Refer to Figure 7.28. For the construction of an airport, a large fill operation is required. For the work, the average permanent load, (p), on the clay layer will increase by about 70 kN/m2 . The average effective overburden pressure on the clay layer before the fill operation is 95 kN/m2 . For the clay layer, which is normally consolidated and drained at top and bottom, H = 5 m, Cc = 0.24, e0 = 0.81, and cv = 0.44 m2/mo. a. Determine the primary consolidation settlement of the clay layer caused by the additional permanent load, (p). b. What is the time required for 90% of primary consolidation settlement under the additional permanent load only? c. What temporary surcharge, (f), will be required to eliminate the entire primary consolidation settlement in 6 months by the precompression technique?
Refer to Figure 7.28. For the construction of an airport, a large fill operation
is required. For the work, the average permanent load, (p), on the clay
layer will increase by about 70 kN/m2
. The average effective overburden
pressure on the clay layer before the fill operation is 95 kN/m2
. For the clay
layer, which is normally consolidated and drained at top and bottom, H = 5 m, Cc = 0.24, e0 = 0.81, and cv = 0.44 m2/mo.
a. Determine the primary consolidation settlement of the clay layer caused
by the additional permanent load, (p).
b. What is the time required for 90% of primary consolidation settlement
under the additional permanent load only?
c. What temporary surcharge, (f), will be required to eliminate the entire
primary consolidation settlement in 6 months by the precompression
technique?
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