浅埋含煤复合顶板切顶卸压岩石碎胀规律研究

Study on Rock Bulking Rule of Roof-cutting Distress in Shallow Buried Coal Composite Roof

通过对某工作面测点现场垮落情况进行实时观察并测量,最终采用110工法顶板泥岩碎胀系数确定法求得顶板泥岩碎胀系数。结果表明:随着工作面推进,顶板泥岩不断垮落,得到顶板泥岩初始碎胀系数,顶板垮落后逐渐被压实,碎胀系数也随之逐渐减小,且其减小变化逐渐趋于平稳,最终碎胀系数基本稳定在1.36左右,且根据巷道顶板碎胀系数变化规律选择合适的爆破布点,对于顶板岩石预裂成型具有实际意义。

Through real-time observation and measurement of the site′s collapse at a measuring point,obtained the roof mudstone bulk coefficient by bulk coefficient determination method of roof mudstone in 110 method.The results show that:As the work surface progresses,the mudstone of the roof continues to collapse,and the initial bulk coefficient of the mudstone in the roof is obtained.After the roof collapses,it is gradually compacted,the bulk coefficient gradually decreases,and the reduction gradually becomes stable,the final bulk coefficient is basically stable at about 1.36,according to the change regularities of the roof bulk coefficient in the roadway to select the appropriate blasting site,it is of practical significance for the pre-splitting of roof rock.