Abstract: In the adit chute transportation system of open-pit mine,the initial collision destruction of the ore on the wall of chute is large,it is of great significance to determine the initial collision position of ore for the protection of the chute wall.Based on the kinematic theory,the ore motion model is established,taking an open-pit mine as the study example,the influence of collision restitution coefficient,sliding-rolling friction coefficient and critical coefficient to the initial collision position are analyzed in detail,and the initial collision scope is determined based on based on the pseudo-random algorithm.The results show that:with the increasing of normal restitution coefficient and sliding-rolling friction coefficient,the tangential restitution coefficient and critical coefficient are lowered,the distance between the initial collision position and the wellhead is enlarged,the sliding-rolling friction coefficient is the main influence factor of initial collision position;the change of motion state has little effect on the initial collision position;the distribution of the initial collision position in the the collision scope is distributed exponentially,the chute wall in the range of 6~9 m from the wellhead should be protected effectively.

Key words: Initial collision position, Collision restitution coefficient, Sliding-rolling friction coefficient, Critical coefficient