倾斜溜井内的矿岩运动特征及其影响因素研究  

Movement Characteristics of Ore-Rock in Inclined Orepass and its Influencing Factors

作　　者：马强英 梁凯歌 马驰 路增祥 秦然 MA Qiangying;LIANG Kaige;MA Chi;LU Zengxiang;QIN Ran(School of Mining Engineering,University of Science and Technology Liaoning,Anshan,Liaoning 114051,China;School of Civil and Resources Engineering,University of Science and Technology Beijing,Beijing 100083,China;Hainan Mining Co.,Ltd.,Changjiang,Hainan 572700,China)

机构地区：[1]辽宁科技大学矿业工程学院,辽宁鞍山市114051 [2]北京科技大学土木与资源工程学院,北京100083 [3]海南矿业股份有限公司,海南昌江黎族自治县572700

出　　处：《矿业研究与开发》2024年第4期62-68,共7页Mining Research and Development

基　　金：国家自然科学基金项目(51774176)。

摘　　要：溜井是矿岩运输的重要工程,因卸矿冲击造成的井壁损伤是制约溜井使用年限的主要问题。为分析倾斜溜井内矿岩的运动过程,通过PFC2D数值模拟试验,结合物理相似试验验证,模拟倾斜溜井卸矿过程,分析倾斜溜井内矿岩运动形式及速度变化特征,研究溜井倾斜角度对矿岩运动规律及撞击井壁位置的影响,讨论垂直溜井与倾斜溜井中矿岩运动方式的差异性。研究发现,(1)当溜井倾斜角度为60°时,两次撞击位置高度分别距离卸矿口1.36 m、3.30 m,撞击速度分别为9.53 m/s、5.47 m/s,矿岩到达溜井底板时速度达到峰值16.17 m/s;矿岩运动过程可简化为5个阶段,在分支溜槽内做匀加速的滑动或滚动,脱离溜槽以一定初速度作斜抛运动,与井壁发生两次撞击,沿着井壁做匀加速的滑动或滚动运动,最后到达溜井底板。(2)溜井倾斜角度对矿岩运动过程的影响非常显著,随着溜井倾斜角度的增加,矿岩两次撞击井壁位置距离卸矿口高度呈增加趋势;倾斜角度超过60°后,第2次撞击位置距离卸矿口高度和撞击速度急剧增大。(3)与垂直溜井相比,倾斜溜井中矿岩运动过程受井壁边界限制作用更显著,落体运动时长较短,矿岩与井壁存在较长距离的相对接触、滑动过程,对井壁造成摩擦损伤。The orepass is an important project for ore-rock transportation.The damage of the sidewall caused by the unloading impact is the main problem that restricts the age limit of the orepass.In order to analyze the movement process of ore-rock in inclined orepass,PFC numerical simulation experiment and physical similarity experiment were used to simulate the unloading process of inclined orepass,analyze the movement form and velocity variation characteristics of ore-rock in inclined orepass,study the influence of inclined angle of orepass on the movement law of ore-rock and the position of impact sidewall,and discuss the difference of movement mode of ore-rock in vertical orepass and inclined orepass.The study findings are as follows.Firstly,when the inclined angle of orepass is 60°,the two impact heights of the ore-rock are 1.36 m and 3.30 m away from the unloading port,the impact velocity is 9.53 m/s and 5.47 m/s,respectively,and the peak speed of the ore-rock reaches 16.17 m/s when it reaches the orepass floor.The process of ore-rock movement can be simplified into five stages:uniform accelerated sliding or rolling in the branch orepass,oblique throwing movement at a certain initial speed away from the orepass,two impacts with the sidewall,uniform accelerated sliding or rolling movement along the sidewall,and finally reaching the bottom of the orepass.Secondly,the influence of the inclined angle of the orepass on the movement process of the ore-rock is very significant.As the inclined angle of orepass increases,the distance between the two impact positions of the ore-rock and the height of the unloading port increases.After the inclined angle exceeds 6o°,the distance between the position of the second impact and the height of the unloading port and the impact velocity increase sharply.Thirdly,compared with the vertical orepass,the movement process of the ore-rock in the inclined orepass is more significantly restricted by the boundary of the sidewall,and the falling body movement time is shorter.There is a relati

关 键 词：倾斜溜井 矿岩运动特征 溜井倾斜角度 数值模拟 

分 类 号：TD521.1[矿业工程—矿山机电]