Sheet pile k= 4 x 10-4 cm/sec Impermeable layer Figure 8.23 8.2 Draw a flow net for the single row of sheet piles driven into a permeable layer as shown in Figure 8.23. Given: • H₁ = 3 m D = 1.5 m • D₁ = 3.75 m • H₂=0.5 m Calculate the seepage loss per meter length of the sheet pile (at right angles to the cross section shown).

Flow Nets A single row of sheet piles is driven into a permeable layer as shown in the figure. Given: • Hị = 5.5 m • H2 = 4.4 m Calculate the seepage loss per meter length of the sheet pile (at right angles to the cross section shown). Bear in mind that in the flow net of the system the number of flow channels is Nf = 4 and the number of potential drops is Na = 8. + Sheet pile H H2 D k = 4 × 10-4 cm/sec Impermeable layer Round your final answer to three significant figures. ® m³/ day /m 1.

Q-4: The following figure shows the flow net for seepage of water around a single row of sheet piles driven into a permeable layer. Calculate how deep the sheet pile should be driven (h) to achieve factor of safety = 3 against downstream heave, given that ysat for the permeable layer = 18 kN/m3. (Note: Thickness of permeable layer T = 18 m) H₁ = 10 m (h) Heave zone Sheet pile ►||1| Impermeable layer H₂ = 2 m Ysat 18 kN/m³

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