煤矿登空边角煤围岩应力变化勘查研究

Exploration and research on stress change of surrounding rock in mine boundary coal

煤矿登空边角煤的安全采出是矿井面临的重大问题。乌兰木伦煤矿1-2号煤四盘区东翼遗留有边角煤,3-1号煤31410工作面已采过此区域,使1-2号煤的边角煤已形成“登空煤”,现拟回收开采该区域1-2号煤的边角煤。需经勘查查明3-1号煤工作面回采后1-2号煤及围岩破坏程度,为边角煤上行开采方案提供地质依据。勘查工程共完成地面钻孔3个,钻探进尺431.70 m,查清了本区1-2号煤的分布情况及厚度变化规律,并采用钻孔钻井液漏失量观测、钻孔孔内电视录像观察以及钻探特殊情况观察记录等手段综合分析了本区“两带”发育高度,对3-1号煤开采后1-2号煤围岩的破坏程度进行了分析,为边角煤的开采提供了可靠的地质依据。

In Wulanmulun coal mine,there is corner coal left in the east wing of the fourth panel area of 1-2 coal seam,and the 31410 working face of 3-1 coal seam in the lower part has been mined,so that the corner coal of 1-2 coal seam has formed“above-goaf coal”,and its safe mining is a main problem faced by the mine.In order to find out the damage degree of 1-2 coal seam and surrounding rock after mined of 3-1 coal seam,the distribution and thickness variation law of 1-2 coal seam in this area were found out by drilling 3 boreholes on the surface with a total footage of 431.70 m.By means of drilling fluid leakage observation,borehole video observation and drilling observation record,the development height of“two zones”in this area is explored,and the damage degree of 1-2 coal surrounding rock after 3-1 coal mining is analyzed,which provides a reliable geological basis for the mining of corner coal.