摘要
在近距离煤层群上行开采条件下,上部煤层开切眼外错回采时覆岩破坏规律有其自身特点。采用高精度微震监测技术和理论分析方法对龟兹煤矿A6-103工作面经过下部煤层采空区开切眼时覆岩破裂、运移规律进行研究。监测结果表明:井下微震事件波形分为5类;工作面经过下层采空区开切眼的过程中,微震事件的能量和频次分为"正常—加速破裂—破裂减少"的3个明显过程;通过对微震事件的空间定位分析得到裂隙带发育高度为采高的14倍。
Under upward mining of close distance coal seam group,upper strata damage rule has its own characteristics during the recovery of lower coal seam after open- off cut. High- precision microseismic monitoring technology and theoretical analysis method are applied to study the law of overlying strata fracture and migration in Qiuci A6-103 working face when passing the lower seam goaf open- off. The result shows that,underground microseismic event waveform is divided into five species; when working face passes the lower seam goaf,the energy of seismic events and frequency can be described as ＂normal- fast- bursts reduction＂. According to the analysis of spatial microseismic events distribution,fracture zone height is 14 times of mining height.
出处
《煤炭工程》
北大核心
2016年第7期82-85,共4页
Coal Engineering
基金
国家科技重大专项课题(2011ZX05040-002)
关键词
微震监测
波形分析
预警指标
上行开采
开切眼
microseismic
waveform analysis
early warning indicators
upward mining
open-off cut
