A soft to very soft silty clay layer 3 m thick exists between a layer of permeable clayey silty sand at top and a nearly impermeable layer of stiff silty clay at bottom. Oedometer tests were carried...

Extracted text: A soft to very soft silty clay layer 3 m thick exists between a layer of permeable clayey silty sand at top and a nearly impermeable layer of stiff silty clay at bottom. Oedometer tests were carried out on a sample of the soft clay 19 mn thick. From the plot of AH versus log time, the value of time fj00 (the time at 100% primary consolidation) wa 100 min. From the graph of e versus log o' the compression index C, was 0.32 and the void ratio e, at the end of the primary consolidation was 0.72. Estimate the secondary compression of the silty clay layer that would occur from time of completion of the primary consolidation to 30 years of the load application in the field.