A contractor needs to excavate 50,000 yd3 of silty clay and haul it with Caterpillar 69C dump trucks. Each truck can carry 30.9 yd3 of soil per load, and operates on a 15-minute cycle. The job must be completed in five working days with the trucks working two 8-hour shifts per day. Using a bulking factor of 30%, how many trucks will be required

Number of trucks required = 203

Explanation:

Calculate the amount of soil need to be excavated from the borrow site by using the following equation:

VF = Vf + (◇V/◇Vf) × Vf

Here,  ◇V is change in volume during grading, Vf  is the Volume of fill, and ◇V/◇Vf  is the bulkage factor

Substitute in the equation.

VF = 50000 + (30/100) 50000

VF = 50000 + 15000

VF = 65000yd^3

Number of trucks needed = (Truck cycle time / Excavator time ) × VF

Number of truck heeded= (15 / (16× 5 ×60) × 65000

Number of trucks = 975000/ 4800

Number of trucks = 203

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