22117回风巷围岩塑性区及松动破坏特征分析

Characteristic Analysis of Surrounding Rock Plastic Zone and Loosening Circle of 22117 Return Airway

本文以潞宁煤业22117回风巷为研究对象,通过数值模拟及现场钻孔窥视等手段对巷道围岩塑性区及松动破坏特征进行分析.结果显示:不同埋深条件以及不同煤柱宽度条件下,巷道围岩塑性区发育情况不同;巷道断面上帮围岩松动破坏范围较大,下帮较小,顶板完好.说明在22117回风巷掘进后,上区段22115采空区基本顶继续回转对巷道围岩变形影响较为严重,上帮锚杆(索)支护效果较差,需进一步优化锚杆(索)支护参数,同时下帮采用锚索支护,以确保巷道围岩的稳定性.

This paper takes Luning Coal Industry 22117 return air lane as the research object,through numerical simulation and on-site borehole peeping and other methods to analyze the plastic zone of the roadway surrounding rock and the characteristics of loose failure.Results show that under different burying depth conditions and different coal pillar width conditions,the development of plastic zone of the surrounding rock of the roadway is different;the surrounding rock of the roadway section is loose and the damage range is larger,the lower wall is small,and the roof is intact,indicating that in 22117 return air lane after being excavated,the continued rotation of the basic roof of the 22115 goaf in the upper section has a serious effect on the deformation of the surrounding rock of the roadway.The effect of the upper bolt(cable)support is poor.It is necessary to further optimize the support parameters of the bolt(cable)and support the anchor cable to ensure the stability of the surrounding rock of the roadway.