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 8.2P
To determine
Draw the flow net and calculate the seepage loss per meter length of the sheet pile.
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Draw 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 layer
Estimate the magnitude of k of the clay at a void ratio (e) of 0.9. Use Eq. (2.41).
2.10 Refer to Figure P 2.10 and use these values:
• H = 7 m,
• H, = 1.75 m, D = 7 m
D = 3.5 m
Draw a flow net. Calculate the seepage loss per meter length of the sheet pile (at a
right angle to the cross section shown).
Sheet
pile
H1
H2
D1
k= 6.5 x 10-4cm/sec
Impermeable layer
Figure P2.10
= 0.6.
2.11 A sand has the following: D10 = 0.2 mm, D = 0.4 mm, and void ratio e
a. Determine the hydraulic conductivity using Eq. (2.38).
b. Determine the hydraulic conductivity using Eq. (2.40).
►||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).
Chapter 8 Solutions
Principles of Geotechnical Engineering (MindTap Course List)
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- answer in complete solutionarrow_forwardA flow net for flow around a single row of sheet piles in a permeable soil layer is shown in the Figure below. Given that kx= kz = k= 5.5 x 10-3 cm/sec, H1 = 6.5 m and H2 = 2.3 m determine: i. How high (above the ground surface) the water will rise if piezometers are placed at points a and b ii. The total rate of seepage through the permeable layer per unit length iii. The approximate average hydraulic gradient at carrow_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_forward
- The 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_forwardDraw 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→arrow_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
- Refer to Figure 8.23. Given:• H1 = 6m• H2 = 1.5 m• D = 3 m• D1 = 6 mDraw a flow net. Calculate the seepage loss per meter length of the sheet pile (at a right angle to the cross section shown).arrow_forwardThe 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?arrow_forward11.10 A concrete pile 0.406 m x 0.406 m in cross section is shown in Figure P11.10. Calculate the ultimate skin friction resistance by using the a. a method b. A method c. ẞ method Use =20° for all clays, which are normally consolidated. 6.1 m 12.2 m 0.406 m Figure P11.10 Groundwater table Ysat Silty clay 18.55 kN/m³ Cu = 35 kN/m² Silty clay Ysat = 19.24 kN/m³ Cu = 75 kN/m²arrow_forward
- Question: A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in Figure 1. Given that k = 5 + 10-5 mm/sec Ya = 20 kN/m³ w = 21% n = 20% Determine, a) How high [m] the water will rise if piezometer is placed at point B (above point B). b) The total rate of seepage [m/s/m] through the permeable layer per unit length. c) Magnitudes of effective vertical stress [kN/m³] at A and B. Sheet piling 4.00 m 8.00 m 1.00 m 11.00 m FC 6.00 m 8.00 m Datum Figure 1arrow_forwardA single row of sheet piles is driven into a permeable layer as shown in the figure. Given: H, = 7 m H2 = 4.3 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 = 1 and the number of potential drops is N, = 3. Sheet pile H1 H2 D1 k = 4 x 10-4 cm/sec Impermeable layer Select the correct response: 0.311 m/day/m 1.132 m3/day/m 0.388 m/day/m 0.054 m/day/marrow_forward4- For the weir shown in Figure below, calculate the seepage in the permeable layer in ft/day/ft for (a) x'= 1 ft and (b) x'= 2 ft. Use Harr, 1962. 8 ft 4 ft + Sheet pile k = 10-3 ft /sec Permeable layer Impermeable layerarrow_forward
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