Q3: B- : For a given flow net of water flow around a sheet pile in Figure below, if the critical hydraulic gradient equal to 0.941, compute the minimum length of the sheet pile (d) which keep it safe against quick sand by Terzaghi's method. Sheet pile Ah =1.1m AC E dx d/2 section Sandy soil: Impervious Layer

Q3: B- : For a given flow net of water flow around a sheet pile in Figure below, if the critical hydraulic gradient equal to 0.941, compute the minimum length of the sheet pile (d) which keep it safe against quick sand by Terzaghi's method. Sheet pile Ah =1.1m AC E dx d/2 section Sandy soil: 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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Example A flow net for flow around single row of sheet piles in a permeable soil layer is shown in the figure. Given Sheet pile kx = k = k = 5xl10-3 cm/sec. Determine: 1. How high (above the ground 0 surface) the water will rise if piezometers are placed at points a, b, c, and d. 2. The total rate of seepage II II -4.5 Nr= 3 through the permeable layer per unit width. 3. The rate of seepage through the flow channel II per unit width (perpendicular to the section shown) -9.0 Datum Imnermeahle laver
A concrete pile 20 m long with a cross section of 400 mm x 400 mm is fully embedded in a saturated clay layer. The clay has the following properties: γsat = 18.5 kN/m3, ϕ= 0 and cu = 70 kPa. Assume that the water table rises to the tip of the pile. Determine the allowable load that the pile can carry (FS=3). Use the α and λ method to estimate the skin resistance.
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.
A driven closed ended pipe pile is shown below a) Find the ultimate point load b) Determine the ultimate frictional resistance, Qs; use K=1.4 and 8=0.60. c) Calculate the allowable load on pile; use FS=4. y = 15.7 kN/m3 0 = 32°, c = 0 Sand 3 m GWT Ysat = 18.3 kN/m ¢ = 32°, c= 0 3 m Sand Sand Ysat = 19.2 kN/m 0 = 40°, c = 0 15 m Dia = 381 mm
A 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=2.8
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
Q-4: The following figure shows the flow net for seepage of water around a single row of sheet piles driven into a permeable layer. Calculate how deep the sheet pile should be driven (h) to achieve factor of safety = 3 against downstream heave, given that ysat for the permeable layer = 18 kN/m3. (Note: Thickness of permeable layer T = 18 m) H₁ = 10 m (h) Heave zone Sheet pile ►||1| Impermeable layer H₂ = 2 m Ysat 18 kN/m³
A horizontal impervious floor of length 20 m is provided with a sheet pile of 5 m depth at its downstream end. The head causing flow is 3 m. If the specific gravity of soil is 2.68 and void ratio of soil is 0.70 then the factor of safety against piping (by Khosla's theory) would be (Correct upto 1 decimal place).
3. Consider the sheet pile wall shown below. Assume the water is 20m above the ground surface on the left side of the sheet pile and the wall penetrates 18m below the ground surface. Using the flow net shown below and assuming k=0.05 m/day. Calculate: 1) quantity of water flow in 5 days for each meter length into to page, and 2) the water pressure at point A. 5m B
A circular pile 0.65m in diameter and 13m long is embedded in loose sand. Site investigation suggests a dry unit weight of 17.35 kN/m3, moisture content of 9% above the water table, specific gravity = 2.65, and a saturated unit weight of 21.46 kN/m3 for the soils beneath the water table (2.75m below the surface). Nq = 95, k=1.35, tan α= 0.35 and FS = 3.0. Calculate the end bearing capacity Determine the skin friction capacity of the pile Find the allowable load if the factor of safety is 3.0 Please answer this asap. For upvote. Thank you
(i) A weir across an alluvial river has a horizontal floor of length 80 m and retains 8 m of water under full pond condition. If the downstream sheet pile is driven to a depth 8 m below the average bed level, then calculate the exit gradient. Also assuming a porosity of 25% and the relative density of soil particles as 2.70, determine the critical exit gradient and the factor of safety of the system with respect to the exit gradient.
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