Draw a flow net for the weir shown in Figure B, then calculate the rate of seepage under the weir. In addition, evaluate the exit gradient in the first flow channel of the last field against the critical gradient. Assume e = 0.60, and G; = 2.60,
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- Determine the total flow rate through all channels per unit length of the respective Flownet of sheet pile. Given coefficient of permeability, k = 5 x10-5 cm/s (refer Figure below if Nf=3.5) h = 30 m h2= 10 m O 0.0021 cm2/s O 0.00125 cm2/s O 0.0438 cm2/s O 0.0056 cm2/sExample 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 laverHOMEWORK 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/cm
- A DrahmedsoilMechanicsnoteschapters pdf Downloads/DrahmedsoilMechanicsnoteschapter5.pdf 5.16 Refer to Figure in which upward seepage is taking place through a granular soil contained in a tank. Given: H1 = 1.5 m; H2 = 2.5 m; h = 1.5 m; area of the tank = 0.62 m?: void ratio of the soil, e = 0.49: G. = 2.66; and hydraulic conductivity of the sand (k) = 0.21 cm/sec. a. What is the rate of upward Valve fopen) seepage? b. Will boiling occur when h =1.5 m? Explain. c. What would be the critical value of h to cause boiling? Inflow Ans.: (a) q = 781.2 cm'isec, (b) No. (c) h = 2.77m 5.17 Refer to Figure of Problem 5.16. If H, = 0.91 m, H2 = 1.37 m. h =0.46 m, Ysat = 18.67 kN/m, area of the tank = 0.58 m2, and hydraulic conductivity of the sand (k) = 0.16 cm/sec, a. What is the rate of upward seepage of water (m/min)? b. If the point C is located at the middle of the soil layer, then what is the effective stress at C? Ans.: (a) i= 0.336, (b) q = 0.0187 m/min 5.18 A cut is made in a stiff,…Determine the settling and horizontal velocity of grit chamber to remove grit particle with size of 0.2mın from wastewater if average area of grit chamber =0.058m². Determine the required length of chamber and the depth at average and minimum flow and dimension the weir plate if the width of control flume 0.2m? (Qmin=0.2Qavg, Qmax=4Qavg) 17A sheet pile has an embedment depth of 12 m in a homogeneous soil stratum. The coefficient of permeability of soil is 10-6 m/s. Difference in the water levels between the two sides of the sheet pile is 4m. The flow net is constructed with five number of flow lines and eleven number of equipotential lines. The quantity of seepage (in cm³/s per m. up to one decimal place) under the sheet pile is
- Given h = 30 m, D= 40 m and the soil beneath the dam has a hydraulic conductivity of 3×103 cm/s. Compute 1) pore pressure at point b, and 2) the flow rate under the sheet pile. given = h = 30m D=40m NF No *units meters 0.8h h 30 640) 0.7h 0.6h 0.5h Sheet pile D12-c 7777 0.4h b 0.34 0.2h4- 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 layerThe weir shown below is 50 m long ● Draw a flow net for the flow under the weir Calculate the rate of seepage for the entire weir. Calculate the total uplift force acting on the weir base. Calculate the exit hydraulic gradient near the toe of the weir ● ● קק →★★ 10 m 24 m 37 m Sheet pile ==1.5 m 3 m 9 m k = 10-3 cm/sec Impermeable layer
- The 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?1. Design a pipe culvert using the following data. Also, draw the longitudinal section of the culvert. Discharge in the stream: 4 m/s Road top level: 106 m Road bottom level: 101.5 m Road width: 7.5 m with 1 m wide shoulders Density of the soil at site: 18 kN/m3 Loading: IRC Class A C. = 1.8The 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.