短壁充填巷道宽高比对围岩稳定性的影响研究
Influence of Width to Height Ratio on Surrounding Rock Stability for Short Wall Backfillling Rodway
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摘要: 为了研究短壁充填巷道断面宽高比对围岩稳定性的影响规律,采用理论分析和数值模拟的方法,分析了短壁充填巷道协同控顶原理,得到了不同宽高比条件下围岩稳定性的变化规律。研究结果表明:当巷道高度固定时,顶底板和两帮最大移近量随宽高比的增加先缓慢增加然后略有减小,在宽高比大于1.0后又快速增加;且在巷道宽高比为1.0时,单位面积的巷道变形量最小,最有利于巷道围岩的稳定;结合百良旭升煤矿具体开采条件确定了短壁充填巷道的合理宽高比为1.0,并根据非对称性的变形特征给出了具体的支护方案。Abstract: In order to study the influence of the aspect ratio of the short-wall filling roadway on the stability of surrounding rock, the theory of numerical analysis and numerical simulation were used to analyze the principle of cooperative roof control of the short-wall filling roadway. The change laws of the stability of surrounding rock under different aspect ratios are presented.Research indicates that: when the height of the roadway is fixed, the maximum approach of the top floor and the two sides increases slowly with the increase of the width to height ratio and then decreases slightly, and then increases rapidly after the width to height ratio is greater than 1.0. And when the width to height ratio of the roadway is 1.0, the deformation of the panel per unit area is the smallest, which is most beneficial to the stability of the surrounding rock of the panel. Combined with the specific conditions of Bailiang Xusheng Coal Mine, the reasonable width-to-height ratio of the short-wall filling roadway was determined to be 1.0, and a specific support scheme was given based on the asymmetric deformation characteristics of the roof.
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