孤岛综放工作面三角煤失稳机理及控制技术

Instability mechanism and control technology of triangle coal in isolated island fully mechanized top-coal caving face

针对王坡煤矿3210孤岛工作面回采过程三角区煤壁大面积垮塌等问题,通过理论分析、现场实测、工业试验等方法,分析了孤岛工作面超前支承应力影响范围和煤帮破坏深度,阐述了端头三角煤失稳破坏机理。为防治三角煤片帮、冒落采取合理注浆区域和注浆参数的选择提供依据,提出采用GRT-101化学注浆材料加固三角煤及其围岩,并在3210孤岛工作面进行工业性试验,取得了较好效果。

In view of the large area coal wall collapse in the triangle area during the mining of 3210 isolated island face in Wangpo Coal Mine,the influence range of the leading bearing stress and the failure depth of the coal wall are analyzed,field measurement and industrial test,and the failure mechanism of the triangle coal at the end is expounded.In order to provide a basis for the selection of reasonable grouting area and grouting parameters for the prevention and control of triangular coal caving,grt-101 chemical grouting material is used to reinforce the triangular coal and its surrounding rock.And industrial tests are carried out in 3210 isolated island working face,achieving favorable results.