For a sand drain project (Figure 5.20), the following are given:

Clay: Normally consolidated

H_c = 5.5 m sone{way drainaged

C_c = 0.3

e_o = 0.76

c_v = 0.015 m²/day

Effective overburden pressure at the middle of clay layer = 80 kN/m²

Sand drain: r_w = 0.07 m

r_w = r_s

d_e = 2.5 m

c_v = c_vr

A surcharge is applied as shown in Figure P5.13. Calculate the degree of consolidation and the consolidation settlement 50 days after the beginning of the surcharge application.

Figure 5.20

Figure P5.13.

Transcribed Image Text:

Surcharge Groundwater table Sand Vertical drainage Sand drain Sand drain radius = rw Radial drainage He Radial drainage Clay layer Vertical drainage Sand (a) Section Sand drain radius = rw de (b) Plan