高承压野青工作面矿压显现与水压力变化关系研究

Study on the relationship between mineral pressure manifestation and water pressure variation at high pressure-bearing Yeqing working face

九龙矿15449S综采工作面位于矿井北五采区,该区域开采条件复杂,该采面与普通采煤工作面采动应力的主要差别是顶板,因坚硬顶板不易破断,周期来压强烈,且处于高承压水上,采动应力变化规律不明显。工作面在开采过程中来压时间间隔最小3 d,最大36 d;来压步距间隔最小2.85 m,最大17.4 m。来压时间和步距不规律,难以准确预测。通过分析15449S工作面回采期间,工作面山伏青观测孔水位及矿压之间的关系,找出矿压与水压之间的变化规律,为今后野青工作面顶板来压预警和安全回采提供了成功经验。

The 15449S comprehensive mining face of Jiulong Mine is located in the north five mining area of the mine,the mining conditions in this area were complex,the main difference between the mining stress of this face and the ordinary coal mining face was the roof,because the hard roof was not easy to break,the cycle pressure was strong,and it was on high bearing water,the mining stress change pattern was not obvious.The minimum pressure time interval was 3 d and the maximum was 36 d,and the minimum pressure step interval was 2.85 m and the maximum was 17.4 m.The pressure time and step interval were irregular and difficult to predict accurately.By analyzing the relationship between the water level and mineral pressure in the observation hole of the working face during the recovery period of 15449S working face,the changing law between mineral pressure and water pressure was found out,which provided successful experience for the early warning of incoming pressure and safe recovery of the roof of the working face in the future.