.A layer of saturated clay is 10 m thick, the lower boundary being impermeable; an embankment is to be constructed above the clay. Determine the time required for 90% consolidation of the clay layer. If 300 mm diameter sand drains at 4 m centres in a square pattern were installed in the clay, in what time would the same overall degree of consolidation be reached? The coefficients of consolidation in the vertical and horizontal directions, respectively, are 9.6 and 14.0 m^2 /year.

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter11: Ground Improvement
Section: Chapter Questions
Problem 11.9P
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4.A layer of saturated clay is 10 m thick, the lower boundary being impermeable;
an embankment is to be constructed above the clay. Determine the time required
for 90% consolidation of the clay layer. If 300 mm diameter sand drains at 4 m
centres in a square pattern were installed in the clay, in what time would the same
overall degree of consolidation be reached? The coefficients of consolidation in
the vertical and horizontal directions, respectively, are 9.6 and 14.0 m^2
/year.

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