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 8.3P
To determine
Find the seepage loss in
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The section of a sheet pile is shown in
the figure. The coefficient of permeability
of the soil is k=8.5x10 m/s. Assume
that each stream has an area of its water
surface as 1hectare.
8 m
2 m
a. Determine the seepage (lit/sec) into
the downstream side per meter width of
the sheet pile.
b. Determine the difference in the head
(m) of water level after 3 days.
c. How long will it take in days before the
head difference = 5.10 m?
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.
Draw a flow net for the single row of sheet piles driven into a permeability layer as shown in Figure 8.18,
given the following:
H1 = 5 m,
H2 = 0.7 m,
D = 4 m
D1 = 10 m
Calculate the seepage loss per meter length of the sheet pile (at right angles to the cross section shown).
Sheet pile
H1
H2
D1
k = 4 × 10-4 cm/sec
Impermeable layer
土品1D→
Chapter 8 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- PROBLEM No. 5 The section of a sheet pile is shown in figure below. The coefficient of permeability of the soil is k = 4.2 x 103 m/s. Determine the seepage into the downstream side per meter length of the sheet pile.arrow_forwardThe sheet pile shown on the figure below is driven into a soil with a permeabilityk = 22 × 10-4 cm/s. Calculatea- the seepage loss per metre lengthb- the pore water pressure at the 12 points shown on the figure.arrow_forwardThe following figure shows a sheet pile wall for a temporary cut at a construction site. The soil has a permeability, k, of 10-7 m/s. 1 m 6 m 1 m 6 m 5 m -ĐATUM IMPERVIOUS ROCK LAYER A. Construct the flow net. Sketch the figure on your answer sheet then construct the flow net. B. Compute the amount of seepage, qt, in terms of m2/s. C. Estimate the pore water pressure at the bottom tip of the wall (point A). Assume water unit weight, yw, is 10 kN/m³. D. What are the assumptions for using a flownet in seepage analysis? Please list at least three.arrow_forward
- HOMEWORK P1: For a given sheet pile driven into a permeable soil layer underlain by an impermeable clay layer, (a) Draw the flow net by using Nf= 3. (b) Compute the flow rate q around the sheet pile. Sheet pile h=3.5 m 1.5 m H=5 m H=10 m Sandy soil k=0.0035 cm/sec Impervious Layer Answer: (b) q = 0.583 cm3/s/cmarrow_forwardDraw a flow net for the single row of sheet piles driven into a permeable layer as shown in Figure below Given: H₁ = 3 m H₂ = 0.5m calculate the seepage loss per meter length of the sheet pile (at right angles to the cross section shown). H₁ 3 D = 1.5 m D₁ = 3.75 m D₁ -Sheet pile k= 4 x 10-4cm/sec Impermeable layerarrow_forward1. Calculate the rate of flow or seepage flow per meter length of the sheet pile at right angle to the cross section shown .K =6.5 x 10-6 m/sec Sheet pile ws 4.3 m 5 m 0.7 m 4 m 10 m Impermeable layerarrow_forward
- Refer to Figure 18.26b. Let L = 15.24 m, fill = 17.29 kN/m3, sat(clay) = 19.49 kN/m3, clay = 20, Hf = 3.05 m, and D = 0.406 m. The water table coincides with the top of the clay layer. Determine the total downward drag on the pile. Assume that = 0.6 clay. FIG. 18.26 Negative skin frictionarrow_forward5.26 The section through sheet pile is shown in Figure, the coefficient of AVA permeability of the soil is 2.0 x 10- 6 m/s. Draw the flow net and determine the quantity of seepage. 3.00 m 3.00 m Ans.: N = 4.2, Na = 9, q = 4.7*10 m'/sec/m 3.50 m ameo 5.27 The dam shown in Figure is located on the anisotropic soil. The coefficients of permeability in the x and z directions are 5 107 and 1.8*10 m/s, respectively. Determine the quantity of seepage under the dam. Ans.: N = 3.25, Na = 12, q = 1.1*10* m/sec/m 15.00 m 1.00 m 3.00 m 8.00 m 33.00 m- 8.00 m Civil Eng Dept. - College of Eng Soil Mechanics Assistant Prof. Dr. Ahmed Al-Obaidi 411 9 立arrow_forward►||1 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 • H₂ = 0.5 m D₁ = 3.75 m Calculate the seepage loss per meter length of the sheet pile (at right angles to the cross section shown).arrow_forward
- Draw a flow net for a single row of sheet piles driven into a permeable layer as showin Figure Q3 (b) below. Thus, determine the seepage loss per meter length of thesheet pile.H1 = 9.6 m D = 5 mH2 = 3.7 m D1 = 13 marrow_forwardDraw a flow net for the single row of sheet piles driven into a permeable layer as shown in Figure below Given: H₁ = 3 m H₂ = 0.5m D=1.5m D₁ = 3.75 m calculate the seepage loss per meter length of the sheet pile (at right angles to the cross section shown). Sheet pie - 4 x 10-cm/sec Impermeable layerarrow_forward4. For the system shown in the figure below: 5.0 m Datum 7.0 m 5.0 m a) Flow rate per meter length of sheet pile, if k = 1 × 10-4 m/s. b) Calculate the total stress at point A, if void ratio of the soil is equal to 0.57 and specific gravity is 2.68.arrow_forward
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