急倾斜煤层深部煤岩动力失稳原因分析

为揭示大洪沟煤矿急倾斜特厚煤层发生动力失稳现象的原因,基于采掘布局特点对其进行理论分析和岩石力学试验,分析得出诱发急倾斜煤层深部煤岩体动力失稳的原因有:开采深度、顶底板夹持作用、顶底板破断、煤岩物理力学性质、应力集中。结果表明:底板的撬动作用是工作面煤层失稳的动力来源,该煤层具备发生动力失稳的条件,B3+6煤层工作面相向采掘导致掘进工作面与采煤工作面超前压力叠加,应力集中较为严重。应对该煤层及顶底板实施爆破卸压与注水弱化,来释放积聚在煤岩体中的弹性势能,并优化采掘布置。

Analysis on Cause of Deep Coal and Rock Dynamic Instability in Steep Inclined Seam

In order to reveal the cause of the dynamics stability lost phenomenon in the steep inclined ultra thick seam of Dahonggou Mine,based on the theoretical analysis and rock mechanics experiments of the conducted on the mining and excavation distribution features,the paper analyzed causes of the deep coal and rock dynamics instability in the steep inclined seam.The mining depth,the roof and floor holding function,roof and floor broken,coal and rock physical mechanics properties,stress concentration and other factors were included.The results showed that the prying role of the floor would be the dynamic sources of the seam instability and the seam had the condition to occur the dynamic.The B3+6 seam mining face cased the pilot pressure ovelying between the driving face and the coal mining face.The stress concentration was serious.The blasting pressure releasing and water injection weakening should be conductal in the seam and the roof and floor to release the elastic energy acsumulated in the coal and rock and to optimize the mining and excavation layout.