Principles Of Geotechnical Engineering, Si Edition
9th Edition
ISBN: 9781305970953
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, Si Edition
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- A 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_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_forwardRefer 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_forward
- 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?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_forwardQuestion: 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_forward
- A deposit of cohesionless soil with a permeability of 0.3 mm/s has a depth of 12 m with impervious ledge below. A sheet pile wall is driven into this deposit to a depth of 8 m. The wall extendsabove the surface of the soil, and a 3 m depth of water acts on one side. Sketch the flow net and determine the seepage quantity. Provide a diagram a.600 ml/s/meter length b.300 ml/s/meter length c.900 ml/s/meter length d.1200 ml/s/meter lengtharrow_forwardA flow net for flow around a single row of sheet piles in a permeable soil layer is shown in Figure below with a scale as shown. Given that kx = kz=k = 4 x 10-3 cm/sec, determine How high (above the ground surface) the water will rise if piezometers are placed at points a and b The total rate of seepage through the permeable layer per unit length The approximate average hydraulic gradient at c factor of safety against piping x=1.6 y=2.8arrow_forwardTry making the flow net for the following diagram. Given: H1= 6m H2= 1.5 m D= 8m D1= 4m Draw a flow netarrow_forward
- Example 3: A flow net for flow around a single row of sheet piles in a permeable soil layer is shown below Given that K = = Ky = K = 5 x 10-3 cm/sec, determine 1. How high (above the ground surface) the water will rise if piezometers are placed at points a and b. 2. The total rate of seepage through the permeable layer per unit length. 3. The approximate average hydraulic gradient at Water level Ground surface Scale 5m 5.6 m P ► 2.2 m Water table Flow channel 1 Flow channel 2 = 1 1 b Flow channel 3 <= 1 Impervious layer 1 0.38arrow_forwardPlease write legibly, complete solutions, avoid rounding off intermediate values.arrow_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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