The flow net around a sheet pile wall is shown in the
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- 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=2.8A sheet pile wall is driven to a depth of 6 m into a permeable sand layer (k = 6X10-3 mm/s) of 13.5 m thickness lying on an impermeable layer. The water on one side of the wall is at a height of 4.5 m, while on the other side, pumps maintain the water level at ground level. Estimate the number of flow linesA 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. a. 600 ml/s/meter length b. 300 ml/s/meter length c. 1200 ml/s/meter length d. 900 ml/s/meter length
- (c) A dam shown in Figure Q1 (c) retains 6m of water. A sheet pile wall on the upstreamside (which is to reduce seepage under the dam) penetrates 4m into a 10m thick of siltysand stratum. Below the silty sand is a thick deposit of clay. Assume that the silty sandis homogeneous and isotropic. (i) Calculate q in cm/s.(ii) Analyze the pore water pressure distribution on the front of the sheet pile (atevery 2m @ at points A, F and G). Given the Nd of points A, F and G are 0.5,1.5 and 3.0 respectively.(iii) Analyze the pore water pressure distribution at the base of the dam. (at every5m @ at points A, B, C, D and E). Given the Nd of points A, B, C, D and E are5.6, 6.7, 8.0, 10.0, 13.0 respectively.(iv) Determine the uplift force under the dam.(v) Calculate the factor of safety against piping. Given Lmin = 0.85m.The Figure below shows a long pile wall driven in sand with Coefficient of permeability K= 0.05cm/sec.it is required to: 1.Estimate the max. possible value of dimension h, where Ah=1.2. 2.Calculate the seepage loss (m /day) per meter of wallThe value of k of soil around a sheet pile is 10-6 m/s. The flow net of this sheet pile consists of 5 flow lines and 11 equipotential lines. Determine the rate of seepage (in cm3/s per m) if the difference in the water level is of 4m.
- For a given flow net around a sheet pile wall, determine the following How high will the water be in piezometers located at point a, b, c and d, Rate of seepage through flow channel II, Total rate of seepage The soil permeability is 5 x 10-3 cm/sec .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 cDetermine the factor of safety against heave on the downstream side of the single-row sheet pile structure shown in Figure 9.30. Use the following soil and design parameters: H1 = 7 m, H2 = 3 m, thickness of permeable layer (T) = 12 m, design depth of penetration of sheet pile (D) = 4.5 m, and γsat = 17 kN/m3
- Redo Problem 14.1 with the following: L1 = 3m, L2 = 6 m, γ = 17.3 kN/m3, γsat = 19.4 kN/m3, and ϕ′ = 30°. 14.1 Figure P14.1 shows a cantilever sheet-pile wall penetrating a granular soil. Here, L1 = 4 m, L2 = 8 m, γ = 16.1 kN/m3, γsat = 18.2 kN/m3, and ϕ′ = 32°. What is the theoretical depth of embedment, D? For a 30% increase in D, what should be the total length of the sheet piles? Determine the theoretical maximum moment of the sheet pile.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 frictionThe sheet pile is driven in the Cebu South reclamation area and the area to one side is pumped down as shown in the flow net. The permeability of the sand is 0.001 m/s. below the elevation of 20 m us an impermeable rock layer. Determine the flow per unit length.How high (above the ground surface) the water will rise if a piezometer will be placed at A?