煤岩倾角对回采巷道顶板稳定性影响机理研究

Study on the influence mechanism of coal and rock angle on stability of roof roadway

为了解决倾斜煤层回采巷道顶板围岩稳定性控制问题,采用摩尔-库伦岩石强度准则,建立了走向倾斜和倾向倾斜巷道顶板力学模型,对两类倾斜巷道顶板失稳机理进行深入分析,得出了倾斜巷道顶板非对称冒落分布规律,结果显示倾斜巷道上端部更容易冒落且冒落高度更大,进而计算得到了顶板上、下端部冒落角,确定了回采巷道顶板支护控制范围,为庞庞塔倾斜煤层巷道工程实践提供了有益的理论指导,根据重点部位重点控制的原则调整优化了巷道顶板及上帮支护参数,取得了较好的技术效果。

In order to solve the inclined roof coal roadway surrounding rock stability control problems, based on Mohr Kulun rock strength criterion, the mechanical model for roof of inclined and inclined roadway is established, the two kinds of inclined roadway roof instability mechanism are carried out in-depth analysis, the asymmetric caving distribution law of inclined roadway roof is obtained, the results show that the upper end of the inclined roadway more easily falling and falling height greater, then calculate the upper and lower ends of roof caving angle, the roof support control range of the gateway is determined, which provides a useful theoretical guidance for the engineering practice of inclined coal seam roadway,according to the focus on the control of key parts of the principle of the adjustment and optimization of roadway roof and timbering parameters, which have good technique effect.