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Homework 7 - 2009 - excavation to keep the excavation...

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The University of Missouri-Columbia Department of Civil Engineering Assigned: Friday, September 25, 2009 Due: Friday, October 2, 2009 CE 3400 – Fall 2009 Homework No. 7 – Capillarity and Uplift 1. A 40-foot thick layer of saturated clay is underlain by a layer of sand as shown below. There are artesian water pressures in the sand. Calculate the maximum depth of cut, H, that can be made in the deposit without the bottom of the excavation becoming unstable. (Assume the total head in the sand is constant). 40 ft. 15 ft. H = ? 30 ft. Clay Sand γ sat = 120 pcf γ sat = 118 pcf 2. An 8-meter thick layer of saturated clay is underlain by a layer of sand as shown below. An excavation is to be made in the clay to a depth of 6 meters. There are artesian water pressures in the sand. What depth of water, h, must be left in the
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