某露天矿平硐溜井井壁初始碰撞位置理论计算

Theoretical Calculation of Initial Collision Position on Shaft Wall of an Adit in Open-pit Mine

露天矿山平硐溜井运输系统中,矿石在溜井壁上的初始碰撞破坏较大,确定矿石的初始碰撞位置对于井壁的防护具有重要意义。根据运动学理论,建立矿石运动模型,以某露天矿为例,分析碰撞恢复系数、滑移滚动摩擦系数和临界系数对初始碰撞位置的影响,基于伪随机算法,确定初始碰撞位置的范围。结果表明:随着法向恢复系数、滚动滑移摩擦系数增大,切向恢复系数、临界系数减小,初始碰撞位置距井口的距离变大,滚动滑移摩擦系数是影响初始碰撞位置的主要因素;运动状态的改变对于初始碰撞位置的影响较小;碰撞范围内初始碰撞位置的分布符合指数分布,距离井口6~9 m范围内的井壁需要重点防护。

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 an-alyzed 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 coeffi-cient 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 ex-ponentially,the chute wall in the range of 6~9 m from the wellhead should be protected effectively.