Principles of Geotechnical Engineering (MindTap Course List)
Principles of Geotechnical Engineering (MindTap Course List)
9th Edition
ISBN: 9781305970939
Author: Braja M. Das, Khaled Sobhan
Publisher: Cengage Learning
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Chapter 8, Problem 8.7P

(a)

To determine

Find the seepage in the permeable layer in m3/day/m for x=1m.

(b)

To determine

Find the seepage in the permeable layer in m3/day/m for x=2m.

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Solve 8.C.1
Consider the hydraulic structure shown in the figure below. In the flow net for flow through the permeable layer, the number of flow channels is Nf = 5 and the number of potential drops is Ng = 12 Calculate the seepage loss. 25 m 10 m 1.67 m 3.34 m 20 m k = 0.002 cm/sec 1.67 m 1.67 m Permeable layer | Impermeable layer Select the correct response: 7.21 m3/day/m O 2.17 m/day/m 6.28 m3/day/m O 6.82 m/day/m 11
Water flows at the rate of 4 x 10-2 cm³/s through a cylindrical sand sample with a diameter of 10 cm and a coefficient of permeability of 8 x 10-4 cm/s. In Case I, the flow is in upward direction, as shown in Figure 3a. In Case II, the flow is in downward direction, as shown in Figure 3b. For each case: a). The total head loss through the sand. b). The total stress, the effective stress and the PWP at points A, B and C if the soil has a saturated unit weight of 19 kN/m³. a). Case I 9 cm 12 cm 12 cm ▼ C B A D = 10 cm 9 cm 12 cm 12 cm b). Case II Figure 3. Seepage through soil ▼ с B A ? D = 10 cm
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