Rational parameters of contour breaking when stripping overburden rock in facing stone quarries

Energy Parameters of Rock Fracture With a Wedge-Shaped Tool

“…The energy intensity E, (speci�ic or surface energy), which is the amount of energy (work) required to separate a unit volume of rock from the massif, can be considered as a determining factor of the ef�iciency of the fracturing process. Indeed, the lower the energy intensity, the more perfect the fracturing process is [6][7][8][9][10][11][12][13][14][15].…”

“…The lowest energy intensity of fracture is achieved in tensile fracture, as the modulus of deformation (Young's modulus) E, Poisson's coef�icient and tensile strength of rocks are much lower than the ones derived as a result of compression or bending. It has been experimentally proven that Young modulus in tension is 1.1-1.3 times less than in bending and Young modulus in bending is 0.25-0.35 of Young modulus in compression [4][5][6].…”