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# Hwk #2 - 901-948-0681 CEE 498 Construction Project...

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901-948-0681 CEE 498 Construction Project Management Homework #2 1. Net volume of earth fill = (volume of earth fill)*(yd-ft converter) = (187,000 cu yd)*(27 cu ft) = 5049000 cu ft Dry weight = (volume)*(dry unit weight)*(18.3 % moisture) =(5049000cu ft)*(114 lb/cu ft)*[(100-18.3)/(100)] = 470253762 cu ft Wet weight = (dry weight)*(1+moisture content) = (470253762 cu ft)(1.165) = 547845632 cu ft Wet weight per unit = (wet weight) / (wet unit weight) = (547845632 cu ft) / (129 lb/cu ft) = 4246865 lb/cu ft Volume of pit excavation = (wet unit weight) /(in place void ratio) = (4246865 cu ft)/(.620) = 6849782 cu ft 2. Equivalent grade = rolling resistance / G% = (100 lb/ton) / (20 lb/ton) = 5% effective grade Effective grade = adverse grade + equivalent grade = 4% + 5% = 9% Effective grade (return trip) = -4% + 5% = 1% This is because on the return trip, the adverse grade does not effect the hauling units. Finally, the total resistance on the return trip is equal to the rolling resistance les 80 lb/ton

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Hwk #2 - 901-948-0681 CEE 498 Construction Project...

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