两侧采空巷道挤压变形机理与控制对策

Squeezing deformation mechanism and control technology of roadway between two goafs

为解决两侧采空巷道挤压大变形控制难题,以山西丰汇煤矿布置在两采空区之间的工作面轨道巷为工程背景,综合采用现场监测、理论计算和数值模拟等方法,分析巷道变形破坏特征,研究巷道覆岩结构特点与不同采动条件下围岩塑性区分布形态和应力环境,揭示两侧采空巷道挤压变形机理,并提出以“强化关键部位、注浆改性围岩”为核心的锚固加注浆联合支护方案。现场监测结果表明,新支护方案对两侧采空巷道挤压变形控制效果好,可为类似条件下巷道围岩稳定控制提供参考。

In order to solve the problem of large squeezing deformation control of roadway between two goafs,the panel track-roadway between two goafs in Fenghui coal mine is taken as the engineering background,and the methods of on-site monitoring,theoretical calculation and numerical simulation are comprehensively used.The deformation characteristics of the roadway,the characteristics of the overlying strata structure,the plastic failure modes and stress environment of the surrounding rock under different mining conditions are studied.The squeezing deformation mechanism of the roadway between two goafs is revealed.A combined support design of anchoring and grouting with“strengthening key parts and grouting modified surrounding rock”as the core is proposed.The on-site monitoring results show that the new support design has good control effect on the squeezing deformation of the roadway between two goafs,which can provide reference for the surrounding rock control under similar conditions.