发耳矿首采层开采顶板“两带”发育规律分析

Analysis of the Development Law of the"Two Belts"in the Top Plate of the First Mining Layer in Fa Er Mine

煤层回采过程中,顶板上覆岩层在自重影响下发生断裂下沉并形成"三带"。通过对顶板"两带"发育规律研究,将为高位钻孔瓦斯抽采、顶板治理提供理论依据。根据发耳矿五采区1#煤层的现场情况,通过数值模拟、理论分析、摄像观测等研究方法,确定发耳矿1#煤首采层冒落带高度为15m,裂缝带高度为51m,开采后上覆岩层较长时间内处于动态下沉状态。研究成果对较软煤系地层上覆岩层移动有新的认识。

In the process of Mining,the top plate overburden fractures and sinks under the influence of self-gravity and forms"three belts".The study of the development law of"two belts"of the roof plate will provide the theoretical basis for high level drilling gas extraction and roof plate management.According to the field situation of the No.1 coal seam in the five mining areas of the Faer mine,through numerical simulation,theoretical analysis,camera observation and other research methods,it is determined that The height of the first rise-down zone of the 1#coal mine is 15 m and the height of the crack zone is 51 m,and the overlying rock layer will be in a long time after mining.Dynamic subsidence state.The research results provide new insights into the movement of the overlying rock strata in the softer coal system.