大断面巷道非均匀变形规律及稳定性控制

Non-uniform Deformation Law and Stability Control of Large Section Roadway

为探究受采动影响下的大断面巷道围岩变形规律与稳定性控制,以某矿9103运输巷为背景,采用现场观察及数值模拟方法分析“一掘一采”期间大断面巷道的围岩应力、塑性区、位移分布特征,并结合现场提出了补强支护方案。结果表明:该类大断面巷道围岩垂直应力分布呈明显的非对称性,巷道距离相邻工作面越近,煤柱帮塑性区域越大,工作面离巷道距离越近,巷道围岩位移量越大。通过对巷道肩角及煤柱帮进行针对性加强支护后,巷道围岩变形情况能够保证工作面的安全回采。

In order to explore the deformation law and stability control of surrounding rock of large section roadway under the influence of mining, taking 9103 transportation roadway of a mine as the background, the field observation and numerical simulation methods are used to analyze the distribution characteristics of surrounding rock stress, plastic zone and displacement of large section roadway during "one excavation and one mining", and the reinforcement and support scheme is put forward in combination with the field. The results show that the vertical stress distribution of surrounding rock of this kind of large section roadway is obviously asymmetric. The closer the roadway is to the adjacent working face, the larger the plastic area of coal pillar wall, the closer the working face is to the roadway, and the greater the displacement of surrounding rock of the roadway. After strengthening the targeted support of roadway shoulder angle and coal pillar wall, the deformation of roadway surrounding rock can ensure the safe mining of the working face.