Bundle: Principles Of Geotechnical Engineering, Loose-leaf Version, 9th + Mindtap Engineering, 2 Terms (12 Months) Printed Access Card
9th Edition
ISBN: 9781337583817
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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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).
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 c
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.
Chapter 8 Solutions
Bundle: Principles Of Geotechnical Engineering, Loose-leaf Version, 9th + Mindtap Engineering, 2 Terms (12 Months) Printed Access Card
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- 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_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
- 4- 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_forwardA 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_forward
- A flow net for flow around a single row of sheet piles in a permeable soil layer is shown in Figure. Given that kx = kz = k = 5x10-3 cm/sec, determine: a) How high (above the ground surface) the water will rise if piezometers are placed at points a and b. %3D b) The rate of seepage through the permeable layer per unit length. c) The approximate average hydraulic gradient at c. Water level 5.6 m Water table 2.2 m Ground surface How channel 1 Flow channel 2 = 1 1 a How channel 3 0.38 Scale 5 m Impervious layer 1. - 01arrow_forwardExample 3: A flow net for flow around a single row of sheet piles in a permeable soil layer is shown below Given that K, = K, =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 5.6 m Water table 2.2 m Ground surface Flow channel I Flow channel 2 Flow channel 3 b. 0.38 Scale 5 m Impervious layerarrow_forwardA flownet for flow around a single row of sheet piles in a permeable soil layer is shown in Figure 1 below. Given the hydraulic conductivity is 5 x 10-3 cm/sec. Determine:arrow_forward
- 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_forwardExample 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_forwardHOMEWORK 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_forward
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