近浅埋煤层大采高工作面矿压显现规律研究

    Research on Strata Behavior Characteristics of Nearly Shallow-buried Coal Seam with Large Mining Height

    • 摘要: 为掌握榆神矿区近浅埋煤层大采高工作面矿压显现规律,选取区内某矿N1200大采高综采工作面为研究对象,开展了相似材料物理模型实验研究及现场实测分析。研究表明,N1200工作面初次来压步距为56 m,周期来压步距平均为15.8 m,支架平均工作阻力4 843 kN,动载系数最大1.95,支架工作阻力达到9 739 kN即可满足现场需求;由于受到上覆双关键层叠合破断的影响,工作面呈现大小周期来压现象,小周期来压时岩层垮落角以主关键层为界呈上大下小分布,大周期来压时动载系数及超前支承压力峰值均增大。

       

      Abstract: In order to master the law of strata pressure behavior of large mining height working face in nearly shallow buried coal seam of Yushen Coal Mining Area, N1200 fully mechanized longwall mining face in the mining area is chosen as the research object, and physical model experiment of similar material is carried out. The results show that the initial working pressure of N1200 face is 56 m, the average step pressure is 15.8 m, the working resistance is 4 843 kN, the dynamic load factor is 1.95, and the resistance of support reaches 9 739 kN. Due to the influence of double-critical laminated damage, the working face presents large and small periodic pressure phenomenon. When the pressure is in small cycle, the collapse angle of rock is mainly distributed on the main key stratum. When the pressure is in big cycle, the coefficient and the peak value of the advancing bearing pressure are increased.

       

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