摘要
以某矿保护层开采为实例,根据C5、C12保护层与被保护层C8煤层的位置关系及巷道布置情况,提出了以残余瓦斯含量和钻屑指标K1值2个指标对保护范围进行考察。从最大保护垂距、走向、倾向3个方面对保护范围分析得出:走向卸压角为60°;C5对C8倾斜上下卸压角分别为70°和77°,C12对C8倾斜上下卸压角分别为69°和90°。运用FLAC3D软件对C12煤层留设的2#和12#上山煤柱影响范围进行模拟,模拟结果表明煤柱影响存在扩界效应。根据卸压角对煤柱扩界区域进行确定,在此基础上对1801和1802工作面进行区域划分。同时采取有效防突和效果检验措施,区域瓦斯抽放率达到了30%以上,预测及效检指标均不超限,实现了安全回采。
Taking the protective layer mining of a mine as an example, according to the coal seam position relation and roadway ar- rangement between the protective layer C5 ,C12 and the protected layer C8, it put forward two indicators of the residual gas content and drilling index K1 value to investigate the protection scope. Based on three aspects of maximum vertical protective distance, towards and inclination, it analyzed the protection scope, and concluded that the relief angle of towards was 60° ; C5 on the Cs tilt up and down pressure relief angle was 70 ° and 77 ° respectively, Ci2 on the C8 tilt up and down pressure relief angle was 69° and 90 ° respective- ly. By using the FLAC3D software to simulate No. 2 and No. 12 uphill pillar influence scope in the C12 coal seam, the simulation showed that the coal pillar impact had expanded field effect. According to the pressure relief angle, it determined the coal pillar extending bounded region. On this basis, it divided the region for 1801 and 1802 working face. At the same time, it took effective eliminating outburst and effect inspection measures, the gas discharge rate was more than 30% in this region, the prediction index and the effect test index were not overrun, eventually achieved safety mining in this region.
出处
《煤矿安全》
CAS
北大核心
2014年第1期211-214,共4页
Safety in Coal Mines
基金
贵州省科学技术基金资助项目(S2011JP00401451557)
贵州省科学技术基金资助项目(黔科合J字[2012]2010号)
贵州省科学技术联合基金资助项目(黔科合J字LKB[2012]03号)
关键词
保护层开采
保护范围考察
煤柱影响区域
消突范围划分
安全回采
protective layer mining
protection scope investigation
coal pillar effect area
eliminating outburst range partitioning
safe-ty mining
