A soft clay layer, mv = 2.5 x 10-4 m2/kN; cv = 0.187m2/month, is 9.2 m thick and overlies impervious shale. An embankment, to be constructed in six months, will subject the centre of the layer to a pressure increase of 100 kN/m2. It is expected that a roadway will be placed on top of the embankment one year after the start of construction and maximum allowable settlement after this is to be 25 mm.

Determine a suitable sand drain system to achieve the requirements.


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