不等强锚杆支护技术在常村煤矿动压巷道的研究与应用

A technology research of the gas tail roadway reinforcement optimization under the influence of secondary mining

矿井随着采深的不断增加,瓦斯涌出量急剧增加,威胁矿井安全,通过采取在两个工作面之间共用瓦斯尾巷的方法解决这一问题,在两个工作面采动的影响下瓦斯尾巷的支护变得更加困难。本文通过利用FLAC3D软件模拟瓦斯尾巷在等强加固支护和不等强加强支护情况下的变形破坏情况。通过分析比较结果表明瓦斯尾巷顶底板、两帮移近量等强加强支护的情况超前支承压力影响下急剧增加,而采用不等强支护技术能有效控制巷道变形,且在二次动压的影响下可以确保围岩稳定。

With the increasing of mining depth and mining production, gas emission increased sharply, and threatened the mine safety. By adopting a shared gas tail roadway between two working face to solve this problem, the gas tail roadway support under the influence of two face mining became more difficult. By using FLAC3D, this paper simulated the deformation and breakage of the gas tail roadway under the same strong reinforcement support and the different strong reinforcement support. Through the analysis and the comparison it showed that it in-creased dramatically under the influence of the pull-ahead abutment pressure which was caused by the same strong support of the gas tail roadway roof and floor and two sides convergence, especially under the influence of the second dynamic pressure, the supporting effect is poorer;while it increased slowly under the situation of the different strong reinforcement support, and under the influence of the second dy-namic pressure the stability of surrounding rock can be determined.