Answered: Surcharge per unit area Surcharge per…

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

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: r_w = 0.25 m, r_s = 0.35 m, d_e = 4.5 m, C_v = C_vr = 0.3 m²/month, k_h/k_s = 2, and H_c = 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.

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

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