Figure P9.32 shows a 20 m thick layer of normally consolidated clay (t = 18.6 kN/m3) that

Figure P9.32 shows a 20 m thick layer of normally consolidated clay (γt = 18.6 kN/m3) that is one-dimensionally loaded by Δσv = 50 kPa. The clay layer is below a 3 m thick layer of granular fill (γt = 19.6 kN/m3), and a dense, compacted glacial till underlies the clay. The water table is located at the top of the clay layer. A 1-D consolidation test is performed on a 2.20 cm thick, doubly drained specimen from the middle of the clay layer. When the stress conditions from the field (including the Δσv = 50 kPa) are applied to this specimen, it takes 1 minute for 50% average consolidation to occur.
(a) From the lab test data, determine cv for the soil.
(b) Compute effective stress at 18 m depth 4 years after the Δσv is applied to the clay layer.
(c) Compute the average degree of consolidation 4 years after Δσv application.
(d) If the settlement after 4 years is 22 cm, what is the estimated Cce for the clay?