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层位组合和物理力学性质是锚杆支护煤巷顶板稳定性的重要影响因素,顶板锚固孔钻进装置对于不同岩石类型具有不同的动力响应,可间接反应岩层的厚度与强度。因此,为克服煤巷顶板岩层状况的隐蔽性问题,合理设计锚杆支护参数,防止出现冒顶问题,对较易发生冒顶事故的煤巷顶板岩石类型进行钻进特性数值试验,研究结果表明:煤巷顶板岩石钻进过程是不连续的,锚固孔的形成是“跳跃式”的;在岩石为均质条件下,钻进速度关系为:砂质泥岩>粉砂岩>泥岩>砂岩,钻头所受阻力关系为:粉砂岩>砂岩>泥岩>砂质泥岩。以上指标在钻进锚固孔过程中利用相关仪器进行监测,对于判别煤巷顶板锚固孔范围内岩石类型及厚度具有重要意义。
The layer combination and the physical and mechanical properties are the important factors that influence the roof stability of coal seam gateway. The roof anchor drilling device has different dynamic response to different rock types and can indirectly reflect the thickness and strength of the rock formation. Therefore, in order to overcome the concealment problem of coal seam roof and rock strata condition, reasonably design the parameters of bolt support, prevent the occurrence of roof fall problem, carry on the numerical test of the drilling characteristics of coal roof rock of the prone roof accident. The results show that: The rock drilling process is discontinuous in coal seam roof, the formation of anchor hole is “leaping”; under the condition of homogeneous rock, the drilling speed is related to sandy mudstone> siltstone> mudstone> sandstone, Drill bit resistance relations as follows: siltstone> sandstone> mudstone> sandy mudstone. The above indicators in the process of drilling into the anchor hole using the relevant instruments for monitoring, to determine the coal seam rock bolt roof anchor hole type and thickness of great significance.