TEXAS A&M UNIVERSITY CVEN 365: Introduction to Geotechnical Engineering Professor Briaud Assignment #6 -Seepage - Due 10/23/2003 at 8:00 AM Any late assignment will receive a grade of zero. Not turning in an assignment before the end of the course will result in a failing grade in the course. 1. If the flow in Figure 1 is a laminar uniform flow, draw the flow net (equipotential lines and flow lines) in the tube AB filled with sand. Then plot the hydraulic head distribution (h e = elevation head, h t = total head, and h p = pressure head). 05m10mABHead Figure 1.2. Calculate the following hydraulic variables in Figure 2. - The pore water pressure at B (u b) - The elevation head (h e), total head (h t), and pressure head (h p) at B - The exit hydraulic gradient (i e) and the critical hydraulic gradient (i c) - Determine the factor of safety against a quick sand condition and explain. 3. Determine the pore water pressure at A, B, and C in Figure 3 and calculate the resultant uplift force on the dam. 4. Evaluate the flow rate through the earth dam in Figure 4. 5. In Figure 5, at what value of h does the sand become a quick sand and how far would you sink if you fell in it? qhlA Figure 518.60m12.80m9.14mImperviousB17.07m10m0m20m Figure 2. Cofferdam 10m0m20m9.75m15.24m8.53m1.52m1.83m21.33mImperviousABC Figure 3. Spillway 10m0m20mBImpervious1.22m12.19m4.27m20.42m11.59m51.82m Figure 4. Earth dam