论文部分内容阅读
杨庄煤矿45210工作面埋深大,顶板为复合顶板,受火成岩侵蚀,易发生突然冒顶等灾害。笔者采用数值模拟和现场观测分析方法,认为该巷道变形破坏机制为:因火成岩侵袭复合顶板倾斜煤巷,顶板煤岩层粘聚力和抗拉强度降低;巷道开挖卸荷后,在竖向应力作用下,顶板受拉破坏严重,顶板下沉量增加,引起煤帮受拉破坏,两帮移近量增加;集中应力区由巷道围岩表面向围岩深部不断转移,围岩塑性区由巷道表面向深处逐渐扩张,最终导致巷道的变形和破坏;提出了“强顶、固帮”的支护对策。现场试验表明,与原设计方案相比,新设计方案可有效控制巷道围岩变形,降低巷道变形量达50%以上,取得了良好的支护效果。
Yangzhuang Coal Mine 45210 face burial depth, the roof is a composite roof, by igneous rock erosion, prone to sudden fall and other disasters. By means of numerical simulation and on-site observation and analysis, the authors believe that the deformation and failure mechanism of the roadway is that the cohesion and the tensile strength of coal rock layers in the roof decrease due to igneous rocks invaded the sloping coal roadway. When the roadway is unloaded, Under the action, the roof is severely damaged by the roof and the roof subsidence is increased, causing the coal ganglion to be pulled and destroyed, and the amount of the two gangs moved closer to each other. The concentrated stress area is continuously transferred from the surface of the surrounding rock to the deep part of the surrounding rock. The surface gradually expands to the depth, eventually leading to the deformation and destruction of the roadway; and puts forward the support measures of “strong top and solid support”. Field tests show that compared with the original design scheme, the new design scheme can effectively control the deformation of roadway surrounding rock and reduce the deformation of the roadway by more than 50%, and achieved good supporting effect.