露天煤矿抛掷爆破有效抛掷率预测模型  

Prediction Mode of Effective Stripping Ratio of Casting Blast in Open Pit

作　　者：周伟[1] 才庆祥[1] 李克民[1] 

机构地区：[1]中国矿业大学矿业工程学院,江苏徐州221116

出　　处：《采矿与安全工程学报》2011年第4期614-617,622,共5页Journal of Mining & Safety Engineering

基　　金：国家"十一五"科技支撑计划项目(2006BAB16B00);国家自然科学基金重点项目(51034005);博士点基金项目(20100095110019);煤炭资源与安全开采国家重点实验室自主研究课题项目(SKLCRSM10X01);中央高校基本科研业务费专项资金项目(2010QNA33;2011QNA13;2010ZDP01A02);江苏高校优势学科建设工程项目

摘　　要：根据露天煤矿抛掷爆破中有效抛掷率的定义,基于弹道理论和露天采矿学基本原理,提出了有效抛掷的判断准则,给出了有效抛掷部分断面积计算方法,建立了有效抛掷率离散模型和抛掷速度反演模型,通过扫描爆破前后倒堆台阶,对露天煤矿抛掷爆破有效抛掷率进行了有效预测.结果表明:流场抛掷爆破速度理论得出的坡顶速度与反演速度一致,坡顶速度近似于有效抛掷区域的抛掷速度,预测有效抛掷率的误差在5%以内,验证了模型的有效性.In this paper, in light of the definition of the effective stripping ratio in the progress of surface coal mining, based on the ballistics theory and surface mining theory, we put forward the judgment criteria of effective casting, presented the calculation method for basal area of the effective stripping area, and built discrete model of effective stripping ratio and inversion model of casting velocity. Through scanning the stripping bench before and after blasting, the effective stripping ratio was predicted correctly in open pit. The results show that the inversion velocity is uniform well with the velocity of slope top, which is obtained by the theory of casting blast velocity in flow field, and the velocity of slope top is also similar with the casting velocity in the effective stripping area. The error of the predicted casting velocity is less than 5%, which verifies the effectiveness of the model.

关 键 词：露天煤矿 抛掷爆破 有效抛掷率 有限元模型 反演模型 

分 类 号：TD824[矿业工程—煤矿开采]