a load, including its own weight, of 2500 kN. The base of the pier is to be located 4.5m below the surface of a deep layer of saturated clay. The average bulk unit weight of the clay is 18 kN/m 3 and it’s average undrained shear strength c u = 50 kN/m 2 . Choosing a suitable value for the bearing capacity factor N c , determine the diameter of the pier to give a factor of safety of three. Assume that a strength of 0.3c u can be mobilised on the cylindrical surface of the pier below ground level.
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