An oil tank is to be sited on a soft alluvial deposit of clay. Below the soft clay is a thick layer of stiff clay. It was decided that a circular embankment, 10 m diameter, with wick drains inserted into the soft clay would be constructed to preconsolidate it. The height of the embankment is 6 m and the unit weight of the soil comprising the embankment is 18 kN/m3. The following data are available: thickness of soft clay = 7 m, ks = 1 × 10−10 m/s and Ch = 0.6 m2/yr. The desired degree of consolidation is 90% in 12 months. Determine the spacing of a square grid of the wick drains. Assume wick drain of size 100 mm × 3 mm and qw = 0.1 × 10−6 m3/s. The flow point distance is 4 m. Assume a half-closed system.
An oil tank is to be sited on a soft alluvial deposit of clay. Below the soft clay is a
thick layer of stiff clay. It was decided that a circular embankment, 10 m diameter,
with wick drains inserted into the soft clay would be constructed to preconsolidate
it. The height of the embankment is 6 m and the unit weight of the soil comprising
the embankment is 18 kN/m3. The following data are available: thickness of soft
clay = 7 m, ks = 1 × 10−10 m/s and Ch = 0.6 m2/yr. The desired degree of
consolidation is 90% in 12 months. Determine the spacing of a square grid of the
wick drains. Assume wick drain of size 100 mm × 3 mm and qw = 0.1 × 10−6 m3/s.
The flow point distance is 4 m. Assume a half-closed system.
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