Research on Shock Mechanism for Flying Gangue in Steeply Dipping Seam Mining

ABSTRACT

Aim at the random problems of flying gangue movement in steeply dipping seam mining, based on the spherical flying gangue movement model, computational formula of collision restitution coefficient was established when flying gangue shocks bottom plate of working face according to the theory of Hertz classical elastic collision; Considering the influences of the randomness such as the density, radius size, impact velocity of flying gangue, the elastic modulus, Poisson’s ratio of contact bottom plate of working face, the motion model of flying gangue with stochastic parameter was constructed by applying the random factor method; and the mean value and the variance of the collision restitution coefficient were derived by using the algebra synthesis method and moments method. The numerical examples show that the randomness of parameters has a rather large influence on the collision restitution coefficient of flying gangue in steeply dipping seam mining.

Keywords: