关键词: 运动特征, 碰撞, 颗粒介质, 离散元, 溜井

Abstract: In order to understand the movement characteristics of granular matters in the ore pass， a numerical analysis model of the non-smooth wall pass， in that the difference of shaft fluctuation will obey Gaussian distribution， and the scraper spherical stochastic particle group drawing was established by using particle discrete element method and Hertz-Mindlin nonlinear contact model， and considering the characteristics of shaft wall morphology and the composition of ore-drawing blocks. The statistical characteristics of collision and movement of particle groups in different sections of the chute were analyzed. The results showed that: ① the collision of particles on the chute wall is due to the inconsistency of velocity when the particles leave the bucket， and the collision frequency reaches the highest value from the wellhead to the depth of -18 m to -30 m；② the frequent occurrence area of particle collision is below the wellhead and extending to the depth of 2/3 well， the average velocity of particles in this area changes a little， and the damage degree of the wellbore is mainly affected by the collision frequency of the particles. After that， the average velocity of particles increases rapidly；③ the bucket rotation speed has less impact on the collision frequency and average velocity of particles on the wellbore，slowing bucket rotation speed can move the particles downward the collision concentration area；④the frequency variation of collision on both sides of the wellbore is affected by the fluctuation difference of the wellbore. The total frequency of collision increases with the increase of the fluctuation difference.

Key words: Movement features, Impact, Granular matter, Discrete element, Ore pass