CEE380_HW02_S16(1) - UNIVERSITY OF ILLINOIS...

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UNIVERSITY OF ILLINOIS, URBANA-CHAMPAIGN NAME: _______________ DEPARTMENT OF CIVIL & ENVIRONMENTAL ENGINEERING DATE: _______________ 1 CEE 380 – Spring 2016 HW#2 Gradation, Soil Properties, and Soil Classification - Due Feb 5, 2016 NOTE: PLEASE SHOW YOUR CALCULATIONS IN A CLEAR FORM REMEMBER TO INCLUDE UNITS IN YOUR CALCULATIONS 1. The mechanical sieve analysis data for three soils is given in the following table. For each soil: a. Plot the grain size distribution curve on five-cycle semi-logarithmic paper (or an spreadsheet plot with 5 log cycles on the x-axis). Note: all three grain size distributions should be plotted on the same graph. b. Determine D 10 , D 30 , and D 60 . c. Determine the coefficient of curvature (C c ), and the uniformity coefficient (C u ). d. Gradation of the soil (Well, poor, or gap graded). e. Classify the soil according to the Unified Soil Classification System (USCS). (Remember to show your work/steps.) Sieve # or Size Soil 1 % Passing (by wt.) Soil 2 % Passing (by wt.) Soil 3 % Passing (by wt.) 75mm - - 98 38mm - - 93 19mm - - 86 9.5mm 100 - 72 No. 4 97 - 48 No. 10 93 100 30 No. 20 90 99 18 No. 40 65 91
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