Fig. 3.17 shows a soil profile at a given site. Determine: (i) Average co-efficient of permeability of the deposit. (ii) Equivalent co-efficient of permeability of the deposit in the horizontal and vertical directions. Silty Sand (k= 3x10 tm/s) 8m 1m Clay (k 2-5 x 10 8 cm/s) Fine Sand 6 m (k = 8 x10-3cm/s 10 m Coarse Sand (k = 7-2 x 10-2cm /s Fig. 3.17

Fig. 3.17 shows a soil profile at a given site. Determine: (i) Average co-efficient of permeability of the deposit. (ii) Equivalent co-efficient of permeability of the deposit in the horizontal and vertical directions. Silty Sand (k= 3x10 tm/s) 8m 1m Clay (k 2-5 x 10 8 cm/s) Fine Sand 6 m (k = 8 x10-3cm/s 10 m Coarse Sand (k = 7-2 x 10-2cm /s Fig. 3.17

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter9: Consolidation

Section: Chapter Questions

Problem 9.4P

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A horizontal stratified soil deposit consists of three layers each uniform in itself. The permeabilities of these layers are 8 × 10^–4 cm/s, 52 × 10^–4 cm/s, and 6 × 10^–4 cm/s,and their thicknesses are 7, 3 and 10 m respectively. Find the effective average permeability in mm/s of the deposit in the horizontal direction. a. 15.9 x 10^-3 b. 8.9 x 10^-3 c. 7.7 x 10^-3 d. 13.6 x 10^-3
A layered soil is shown in the figure below. Given that H1 = 1 m, k1 = 10-4 cm/sec H2 = 1 m, k2 = 2.8 x 10-2 cm/sec H3 = 2 m, k3 = 3.5 x 10-5 cm/sec Estimate the ratio of equivalent permeability, kH(eq)/kV(eq).
A horizontal stratified soil deposit consists of three layers each uniform in itself. The permeabilities of these layers are 8 × 10–4 cm/s, 52 × 10–4 cm/s, and 6 × 10–4 cm/s, and their thickness are 7, 3 and 10 m respectively. Find the effective average permeability of the deposit in the horizontal and vertical direction (mm/s).
A horizontal stratified soil deposit consists of three layers each uniform in itself. The permeabilities of these layers are 8 × 10^–4 cm/s, 52 × 10^–4 cm/s, and 6 × 10^–4 cm/s,and their thicknesses are 7, 3 and 10 m respectively. Find the effective average permeability in mm/s of the deposit in the vertical direction. a.7.7 x 10^-3 b.8.9 x 10^-3 c.13.6 x 10^-3 d.15.9 x 10^-3
A pipe of 1.2 m diameter was provided in a reservoir to act as an outlet. Due to disuse, it was buried and completely clogged up for some length by sediment. Measurements indicated the presence of fine sand (K, 10 m/day) deposit for a length of 100 m, at the upstream end and of coarse sand (K, = 50 m/day) at the downstream end for a length of 50 m. In between these two layers the presence of silty sand (K3=0.10 m/day) for some length is identified. For a head difference of 20 m on either side of the clogged length the seepage discharge is found to be 0.8 m³/day. Estimate the length of the pipe filled up by silty sand.
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Refer to the figure. If H1 = 1.94 m, H2 = 2.37 m, h = 1.c m, e =0.49, Gs = 2.67,area of the tank = 0.64 m2, and hydraulic conductivity of the sand (k) = 0.3d cm/sec. What is the upward seepage force per unit volume of soil?
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