Assign_2_2011_solution - University of California, Davis...

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University of California, Davis Department of Civil and Environmental Engineering ECI-173 Foundation Design MEMORANDUM TO: ECI-173 Students Date: January 12, 2011 FR: Jason T. DeJong SUBJECT: Assignment No. 2 (Due by Friday, January 21 @ 5pm in Ghaussi, 2 nd floor 173 HW drop-off box) Question 1: Using the Janbu method compute the immediate settlement for the following. A square spread footing, 6 ft in width and embedded 2 ft is subjected to 100k lb load. The footing is embedded in a soft clay, which has the following properties: undrained strength = 3000 psf, unit weight = 115 pcf, and an average OCR = 1.7. The depth to bedrock from the original ground surface is 50 ft. The PI is 55. Solution Compute terms for reading Janbu chart solutions: H/B = 48/6 = 8 D/B = 2/6 = 0.33 I 0 = 0.95 I 1 = 0.7 From chart w/ PI = 55 K ~ 110 Eu = K (Su) =110 * 3000 psf = 33 ksf q b = 100,000 lbs / 36 ft 2 = 2,778 psf w i = I 0 I 1 q b B / Eu = (0.95) (0.7) (2778 psf) (6 ft) / 330,000 psf = 0.034 ft.
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Question 2: A 6-story reinforced concrete frame structure is to be supported on a rectangular mat foundation that is 40 m by 60 m in plan dimensions. The average bearing pressure imposed by the mat foundation will be 60 kPa. The site is roughly flat with little surface vegetation or organic soil. The mat will be 1.0-m-thick, and its top surface will be roughly 0.5 m below the existing ground surface. Subsurface conditions consist of a 15-m
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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.

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Assign_2_2011_solution - University of California, Davis...

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