区段煤柱对沿空巷道动力显现影响机制研究

Study on influence mechanism of width of sectional coal pillar on rockburst of gob-side roadway

为了探究不同宽度区段煤柱对沿空巷道动力显现影响的机制,结合鄂尔多斯中深部矿井不同宽度区段煤柱冲击地压工作面实测数据,从覆岩破裂与采动应力场关联性角度进行了研究。研究结果表明:煤层上覆坚硬砂岩组破断时释放的动载荷耦合集中静载荷区弹性应变能是为沿空巷道近距离超前段频繁动力显现的主要原因;采用较小区段煤柱有利于避免沿空巷道集中动载荷与高静载区域重合,从而降低沿空巷道动静载叠加诱冲风险;小煤柱工作面邻空巷巷道围岩变形相对更为超前,现场应重视小煤柱工作面沿空巷道超前支护距离及正帮侧的卸压工作。

In order to explore the influence mechanism of coal pillar in different width section on dynamic behavior of gob-side roadway,in this paper,the relationship between overburden fracture and mining stress field is studied combined with the measured data of middle-deep mine in Ordos rock burst working face in different width section.This study shows that the dynamic load and the concentrated static load released when the hard overlying strata broken are the main reasons for the frequent dynamic behavior of the roadway,the coincidence of concentrated dynamic loading and high static loading in gob-side roadway can avoid by using smaller sections of coal pillars,therefore,the risk of dynamic and static load induced impulsive is reduced.The deformation of surrounding rock in gob-side roadway is more advanced in small coal pillar working face,advance support distance of gob-side entry in small coal pillar working face and pressure relief on the positive side of gob-side entry should be taken seriously.