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# HW1 - CVEN 3708 Geotechnical Engineering 1 Spring 2014...

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Page 1 of 2 CVEN 3708 Geotechnical Engineering 1 Spring 2014 Problem Set 1: Grain Size and Phase Relations Date Posted: Jan. 22 nd Date Due: Jan. 29 th , before 1pm, TA mailbox Problem 1. An industrial facility is planned for a site in California. The facility will consist of a frame structure that is 50 ft by 80 ft in plan. The regional geologic information indicates that the facility will be founded on a stiff, highly plastic clay. A boring was drilled at the site, and the following data were measured on a sample obtained from a depth of 5 feet below the ground surface: Total unit weight = J t = 120 pcf Water content = w = 25% Specific gravity = G s = 2.73 a. (20 points) Determine the degree of saturation (S), void ratio (e), porosity (n), and the dry unit weight ( J d ) for this sample of clay. b. (15 pts) Due to concerns with the expansiveness of the clay, it has been proposed to excavate and replace 8 feet of clay from the site below the building footprint.

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