综放仰斜开采煤壁稳定性及注浆加固技术

Coal wall stability and grouting reinforcement technique in fully mechanized caving face during topple mining

探讨了厚煤层煤壁破坏的机理,结合瑞隆矿8101综放工作面煤壁的主要破坏形式,建立了综放仰采工作面煤壁破坏的力学模型,并对影响煤壁稳定性的因素进行了敏感性分析。研究结果表明:采高、埋深、仰采角度、煤体强度、支架支护强度等对煤壁稳定性影响较大,其中降低采高和提高支护强度、煤壁注浆加固是防治煤壁片帮的有效措施。采用UDEC数值模拟研究了注浆加固煤壁的合理注浆孔径,得出该矿开采条件下棕绳直径为15 mm时注浆效果最佳。

Probed into the general mechanism of the coal wall failure in thick coal seam, combined with the main failure form of coal wall in 8101 mining face of Ruilong mine, the mechanical model of rib spalling during the topple mining was established, and the sensitivity analysis was also implemented to study the factors influencing the coal wall stability. The results show that the mining height, confining pressure, support strength, angle of topple mining, strength of coal, etc., have a great influence on the stability of coal wall, and reducing the mining height, improving the support strength, and grouting reinforcement of coal wall are the most effective measures to prevent the rib spalling of coal wall. The reasonable drilling diameter of grouting reinforcement was further studied through theoretical analysis and UDEC numerical modeling. As a result, the grouting effect with 15 mm in borehole diameter is the best to control rib spalling of coal wall.