The diagram of a sand drain is shown in Figures 5.21 and 5.22. 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.

Figure 5.21

Figure 5.22

Transcribed Image Text:

Smeared zone Clay H. Sand drain -re