Establishing the regularities of changes in the productivity of the ripper depending on the particle size distribution of fluvioglacial sediments

Abstract

The results of scientific research on determining the influence of particle size distribution in the sand and gravel mass of fluvioglacial sediments on ripper productivity under the conditions of the Sosnivske granite deposit are presented. Based on the analysis of scientific research and publications regarding the efficiency of loosening rock masses, it was found that it is impossible to account for the granulometric composition of rocks in their natural state when calculating loosening productivity. At the same time, the size of the fractional pieces of cemented and compacted sand and gravel mass significantly affects the choice of the type of loosening equipment. Based on practical experience and scientific research on the study of the peculiarities of the development of fluvioglacial deposits, it is proposed to take into account the granulometric composition of the sand and gravel mass in its natural state through certain components of existing formulas when determining the loosening productivity. Namely, the value of the coefficient that takes into account the influence of the state of the massif on the size of undestroyed ridges and the width of the base of the cut after ripper penetration is recommended to be selected depending on the weighted average size of a piece of sand, gravel, and boulder mass. For the current natural and technological conditions of fluvioglacial deposit mining at the Sosnivskyi quarry, and given the characteristics of the equipment used, loosening productivity was determined for various weighted average rock piece sizes. It was established that as the weighted average piece size changes from 5 to 400 mm, the ripper's productivity decreases from 583,33 to 308,54 m³/h, i.e., by 1,9 times. In the investigated area of the overburden ledge, the ripper's productivity will be 370 m³/h, given that the weighted average size of the sand, gravel, and boulder mass is 171 mm.

Keywords

• mechanical loosening of rocks
• gravel-sand mass
• fluvio-glacial deposits
• overburden
• bulldozer-ripper
• productivity