Raft Foundation Ssubjects Its Supporting Soil To Auniform Pressure Of 300kpa

A raft foundation subjects its supporting soil to a uniform pressure of 268kN/m2. The dimensions of the raft are 6.1 m by 15.25 m. Determine the vertical stress increments due to the raft at a depth of 4.58 m below it (i) at the centre of the raft and (ii) at the central points of the short edges.

A concentrated load of 85 kN acts on the horizontal surface of a soil. Plot the variation of vertical stress increments due to the load on horizontal planes at depths of 1 m, 2 m and 3 m directly beneath it.

Answer Fig. 4.15

1

85 kN

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