Zhaozhuang Coal Industry Co. ,Ltd. ,Shanxi Jinmei Group

为防控松软煤层大巷群在非对称应力作用下发生流变变形,以赵庄煤业三盘区大巷群受采动影响产生持续性变形为研究背景,提出了卸—注—锚协同防控围岩变形新技术。通过开展数值模拟和宽煤柱护巷顶板结构分析,阐明了大巷群应力状态与采空区顶板的关联性,揭示了爆破裂隙带在阻隔应力传递的作用机制,明确了回采巷道顶板爆破预裂和盘区大巷多层位预裂的理论依据,构建了深—浅孔联合卸压工艺和以锚固—注浆为核心的内外圈协同加固技术,根据理论推演和现场试验确定了爆破预裂参数和注浆参数。工程实践表明:爆破工艺实现了坚硬顶板的充分预裂,锚固—注浆工艺提升了巷道围岩的整体性,3312工作面回采后大巷群顶底板和两帮移近量较小,达到了卸—注—锚协同防控围岩变形的目的。

In order to prevent and control the rheological deformation of the main roadway group in soft coal seam under asymmetric stress,a new collaborative control technology of surrounding rock deformation by unloading-injection -anchoring in large roadway group in soft coal seam was proposed based on the research background of the sustained deformation caused by mining in the main roadway group of the Sanpan Distric of Zhaozhuang Coal Industry. By carrying out numerical simulation and analysis of roof structure of wide coal pillar protection roadway,the correlation between stress state of large roadway group and goaf roof was revealed,and the mechanism of blasting fissure belt in blocking stress transfer was clarified. The theoretical basis of blasting precracking of mining roadway roof and multi-layer precracking of main roadway in disk area was defined,and deep- shallow hole combined pressure relief technology and inner outer ring collaborative reinforcement technology with anchoring grouting as the core have been established. The parameters of blasting precracking and grouting were determined by theoretical deduction and field test. The engineering practice shows that the blastingg process has achieved sufficient precracking of the hard roof,and the anchoring-grouting process has improved the integrity of the surrounding rock of the roadway. After the mining of the working face,the roof and floor and two sides of the main roadway group are moved in a small amount,and the purpose of collaborative control of surrounding rock deformation by unloading-injection -anchoring was achieved.

范恺.松软煤层大巷群卸—注—锚协同防控围岩变形技术研究[J].矿业安全与环保,2024,51(5):76-82.

FAN Kai. Research on collaborative control technology of surrounding rock deformation by unloading-injection-anchoring in large roadway group in soft coal seam[J]. Mining Safety & Environmental Protection,2024,51(5):76-82.