A 3 m tall, 30 m wide, road embankment made of rockfill with a unit weight...

A 3 m tall, 30 m wide, road embankment made of rockfill with a unit weight of 20 kN/m3 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 cv=7 m^2/month, and a unit weight of γsat=18.5 kN/m3. The compression characteristics of the clay are mr=120, and m=12.

a) Determine the time required for the remaining consolidation to be 25 mm or less (allowing completion of the road surface) (hint what is U?).

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?

Expert Solution

The construction ojf embankment cause change in effective stress in clay layer and which results in 1 degree consolidation of clay layer. The time required for consolidation can be obtained by time factor formula. The surcharge over the road can be calculated by keeping time factor same and obtaining new cofficient of consolidation.

Ally Wells answered 1 year ago

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