特厚煤层综放开采顶煤放出率影响因素分析  

Influence Factors of Top-coal Caving Ratio in Full-mechanized Caving Mining Extremely-thick Coal-seam

作　　者：许力峰[1] 张勇[1] 李立[1] 张保[1] 李俊峰[1] 李宗超[1] 

机构地区：[1]中国矿业大学(北京)资源与安全工程学院,北京100083

出　　处：《煤矿开采》2012年第6期25-28,45,共5页Coal Mining Technology

基　　金：中央高校基本科研业务费资助项目(2011YZ05)

摘　　要：采用PFC2D模拟软件对山西兴县金地煤矿特厚煤层低位综放开采散体顶煤在不同采高下的冒落规律进行模拟,并通过理论分析研究特厚煤层低位综放开采顶煤放出率的影响因素。研究结果表明:随着采高的增加,顶煤放出率呈下降趋势;分析了支架掩护梁倾角对其影响,同时通过监测煤矸放出过程中的速度-时间曲线及煤矸成拱次数,得出该矿首采综放工作面选取3m为合适采高,以达到较高的顶煤放出率和开采效率。在实际生产中工作面采高为3m,采放比约为1∶3,采煤机截深0.8m,两刀一放,观测期间工作面取得了较高的顶煤回收率,故该方案可以在该工作面及相似条件下工作面推广采用。With PFC2D software, this paper simulated top-coal caving rule in full-mechanized caving mining extremely thick coal-seam in Jindi Colliery, Xingxian, Shanxi Province, and analyzed influence factors of top-coal caving ratio. Results showed that with mining height added, top-coal caving ratio reduced. The influence of shield dip of powered support on caving ratio was analyzed. 3m was thought as rational mining height to reach higher top-coal caving ration and mining efficiency by monitoring speed-time curve and archform frequency during coal and waste caving procedure. In actual mining, mining parameters including mining height was 3m, ratio of mining and caving was 1 ： 3, coal cutter web was 0. 8m, mining two and caving one obtained higher top-coal recovery, which showed these parameters could be adopted in this mining face and those with similar conditions.

关 键 词：特厚煤层 放顶煤 放出率 PFC 2D数值模拟 

分 类 号：TD823.49[矿业工程—煤矿开采]