CEE 498 - HW2

# CEE 498 - HW2 - CEE 498 Fall 2004 HW 2 1 An earth fill when...

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CEE 498 Fall, 2004 HW 2 1. An earth fill, when completed, will occupy a net volume of 187,000 cu yd. The borrow material which will be used to construct this fill is a stiff clay. In its “bank” condition, the borrow material has a wet unit weight of 129 lb per cu ft ( ( ), a moisture content ( Τ %) of 16.5%, and an in-place void ratio ( Θ ) of 0.620. The fill will be constructed in layers of 8-in. depth, loose measure, and compacted to a dry unit weight ( ( d ) of 114 lb per cu ft at a moisture content of 18.3%. Compute the required volume of the borrow pit excavation. Water Content (wet) = (Wet Weight – Dry Weight) / Dry Weight 16.5% = (129 lb/cu ft – Dry Weight) / Dry Weight Dry Weight = 110.73 lb/cu ft Water Content (dry) = (Wet Weight – Dry Weight) / Dry Weight 18.5% = (Wet Weight – 114 lb/cu ft) / 114 lb/cu ft Wet Weight = 134.86 lb/cu ft Excavation = 187,000*(110.73/134.86) = 153,541 cubic yards 2. The haul road from the borrow pit to the fill has an adverse grade of 4%. Wheel-type hauling units will be used on the job and it is expected that the haul road rolling resistance will be 100 lb per ton.

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