崩落矿岩流动特性及影响因素实验研究  

Experimental Study of the Factors Affecting the Ore Flow Mechanism During Block Caving

作　　者：王洪江[1] 尹升华[1] 吴爱祥[1] 沈慧明[1] 

机构地区：[1]北京科技大学土木与环境工程学院,北京100083

出　　处：《中国矿业大学学报》2010年第5期693-698,715,共7页Journal of China University of Mining & Technology

基　　金：国家自然科学基金项目(50934002;50774011);"十一五"国家科技支撑计划(2006BAB02A01);教育部高等学校博士学科点专项科研基金项目(20070008038;20060533078)

摘　　要：采用1:100的相似比进行放矿物理模拟实验,将矿样破碎后按粒级组成分为Ⅰ和Ⅱ这2组矿样,进行了模拟放矿实验,通过拟合得到了放矿高度为55,95,145m时的放出椭球体;大块含量高的粒级组成Ⅱ放出体短半轴比粒级组成Ⅰ大20%,但大块含量的增加导致放矿卡斗堵塞频率增大,粒级组成Ⅱ的堵塞频率为Ⅰ的7倍;此外,矿岩孔隙当量直径越大,细小颗粒穿流现象越明显,细粒含量较多的覆盖层能使矿石贫化率提高3倍以上,含水量也是影响崩落矿岩流动性的重要因素,含水率在10%左右的矿岩抗剪强度较大.Physical simulations at a scale of 1∶100 were conducted to determine the factors affecting ore flow during block caving.An ore sample obtained from a mining site was crushed and divided into fractions by size.Draw ellipsoids were found from the experimental results by fitting data from trials at draw-heights of 66,96 and 145 meters.The shorter axis of the second group drawing body was 20% larger than for group one,due to the higher content of larger particles.The ore-blocking frequency increases with an increase in large sized ore particles.The blocking frequency of a third group was seven times that of the first group.A preferential flow of smaller particles was observed when the equivalent diameter of the ore-pores was large.Dilution increased by a factor of three when the fine-particle content in the covering material was high.Water content had an important affect on the ability of the ore granules to flow.The shear strength of the ore was slightly higher when the water content was 10%.

关 键 词：崩落矿岩 流动特性 细颗粒 覆盖层 含水量 

分 类 号：TD32[矿业工程—矿井建设]