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Unformatted text preview: 1 University of California, Davis Department of Civil and Environmental Engineering ECI-173 Foundation Design MEMORANDUM TO: ECI-173 Students Date: January 24, 2011 FR: Jason T. DeJong SUBJECT: Assignment No. 3 (Due by 4 pm Monday, January 31) Question 1: A 100-ft by 300-ft rectangular building will be supported on a mat foundation. The mat will be 6 feet thick, and its top surface will be 20 ft below the ground surface. The mat will carry a gross uniform bearing pressure of 6,000 psf (not counting its own weight); for analysis, we can assume the gross bearing pressure spreads from the top surface of the mat, and that the net weight of the mat itself is zero. The site is underlain by a deep, relatively homogenous, deposit of over-consolidated clays that have an average recompression ratio (C r ) of 0.025, an average coefficient of consolidation (c v ) of 0.1 ft 2 /day, an average total unit weight of 128 pcf, and an average Skempton's A parameter of 0.40. The clay is expected to remain overconsolidated under the weight of 128 pcf, and an average Skempton's A parameter of 0....
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- Spring '11