CO275 ESTIMATING FOR EARTHWORKS PROJECTS Construction Management Fundamentals Lo

Question

CO275 ESTIMATING FOR EARTHWORKS PROJECTS Construction Management Fundamentals Loads and Resistance-HW 2 The haul road fromn 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/ton. What will be the effective grade for the haul. What is the effective grade for the return? 1· If the haul unit in the above example has a loaded gross vehicle weight of 47 tons, and an empty weight of 22 tons. What is the total resistance and effective grade of each part of the trip? (ie, he returns empty) 2.

Explanation / Answer

1)Solution:

Equivalent grade (RR) = 100 1b/ton rolling resistance/201b/ton =5%

Effective grade (TRhaul)=5%RR+4%GR=9%

Effective grade(TRreturn)=5%RR-4%GR=1%

During the haul, the unit must overcome the uphill grade;on the return, the unit is aided by down hill grade.

2)Solution:

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