基于冲蚀磨损理论的溜井井壁破损特性理论研究

Theoretical study of damage characteristics on ore pass wall based on the erosion-wearing theory

矿石从溜槽进入溜井后会对井壁产生冲击,确定井壁冲击部位并选择合适的保护方法对于延长溜井的使用寿命有着重要作用。基于冲蚀磨损理论建立矿石冲击下井壁破损的计算模型,结合Hertz接触理论确定体积损失的计算方法。根据溜槽溜井结构,建立矿石的运动模型。以华新钻沟石灰岩矿山为例,分析溜井壁的破损特性。研究结果表明:矿石与井壁发生3次碰撞后落入矿仓,溜井上部围岩的破坏范围小,破损程度大,溜井下部围岩的破坏范围大,破损程度小。从安全和经济性出发,提出分类防护措施。研究结果与实际情况符合较好,所提方法适用于形态平直的井壁,有助于新建溜井的防护设计。

The ore from chute will have negative impact on the wall of the ore pass and it is important to determine the collision position and choose the right protective method for the lifespan extension of ore pass.Based on the erosion-wearing theory,the calculation model of the damage caused by ore impact on ore pass wall is established and the method to calculate the volume loss is determined using Hertz contact theory.According to the structure of chute and ore pass,the motion model of ore is built.Taking the Huaxin limestone mine in Zuangou as an example,the damage characteristics are analyzed.The result shows：the ore will fall into the storage after three times collisions with ore pass wall.The impact area of the upper ore pass wall is small,but the damage is serious.On the contrary,the impact area of the lower ore pass wall is large,but the damage is insignificant.Considering the safety and economic reason,the classified protection measures are proposed.The results are consistent with the actual situation,which shows that the calculation method is suitable for the ore pass with flat wall and is helpful to the protection design of new ore pass.