摘要
针对海天煤业3#煤部分区域存在蹬空开采问题,首先采用了“三带”判别法、围岩平衡法等理论方法论证了3#煤蹬空开采可行性。又通过钻孔分段注水、钻孔窥视等现场实测方法以及FLAC3D数值模拟手段研究了下覆煤层开采后3#煤层及覆岩变形演化特征。综合理论分析、现场实测及数值模拟结果得出了在下覆煤层开采结束后,3#煤层及其顶板岩层并未发生剧烈程度的破坏,只是出现煤岩体的内部损伤,未出现影响3#煤正常开采的台阶下沉。实测冒落带高度距9#煤顶板2~4m,裂隙带高度距9#煤顶板19~27m,均小于理论计算最大值,3#煤处于9#及15#煤的弯曲下沉带内,最终得出3#煤蹬空开采可行。
Aiming at the problems of mining above hollow in 3＂ coal seam of Haitian coal mine, ＂three-zone＂ criterion method, surrounding rock equilibrium method are used to demonstrate the mining feasibility. Subsection water injection, drilling peep and FLAC3D numerical simulation method are used to research the deformation characteristics of 3#coal seam and overburden after overlying coal seam mining. The results show that, internal damage occurs in coal and rock mass of the 3# coal seam and roof rock strata without severe destruction, which presents sidestep sinks which affects the normal mining of 3# coal. The height of caving zone is 2-4m above the roof of 9# coal seam, and the height of the fracture zone is 19-27m, which is less than the theoretical calculation. The 3# coal is in the curve subsidence zone of the 9# and 15# coal. The results show that mining above hollow is feasible.
出处
《煤炭工程》
北大核心
2016年第8期57-60,共4页
Coal Engineering
基金
国家自然基金资助项目(51274088
50804013)
河南省骨干教师基金资助项目(2011GGJS-057)
关键词
岩层移动
蹬空开采
“三带”高度
台阶下沉
multiple seam
mining above hollow
＂three-zone＂ method
feasibility
