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Engineering · Civil Engineering
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A limestone formation with an average depth of 3 ft is exposed over the full 85-ft width and 15,000-ft length of a highway cut. Preliminary seismic investigations indicate that the rock layer has a seismic velocity of 5,000 fps. The contractor proposes to loosen this rock by using a single shank ripper on a power shift, track-type tractor. The job conditions relative to lamination and other rock characteristics are average, or midway between adverse and ideal. A 45-min hour working efficiency is possible. The contractor wishes to explore the use of two 370-hp dozers. O&O cost for the tractor ripping application is $130 per hour including rippers. The operator wage is $23 per hour. What is the unit cost to rip this rock? What wl be the total cost of the work, and how many hours will the project require? 7.9 s in this
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