两翼工作面采动影响下采区大巷围岩变形破坏特征

Deformation and Failure Characteristics of Roadway in Mining Area under the Condition of Double Wing Mining

与单翼采区相比,两翼工作面开采能提高煤炭资源开采效率和巷道利用率,然而两翼工作面先后回采对采区大巷具有多次采动影响,易导致采区大巷围岩变形加剧,甚至破裂。本文通过数值模拟、理论分析和现场实测等方法,研究了内蒙古利民煤矿I0309采区大巷在两翼工作面顺序采动影响下的应力分布及变化特征,分析了采区大巷围岩大变形机理,确定了I030901工作面停采线合理位置,研究结果对两翼工作面开采采区大巷的稳定维护具有重要的参考价值。

Compared with single wing mining area, the mining of double-wing working faces can improve the mining efficiency of coal resources and the utilization rate of roadways. However, the successive mining of the double-wing working faces has multiple mining impacts on the main roadway in the mining area, which is easy to cause the deformation of the surrounding rock of the main roadway in the mining area to intensify, or even crack. In this paper, by means of numerical simulation, theoretical analysis and site measurement, the stress distribution and variation characteristics of the main roadway in the I0309 mining area of Limin Coal Mine in Inner Mongolia under the influence of sequential mining in the double-wing working faces are studied. The large deformation mechanism of surrounding rock of main roadway in mining area is analyzed. The reasonable position of stop-mining line in I030901 working face was determined. The research results have important reference value for the stability maintenance of the main roadway in the open mining area of the double-wing working faces.