东荣二矿回采巷道特类复合顶板活动规律分析

Analysis of law of multiple roof-rock in extraction roadway in dongrong coal mine

在现场勘测和实验研究基础上,界定出东荣二矿17号煤层回采巷道顶板属于顶板各组成分层内部隐含有众多超薄子分层的一种特殊类型的复合顶板,即超薄复层特殊复合顶板,分析得出了该类顶板具有双重属性的结论,即在顶板各分层相对完整状态下呈现复合顶板变形特征,而在顶板完整性遭到破坏后,呈现类似散体的软岩变形特征。指出该类复合顶板的控制关键是时间和空间控制。这项研究的成功实践对国内煤矿同类顶板条件下的锚杆应用具有重要的参考价值和指导意义。

On the basis of reconnaissance on the spot and study with experimentation ,the article identified and confirmed thatthe extraction roadway roof-rock about No.17 coal bed in Dongrong coal mine is a special multiple roof-rock, in every bed that formed the roof-rock there are many super-thin subordinate beds, namely, it is a super-thin multiple beds special roof-rock. The roof-rock has dual characteristic, namely, It takes on the feature of multiple roof-rock under the integrated condition, otherwise it will take on the deformation feature like shatter soft-rock after destruction. The key element of control is time-control and space-control. The successful research has important reference value and significance in the application of anchor under the same sort roof-rock condition .