1. The figure below shows a square foundation which applies a load of 63 kN/m2 at...

1. The figure below shows a square foundation which applies a load of 63 kN/m2 at the ground surface. The soil profile consists of 3 clay layers where the coefficient of volume compressibility for the clay falls linearly from 0.05 m2/MN at the ground surface to 0.025 m2/MN at the bottom of layer 3. The stress change distribution with depth due to the foundation load is shown in the table.

Depth (m)	Stress change (kN/m2)
0	63
4*	46.94
8	30.87
12*	21.11
16	11.34
20*	8.35
24	5.48

a) Calculate the total consolidation settlement at the centre of the foundation above?

b) A similar foundation was constructed on a different site where 7m of sand overlies 7m of clay over a bed of impervious rock. The coefficient of consolidation for the clay is 0.7 m2/year and the coefficient of volume compressibility 0.05 m2/MN. In Oedometer tests on a 19 mm thick sample of clay from the site, 90% consolidation was reached at 76 minutes. How long would it take the clay to reach the same degree of consolidation on site?

c) Calculate the permeability of the clay in part (b).

Expert Solution

Ally Wells answered 1 year ago

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