针对综放大断面巷道顶板松软破碎易诱发岩层离层膨胀,进而导致锚索拉断和诱发冒顶事故的现象,以20322综放工作面区段运输平巷顶板掘进期间大面积垮冒为研究背景,采用理论分析、数值模拟等方法,对巷道冒顶前矿压现象分析.研究结果表明:顶板结构失稳的主要原因是地质体破碎和锚索参数不合理,并提出了通过调整锚索支护参数增强顶支护结构的完整性和抵抗强度来控制松软厚煤顶的支护理念,在工业性实践中取得了良好的效果.%According to the fact that the roof of large span roadway in thick coal was soft and broken and the separation of expansion was easily happened in this roof.These features can easily led to the broken of anchor ropes and the destruction of support structure,and caused the roof fall accident.The large area roof fall of No.20322 haulageway during roadway excavation was chosen as the research background.By the theory analysis and numerical modelling,the paper analysised the pressure phenomenon before the roadway roof-fall accident.The results indicated that the main reasons for the instability of the roof structure were the fractured surrounding rock and the unreasonable parameters of anchor cables.The supporting idea of enhance the integrity and strength of the roof support structure through the adjustment of the anchor cable supporting parameters to control the soft thick coal roof was proposed and good results have been achieved in the practice of the industry.
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