At a planned construction site, a 2-m-thick buried clay layer lies beneath a surficial stratum of free-draining granular soil. Free-draining granular soil also underlies the clay layer. Double drainage from the clay layer can therefore occur when construction loads cause consolidation. The coefficient of consolidation for the clay is 0.001 m2/day. Settlement calculations indicate that the clay layer will eventually compress 4 cm (primary compression or consolidation) due to the effect of building loads.(a) How long a time period is required for 90 percent of the estimated settlement to occur?(b) How much settlement occurs in the first 12 months?(c) What time period is required for a settlement of 2 cm?
At a planned construction site, a 2-m-thick buried clay layer lies beneath a surficial stratum of free-draining granular soil. Free-draining granular soil also underlies the clay layer. Double drainage from the clay layer can therefore occur when construction loads cause consolidation. The coefficient of consolidation for the clay is 0.001 m2/day. Settlement calculations indicate that the clay layer will eventually compress 4 cm (primary compression or consolidation) due to the effect of building loads.
(a) How long a time period is required for 90 percent of the estimated settlement to occur?
(b) How much settlement occurs in the first 12 months?
(c) What time period is required for a settlement of 2 cm?
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