Surcharge per unit area Surcharge per unit area Ao'p, + Aon Time -Time te (a) (b) Figure 16.22 Nature of application of surcharge dp- Smeared zone Clay He Sand drain Fre- Figure 16.21 Schematic diagram of a sand drain
Surcharge per unit area Surcharge per unit area Ao'p, + Aon Time -Time te (a) (b) Figure 16.22 Nature of application of surcharge dp- Smeared zone Clay He Sand drain Fre- Figure 16.21 Schematic diagram of a sand drain
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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Question
The diagram of a sand drain is shown in Figures 16.21 and 16.22. Given: rw = 0.25 m, rs = 0.35 m, de = 4.5 m, Cv = Cvr = 0.3 m2/month, kh/ks = 2, and Hc = 9 m.
Determine:
a. The degree of consolidation for the clay layer caused only by the sand drains after six months of surcharge application
b. The degree of consolidation for the clay layer that is caused by the combination of vertical drainage (drained on top and bottom) and radial drainage after six months of the application of surcharge. Assume that the surcharge is applied instantaneously.
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