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A 3 m tall, 30 m wide, road embankment made of rockfill with a unit weight of 20 kN/m' is to be constructed over a 30 m thick normally consolidated clay layer resting on a very permeable fracture rock bed. The clay layer has a coefficient of consolidation c=7 m/month, and a unit weight of Vsar=18.5 kN/m. The compression characteristics of the clay are m,=120, and m=12. a) Determine the time required for the remaining consolidation to be 25 mm or less (allowing p. 2 of 2 completion of the road surface) (hint what is ?). b) How high should the surcharge embankment be to achieve the same consolidation in 6 months (to the nearest 0.5 m)? c) What would the wick-drain spacing be to achieve the same results as in b) but with only half the surcharge height? A 3 m tall, 30 m wide, road embankment made of rockfill with a unit weight of 20 kN/m' is to be constructed over a 30 m thick normally consolidated clay layer resting on a very permeable fracture rock bed. The clay layer has a coefficient of consolidation c=7 m/month, and a unit weight of Vsar=18.5 kN/m. The compression characteristics of the clay are m,=120, and m=12. a) Determine the time required for the remaining consolidation to be 25 mm or less (allowing p. 2 of 2 completion of the road surface) (hint what is ?). b) How high should the surcharge embankment be to achieve the same consolidation in 6 months (to the nearest 0.5 m)? c) What would the wick-drain spacing be to achieve the same results as in b) but with only half the surcharge height

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