where, 𝑁𝑡𝑚 – standard of machine time per the ENiR (annex. №1 tab.22);
𝐿– distance of ground transportation, (km);
𝑉𝑟– average speed of loaded truck (annex. №1 tab.16.1);
𝑉𝑛– average speed of empty truck (annex. №1 tab.16.1);
𝑡𝑝– detrucking time (annex. №1 tab.16);
𝑡𝑚– duration of auxiliary operations (installation time for loading, unloading, expectation at the
excavator, admission of the oncoming dump truck), min, (annex №1. table 16).
Required number of trucks:
𝑁 = Т𝑐
𝑡𝑙
The number N is rounded to the nearest smallest integer number, including the over–fulfillment of the shift tasks during excavator work.
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