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浅埋极近距离采空区下工作面矿压显现规律研究

Study on law of strata behavior in shallow-buried working face under contiguous gobs

  • 摘要: 针对同一浅埋工作面同时存在极近距离采空区下和实体煤岩下的具体工程条件,运用理论分析和现场实测方法研究了极近距离采空区下工作面矿压显现特征,并与相同地质条件单一工作面矿压显现规律进行了对比分析。研究结果表明:在上覆已破断关键层形成的平衡“砌体梁”结构与下煤层距离较近情况下,工作面覆岩更易失稳,来压频繁且来压强度较高;相对于实体煤岩下,采空下工作面来压步距均值变小,降幅平均为19%,且在走向方向上变化幅度较大,没有明显的规律性和周期性,来压强度整体增大,增幅平均为6%,而动载系数又有所降低;采空区下工作面较实体煤岩下超前影响范围增大,支承压力峰值点距工作面距离基本不变,峰值强度和深处稳定煤体应力值均明显降低。采空下工作面回采过程中应加强顶板管理和矿压观测,及时采取相应措施,确保安全生产。

     

    Abstract: For the same shallow buried working face, there are specific engineering conditions in the gob under the close distance and solid coal rock. The theoretical analysis and field measurement method were used to study the characteristics of the mining pressure under the working face in the very close distance gob. The geological conditions of single working face mining pressure behavior law were compared and analyzed. The results show that under the condition that the equilibrium "masonry beam" structure formed by the overburdened key layer is close to the lower coal seam, the overburden of the working face is more unstable, the pressure is frequent and the pressure strength is higher; Under solid coal and rock, the mean value of the pressure step distance is smaller, the average amplitude of reduction is 19%, and the variation in the direction of the strike is large. There is no obvious regularity and periodicity, and the overall pressure strength increases. The average increase is 6%, and the dynamic load coefficient is reduced. The working area under the gob is more affected than under solid coal rock. The distance between the peak of the supporting pressure and the working surface is nearly the same. The distance between the peak of the supporting pressure and the working surface is basically constant, and the peak strength and the stress value of the stable coal in the deep are obviously reduced. Roof management and mine pressure observation should be strengthened during the mining of the working face under the gob, and corresponding measures should be taken in time to ensure safe production.

     

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