基于孔间延时优化的骨料用石灰岩爆破粉矿率控制  

Rock Fragmentation Distribution Control of Limestone Blasting for Aggregate based on Optimization of Delay Time between Blasting Holes

作　　者：叶海旺[1,2] 王皓永 雷涛 陈东方[1,2] 李宁 王其洲 YE Hai-wang;WANG Hao-yong;LEI Tao;CHEN Dong-fang;LI Ning;WANG Qizhou(School of Resources and Environment Engineering,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Mineral Resources Processing and Environment,Wuhan 430070,China)

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]矿物资源加工与环境湖北省重点实验室,武汉430070

出　　处：《爆破》2019年第4期43-48,68,共7页Blasting

基　　金：贵州省科技计划项目(20172803);中央高校基本科研业务费专项资金资助(2017-zy-071、2018-zy-81、2018-zy-85)

摘　　要：针对某骨料矿山爆破粉矿率偏高的问题,依据现场工况参数,分别以孔间延期时间为0 ms、25 ms、50 ms、75 ms、110 ms开展爆破试验研究。首先,采用ANSYS/LS-DYNA有限元软件进行数值模拟试验,获取不同孔间延时条件下应力场分布特点和振动速度值,初步获取相对较优的孔间延期时间;再基于数值模拟实验结果,开展现场试验。结果表明:采用延期时间为75 ms时的效果最佳,可以使平均粉矿率下降至7.43%、平均块度尺寸d50提高至26.5 mm、d80块度尺寸提高至37.5 mm、不均匀指数Cu减小至3.31、曲率系数Cc增大至1.206。Aiming at the problem of high blasting powder rate in an limestone mine,blasting test studies were carried out with the inter-hole delay times of 0 ms,25 ms,50 ms,75 ms and 110 ms respectively according to the field working condition parameters.Firstly,ANSYS/LS-DYNA finite element software was used to conduct numerical simulation tests to obtain the distribution characteristics of the stress field and the values of vibration velocity under different inter-hole delay conditions,and the relatively optimal inter-hole delay time was preliminarily obtained.Based on the results of numerical simulation,the field test was carried out.The results show that the best effect is achieved when the delay time is 75 ms,which can reduce the average fines rate to 7.43%,increase the average lumpiness size d50 to 26.5 mm,increase the average lumpiness size d80 to 37.5 mm,reduce the non-uniformity index Cu to 3.31,and increase the curvature coefficient Cc to 1.206.

关 键 词：骨料矿山 粉矿率 数值模拟 

分 类 号：TD235[矿业工程—矿井建设]