摘要
在大倾角中厚煤层沿空留巷中,以往的支护方式难以满足大倾角中厚煤层巷道特殊的围岩结构稳定的需要,同时无法适应工作面内矸石垮落造成留巷困难。文章针对这一难题,首次提出并采用了"柔性护巷"技术,通过利用巷道上帮形成的由垮落矸石堆积在特制钢筋网上的"包护带",允许巷道顶板有一定的下沉量,从而使矸石充分为巷道顶板组合岩梁结构提供支撑力。在总结其施工工艺的基础上,通过现场试验,研究了巷道矿压显现规律、顶板移动规律、矸石垮落堆积规律和钢筋网变形规律;实验结果表明,在利用锚、网、索、支柱联合支护的基础上,应用"柔性护巷"技术能有效地解决大倾角中厚煤层沿空留巷技术难题。
It is difficult for old methods of support to meet the stabmty reqmremems ,u, ~ ： thick coal seam with a large inclined angle and to provide ＂gob-side＂ entry retaining due to gangue cawng. Therefore, a flexible support technique is proposed in this paper： utilizing the protective covering zone formed by gangues that have caved in on specialized steel mesh to allow a certain settlement of the roadway roof and provide support for the combined rock beam structure above the roadway roof. Based on the construction process and field tests, the haws of strata pressure behavior, roof movement, the stacking of collapsed gangues and steel mesh deformation were obtained, proving the availability of this technique on the basis of a bolt-mesh-cable-pillar combined support.
出处
《现代隧道技术》
EI
CSCD
北大核心
2015年第2期198-204,共7页
Modern Tunnelling Technology
关键词
大倾角中厚煤层
沿空留巷
柔性护巷
自然垮落
Semi-thick coal seam with a large inclined angle
＂Gob-side＂ entry retaining
Flexible support
Spontaneous caving
