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Homework 6 - 2009 - (c How do the effective stresses...

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The University of Missouri-Columbia Department of Civil Engineering Assigned: Wednesday, Sept 23 2009 Due: Monday, Sept 28, 2009 CE 3400 – Fall 2009 Homework No. 6 – Effective Stress 1. Work Problem 10.8 in Coduto. 2. Work Problem 10.10 in Coduto. 3. A 100 foot thick layer of clay lies beneath a large lake. The clay is saturated and has a water content of 65 percent. The specific gravity of solids, Gs is estimated to be 2.7. The water depth in the lake is 75 feet. Plot the total stress, pore water pressure, and effective stress as a function of depth below the top of the clay for the following conditions: (a) With the lake at its current level (assume no flow and no change in head in the soil). (b) With the lake lowered so that the water depth in the lake is reduced to 50 feet. Again, assume no flow once the new lake level is established.
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Unformatted text preview: (c) How do the effective stresses calculated in parts (a) and (b) compare? 4. A 50 foot thick deposit of gravel overlies bedrock. The gravel has a void ratio of 0.42 and the specific gravity of solids is 2.65. The water table is at the ground surface. (a) Plot the vertical effective stress vs. depth in the gravel. Plot the stresses as you were instructed for Problem 10.8 in Coduto, i. e. plot depth on the vertical axis with zero at the top and depths increasing downward. (b) A wide earth fill is slowly constructed on the gravel. The fill is 15 feet thick and has a total unit weight of 125 lbs./cu.ft. The water table remains at the elevation of the original ground surface. Plot the effective stress vs. depth in the gravel after the fill is placed. Plot these data on the same plot as the one for effective stress before fill construction....
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