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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: February 28, 2011 FR: Jason T. DeJong SUBJECT: Assignment No. 6 (Due by 5 pm Friday, March 11) Question 1: A pile foundation is needed to support a vertical column load of 20,000 kN (dead plus live load) with a factor of safety of 3 against bearing failure. The subsurface conditions consist of a deep deposit of sand and silty sand having SPT N 60 values as shown on the Figure below. Bedrock is at a depth of 80 m, and the water table is at a depth of 4 m. Use driven 0.46-m-square prestressed concrete piles. Plot the number of piles needed versus embedded length, considering piles lengths of 10, 15, 20, 25, 30, and 35 m. Compute the pile capacities using the procedures in section 13.5 (of Salgado 2006) that are attributed to the following group of authors: Randolph (2003), Salgado et al. (2004), Foye et al., and Salgado and Prezzi (2006). Recommend an efficient design, including the Randolph (2003), Salgado et al....
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This note was uploaded on 03/24/2011 for the course ECI 173 taught by Professor Dejong during the Spring '11 term at UC Davis.
- Spring '11