大倾角煤层组合覆岩结构力学特征及失稳判据研究

Study for Mechanical Characteristics and Instability Criterion of Composite Overlying Rock Structure in Large Dip Coal Seam Mining

针对大倾角煤层开采过程中顶板覆岩结构特征及应力演化,建立了组合岩体梁计算模型,分析了其受力荷载分布情况;提出顶板覆岩多层岩体梁截面几何特征的计算方法。相关煤矿巷道工程断面的实践应用表明评判结果与实际工况一致,证明模型构建科学合理,开拓了关于大倾角顶板覆岩失稳评判的新思路。

According to the structure characteristics of overlying strata of steeply dipping seam mining and the evolution of stress,a combination of rock beam analysis model and the analysis of the load distribution method is put forward to calculate the overlying roof rock beam multi geometrical feature. The practical application of coal mine roadway mining engineering section showed that the calculation results are consistent with the actual conditions,proved that the model is scientific and reasonable, develop a new idea of instability evaluation about inclined roof rock.