For the sheet pile wall shown in figure below, find 1- Quantity of seepage (k= 0. 5 * 10-3 m/sec) 2- Pore water pressure at points A and B 3- Factor of safety against piping e = 0.75 m 3.0 m 1.5 m 4.5 m 3.0 m 6.0 m impermeabie stratum
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- A 50 cm square precast pile is driven by 9 m into a sandy soil. The standard penetration test results, prformed on this ground, are given in the table below: Depth below ground surface (m) SPT (Nss) 1.5 3.0 4.5 4 6 6.0 12 12 20 24 35 39 If the skin resistance is equal to {T, = 2 x (average Nss along the pile shaft)) kPa. Compute the factor of safety available, if 1100 kN of compressive load is applied on this pile. 7.5 9.0 10.5 12.0For 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 50 cm diameter precast pile is driven by 9 m into a sandy soil. The standard penetration test results, prformed on this ground, are given in the table below: Depth below ground surface (m) 3.0 4.5 6.0 7.5 9.0 10.5 12.0 SPT (N55) 6 12 12 20 24 35 39 1.5 4 If the skin resistance is equal to (ts=2 x (average Nss along the pile shaft)} kPa. Compute the number of piles that needed to support a total load of 4400 KN with factor of safety (2.5).
- The flow net around a sheet pile wall is shown in the sketch. The properties of the soil are permeability coefficient = 0.09 m/day (isotropic), specific gravity = 2.70 and void ratio =0.85. The sheet pile wall and the bottom of the soil are impermeable. 10 m 1.5 m 3m 4.20 The factor of safety against the occurrence of piping failure isA flow net for seepage under a sheet pile wall has n₁= 4, n=8 and the permeabilities of the soil in the horizontal and vertical directions are: K₁ = 8 x 10-¹5 m/sec and K₁=2x10-5 m/sec. If the head loss through the soil is 2 m, the quantity of seepage per meter length of the wall will be1. Refer the Fig. 1. Estimate the side resistance Qs by a. Meyerhof's method. K= 1.5 and d'= 0.6 Ø Coyle and Castello's method b. Concrete pile 460 mm x 450 mm I Loose sand 20 m 0', -30° Y=18.6 kN/m³ TE Dense sand 0₂-42* Y-18 6 kN/m² Fig. 1
- 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 wallA rock storage pile is being designed for a mine in West Virginia. The pile is linedwith reinforced GCL overlain by a 1.5 mm thick HDPE geomembrane. A heavy nonwoven geotextile is placed on top of the geomembrane. Because the rock is porous(K = 10-2cm/s), it is used as the main LCS stone and no additional leachate collectionstone is being installed. Specify the base slope required to keep the head below 25cm if the design storm is 0.8 cm rain/day and the pipe-to-pipe lateral spacing is 60 mIs this rock a reasonable material to replace the LCS stone?for the following conditions, determine the groundwater infiltration. new two lane highway, lane width 12ft; shoulder width 10ft; length of crack 20ft; rate of infiltration 0.5ft^3/day/ft^2; spacing of crack 25ft kp=15*10^-5 ft/day
- m DrahmedsoilMechanicsnoteschapter5.pdf Downloads/DrahmedsoilMechanicsnoteschapter5.pdf Example 5.15 A sheet pile wall drove into silty having 5*10-8 m/sec. find the quantity of soil a 7 m permeability of 1.75 m 15m seepage, pore water 1.0m 3.5 m 0.75m pressure at points (A to J), and exit gradient. 7 m Impermeable la Solution • The sheet pile wall length is in direction perpendicular to the page • The problem is two-dimensional flow • LB is upstream equipotential line • JK is downstream equipotential line • BF, FJ, and MN is flow lines • H = 7- 1.75 = 5.25 m, Nr = 4, Na = 8 = 5. 10-8. 5.25 = 13.125 + 10-8 m/sec/m length q = kH The difference in the total head is 5.25m and the Na = 8 so in each drop. loose 5.25/8 = 0.656mRefer 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 frictionExample 5.15 A sheet pile wall drove into having silty permeability m/sec. find the quantity of soil а 7 m of 5*10-8 L. 1.75 m 1.5m seepage, pore water 1.0m 3.5 m 0.75m pressure at points (A to J), and exit gradient. 7 m M Impermeable layer