Abstract:

Transportation by trucks on o pen pits account for above 60% of the cost for mining a ton of coal. The transportation productivity and cost mainly depend on the transport distance, the quality, the slope of transport road, the height of loading and the truck load. In the cost of transportation, the raw materials and fuel account for over 70%. For each kind of truck, the cost of raw materials and fuel mainly depend on the quality of road pavement, that typically the rolling resistance. On the temporary, fixed and semi-fixed roads on mines with the rolling resistance from 3÷4%, if reduced to 2%, the truck speed increases by 7%, the fuel consumption (l/1000 T.km) decreases from 15 to 20%, the tire life will increase by 5 to 22%. The method of reducing the rolling resistance is feasible in using the in-situ rock with the appropritate combination of particle grade and additives for each kind of the pit road. The paper analyzes the influencing factors of rolling resistance on the economic and technical indicators of transportation by trucks and recommends the material reinforement-in-situ technology to reduce the rolling resistance for the temporary, fixed and semi- fixed roads at open pits in Quang Ninh