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An earthwork contract requires to cut and move excavated rocks. The site is a typical limestone...

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Civil Engineering

An earthwork contract requires to cut and move excavated rocks.The site is a typical limestone rock formation in a cut section,which is 15,000 ft long, 85 ft wide, and 3 ft deep. Seismographictests indicate a seismic wave velocity of 5,000 fps for the rocklayer material. The contractor proposes to rip the rock with a370-hp crawler tractor. Answer the following questions.
What is the total duration of the rock cut project assuming 10hours per day work?

Answer & Explanation Solved by verified expert
4.2 Ratings (606 Votes)

Detailed solution is as follows,

Tractor Productivity

For the given seismic wave velocity,ie., 5,000 fps and using 370 hp tractor ,referring the tractor production chart,

Productivity =560 bcy/hr

Quantity of rock

Given Length =15000 ft

Width = 85 ft

depth =3 ft

Volume of rock = 15000 x 85 x 3

                       =3825000 cft

Total duration required to cut

Per day productivity =productivity per hour x no of hours worked in a day

                             =560 x 10

                             =5600 cft

No of days required to complete the work = total volume/productivity per day

                                                            =3825000/5600       

                                                            =683 days
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