Soil Engineering Assignment

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Engineering

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1. A concrete dam with a sheet-pile cutoff wall is to be used to retain a 12-foot depth of water. The dam is 150 ft long, and the flow net is shown in the figure below. The granular soil has a coefficient of permeability of 0.007 fps (isotropic soil). The seepage loss (cfs) under the dam is most nearly. 12t CONCRETE DAM SHEET.PILE WALL DRAIN IMPERVIOUS BASE Figure 1 2. Given the homogenous earth dam and flow net shown, what is most nearly the approximate seepage rate per unit width of dam if the water height behind the dam is 28 ft? The coefficient of permeability, k, is 5.7 x 10 ft/min. 28 ft 3. For the 70 ft wide sheet pile dam shown, approximate the seepage rate. The coefficient of permeability for the soil is 4.5x 10 in/sec. -top of sheet pile 40 ft soil rock N 4. A falling-head permeability test with the parameters shown was performed on a laboratory sample. According to the test results, it takes 75 s for water to stop flowing through the exit valve. Calculate the coefficient of permeability of the sample. 125 cm 65 cm 50 cm At = 75 s 15 cm soil 5.5 cm 3 5. In a constant-head permeability test, a soil sample is compacted into a round PVC pipe and placed into a tank as shown. After sufficient time is allowed for saturation of the soil, the test is conducted under standard temperature-pressure (STP) conditions for 5 hours. A total of 254 grams of water is decanted into a measuring vessel during the test. The coefficient of permeability is most nearly. PVC pipe, 20.3 cm diameter water 91.4 cm 45.7 cm soil 38.1 cm tank measuring vessel 4 6. For the completed flow net of the figure below, compute the flow under the dam per meter of dam if the coefficient of permeability is 7.2 x 10 cm/s 50 m 6.3 m 1.6 m DA A go K o 9.4 m 17.2 m 5
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Running head: Soil Engineering

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Soil Engineering:
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Soil Engineering

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Q1) Head exists between downstream & upstream surfaces hence H2O will seep through
permeable soil underneath the dam.
Quantity of seepage per unit length of dam is given by, q = (k.H. Nf/Nd)
Where: k is the permeability coefficient, H is the head, Nf is the No. of flow lines, Nd is
the No. of equipotential drops.
K is already given as 0.007 fps, H is 12 ft, Nf...


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