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针对郑州矿区煤层赋存条件,从煤层结构、覆岩序列和支护特性3个方面阐述了滑动构造区厚煤层巷道的变形破坏机制。在此基础上,通过建立力学模型,研究了构造厚煤层中锚固结构形成的力学条件。并根据超化煤矿22031工作面地质采矿条件,通过实测端锚锚杆的锚固长度,在确定顶、帮锚固结构厚度的基础上,计算得到形成顶、帮锚固结构所需施加的锚杆预紧力分别为45.7 k N和44.0 k N。观测数据表明,回采巷道服务期间顶底板移近量约330 mm,两帮移近量约270 mm,巷道围岩变形得到有效控制。
According to the occurrence conditions of coal seam in Zhengzhou mining area, the deformation and failure mechanism of thick seam roadway in sliding structure area is described from three aspects of coal seam structure, overlying strata sequence and supporting characteristics. Based on this, the mechanics conditions of the formation of the anchorage structure in the thick seam are studied through the establishment of the mechanics model. According to the geologic mining conditions of 22031 working face in Chaohua Coal Mine, the bolt pre-tightening required to form the top and the bottom of the anchoring structure is calculated by measuring the anchorage length of the anchor bolt. The forces are 45.7 kN and 44.0 kN, respectively. The observation data show that during the service of mining gateway, the displacement of top and bottom floor is about 330 mm, the two approaches move about 270 mm, and the surrounding rock deformation of the roadway is effectively controlled.