孤岛煤柱内采动作用下大巷围岩变形机理与控制技术

针对王庄煤矿孤岛煤柱内630运输大巷围岩变形量大、维护难度大的问题,着重分析了工作面动压、孤岛煤柱宽度、巷道支护技术等因素对围岩稳定性的影响,揭示了孤岛煤柱内支承应力呈“前期高强高速扩张、中期稳势缓慢增压、后期持续高强作用”的演化规律,阐明了该类巷道具有来压不均匀、采动帮塑性区向深部扩展诱发顶板失稳的特征.提出了壁后充填碹体增大围岩径向约束力、浅部注浆限制深部围岩位移、锚杆支护调动围岩自承能力的控制技术.现场观测结果表明,630运输大巷经历两侧采空影响后,最大表面位移约64 mm,控制效果良好.

The surrounding rock deformation mechanism and control technology of roadway in isolated coal pillar affected by mining

For the problems of the big deformation of surrounding rock and hard maintenance of 630 belt roadway in isolated coal pillar in Wangzhuang Coal Mine,it analyzed the impacts on the surrounding rock stability by the working face dynamic pressure,on the isolated pillar width and on the roadway support technology,etc.,it revealed the evolutional rule of bearing stress in isolated coal pillar:' high-strength and high-speed expansion in early period,and the slow pressurization in medium-term and continued high st...