SUBSTANTIATION OF BULLDOZER-EXCAVATOR-AUTOMOBILE COMPLEX FOR REMOVAL OF OVERBURDEN LAYER OF FLUVIOGLACIAL DEPOSITS IN THE CONDITIONS OF SOSNIVSKY GRANITE DEPOSIT

Purpose and task. The aim of the research is to substantiate the expediency and efficiency of using a bulldozer-excavator-automobile complex with the use of ripper bulldozers to remove the overburden layer of fluvioglacial deposits in the conditions of the Sosnivsky granite deposit. To achieve this goal, it is necessary to: establish the patterns of distribution and features of fluvioglacial deposits; to analyze possible technological schemes of development of gravel and sand deposits; justify the need and effectiveness of the technological complex of equipment for the removal of fluvioglacial deposits in the quarry; to establish the dependence of the variable productivity of the excavator on the average size of the piece of rock. Research methods. An integrated approach was used to solve the set tasks: analysis and generalization of previous research on the peculiarities of fluvioglacial deposits and the possibility of using equipment complexes for the development of gravel and sand mountains; technological substantiation of the offered engineering and scientific decisions; analytical calculation of variable productivity of the excavator depending on the average size of a piece of rock. Scientific novelty. The possibility of using a bulldozer-excavator-automobile complex of equipment for removing the overburden layer of fluvioglacial deposits in rock quarries has been substantiated. The analytical dependence of the change in excavator productivity on the average piece size of fluvioglacial deposits is obtained. Conclusions and practical significance. It is established that when the average size of gravel-sand material changes from 20 to 200 mm, the productivity of the excavator decreases by 1,59 times. It is proved that the productivity of the excavator type "straight shovel" is 17% higher than the productivity of the backhoe excavator. For the conditions of the Sosnivsky granite deposit quarry, where the weighted average size of a piece of fluvioglacial sediment is 171 mm, the variable productivity of the excavator is: according to the first technological scheme (hydraulic backhoe excavator placed on the roof of the sediment) – 474,1 m3/shift; according to the second technological scheme (excavator "straight shovel" is located on the lower production horizon) – 553,1 m3/shift. Keywords: fluvioglacial deposits, quarry, technological schemes, equipment complex, excavator productivity, gravel-sand rocks.