For the same dam and the same soil conditions as in Problem 3, a 4-meter-long vertical sheet pile is added at the left end of the dam base: (a) Draw the flow net by using Nf= 3 and Na=6.5. (b) Compute the flow rate q under the dam. (c) Compute the water pressures at the heel (A) and toe (B) sections of the base of the dam based on the drawn flow net. Answer: (b) q = 0.401 cm³/s/cm 20.0 m z (m) 17.0 12.0 10.0 8.0 4.0 Sandy soil k=0.0035 cm/sec Impervious Layer

For the same dam and the same soil conditions as in Problem 3, a 4-meter-long vertical sheet pile is added at the left end of the dam base: (a) Draw the flow net by using Nf= 3 and Na=6.5. (b) Compute the flow rate q under the dam. (c) Compute the water pressures at the heel (A) and toe (B) sections of the base of the dam based on the drawn flow net. Answer: (b) q = 0.401 cm³/s/cm 20.0 m z (m) 17.0 12.0 10.0 8.0 4.0 Sandy soil k=0.0035 cm/sec Impervious Layer

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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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.
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29. Seepage takes place beneath a concrete dam shown below resting on a fine, sandy silty soil having a permeability of 5 X 10-4 cm/s and a saturated unit weight of 19 KN/m3. A sheet pile is also provided at the upstream end of the dam in an attempt to reduce the seepage. Determine the quantity of seepage in m3/day per meter width, the safety factor with respect to piping, and the uplift thrust on the dam. 25 m 6m 1.75 m. 3.5 m 20 m 10 Impervicus stratum Fig 29 - Prob 29
answer in complete solution
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6.12 For the same dam and the same soil conditions as in Problem 6.11, a 4-meter-long vertical sheet pile is added at the left end of the dam base: (a) Draw the flow net by using N, = 3. (b) Compute the flow rate q under the dam. (c) Compute the water pressures at the heel (A) and toe (B) sections of the base of the dam based on the drawn flow net. 20.0 m z (m) 17.0 12.0 10.0 8.0 4.0 Sandy soil k=0.0035 cm/sec
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1. The figure shows a flownet for steady seepage between the ground surface and an excavation which has been braced by two sheet piles of unequal length. Estimate (a) the total flow rate into the excavation (b) the maximum exit gradient. Indicate on the figure where the maximum exit gradient will occur. (c) the water pressure at the tip of each pile (Ans: a) Q = 3 × 10-6 m³/s/m; b) ie = 0.34; c) PL = 85.0 kPa, PR = 150.4 kPa) dimensions in metres k=10-6 m/s 10 V I 3 15 A 20
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