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23 March, 17:52

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

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  1. 23 March, 18:02
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    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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