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hw3-sp10 - Determine the total elevation and pressure heads...

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CE 467L Geotechnical Engineering Spring 2010 Homework 3 Due: Thursday, February 11, 2010 1. Complete Problem 2.1 in Craig. 2. A sample of medium quartz sand (G s = 2.65) is tested in a constant head permeability test. The sample diameter is 5 cm and its length is 12 cm. The dry mass of the sand sample (M s ) is 385 g. Under a constant, applied head of 50 cm, 113 cm 3 of water was measured to flow through the sample in 5 min. Calculate the following: a. The coefficient of permeability, k b. The discharge velocity, v c. The seepage velocity, v 3. One-dimensional flow is occurring through the 6-cm by 6-cm square by 20-cm-long column of soil shown in Figure 1. The centerline of the column is indicated by the dashed line.
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Unformatted text preview: Determine the total, elevation, and pressure heads at points A, B, and C. Choose the datum to be at the tailwater elevation. 4. For the 1-D flow configurations (1) and (2) shown in Figure 2, determine the elevation head, total head, and pressure head at the top and bottom, and on plane X-X in the soil column. Calculate the pore water pressure on plane X-X for configurations (1) and (2). 5. List the six possible solution methods that Craig mentions for deriving the flow net, the solution to the 2D seepage problem (note, one of them applies to solving only relatively simple problems). (Section 2.4). 25 cm 40 cm 20 cm filters/diffusers 5 cm 30º B • C • A • 12 cm Figure 1 Figure 2...
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