Hereditary model of loose mined rock layer deformation in disintegrators

¹ National Mining University, Department of Mining Machines and Engineering, 19 Yavornytskoho Ave., 49005 Dnipro, Ukraine
² National Mining University, Department of Mining Mechanics, 19 Yavornytskoho Ave., 49005 Dnipro, Ukraine

^* Corresponding author: nadutyvp@yandex.ua

Abstract

The objective of this work is to substantiate the hereditary character of the stresses and deformations accumulation in loose mined rock during the disintegrators working surfaces convergence. It is shown, in particular, that the layer porosity after compression and the side thrust coefficient depend not only on the applied pressure, but also on the initial porosity. It is substantiated the mechanism of interrelation between the stresses and deformations of a layer. The experimental researches on fine– grained granite compression in a rigid matrix have been fulfilled. The approximation of obtained results by polynomial functions has been carried out. The coefficients have been determined by the least-square method. The close agreement of the analytical and the experimental values has been recorded. The initial porosity parameter was put into the equation of dependences of the current porosity and the side thrust coefficient on pressure. The mechanism of the forces distribution on separate particles contacts has been explained in terms of the material compacting hystory. The practical value of the research is in calculating the disintegrators operating parts parameters with account of the mined rock layer condition prior to the act of crushing.