(1. School of Resources and Environment Engineering，Wuhan University of Technology，Wuhan，Hubei 430070，China；2. Hubei Key Laboratory of Mineral Resources Processing and Environment，Wuhan University of Technology，Wuhan，Hubei 430070， China；3. Library of Wuhan University of Technology，Wuhan，Hubei 430070，China)
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.
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2017, Vol. 36 
