1. The time for 75% consolidation of a 25-mm clay specimen (drained at top and bottom) in the laboratory is 22 minutes. How long will it take for a 6-m thick clay layer in the field to undergo 55% consolidation under the same pressure increment? In the field, there is a rock layer at the bottom of the clay
1. The time for 75% consolidation of a 25-mm clay specimen (drained at top and bottom) in the
laboratory is 22 minutes. How long will it take for a 6-m thick clay layer in the field to undergo
55% consolidation under the same pressure increment? In the field, there is a rock layer at the
bottom of the clay
2. A foundation 6.1 by 12.2m (20 by 40 ft) in plan is to be constructed at a site where the
geological profile is as shown in Fig. 17.17. The foundation load is 287 kPa (3 tons/ft2) and the
unit weights of various soils are as shown in the diagram. Consolidation tests of the
compressible clay indicate that it has a void ratio of 1.680 at 95.8 kPa (1 ton/ft2) and a
compression index of 0.69. The coefficient of consolidation is 8.3x10-4 cm2/s. Calculate the total
settlement, and plot the rate of settlement at the center of the foundation, in millimeters
(inches) versus years.
3.
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