采矿与安全工程学报 ›› 2016, Vol. 33 ›› Issue (3): 444-451.

• 论文 • 上一篇    下一篇

基于煤体微裂隙演化进程的综放窄煤柱煤巷非对称支护研究

  

  1. 1.华北科技学院安全工程学院,北京 101601;2.中国矿业大学(北京) 资源与安全工程学院,北京 100083
  • 收稿日期:2015-06-14 出版日期:2016-05-15 发布日期:2016-06-03
  • 作者简介:殷帅峰(1985—),男,河南省汝州市人,讲师,博士,从事巷道支护、矿山压力及采场生产保障系统方面的研究。
  • 基金资助:

    中央高校基本科研业务费项目(3142015003);国家自然科学基金项目(51404105);河北省高等学校科学技术研究项目(QN2016333)

Study on asymmetric support of coal roadway nearby narrow pillar based on microcracks evolution process in fully-mechanized caving mining

  • Received:2015-06-14 Online:2016-05-15 Published:2016-06-03

摘要: 针对窄煤柱煤巷掘进完成初期出现的大变形控制难题,结合窄煤柱煤巷动静支承压力基本认识,运用 CT 扫描技术系统研究了窄煤柱煤巷巷道中心轴两侧煤体微裂隙的演化进程,提出双锚索桁架与单体锚索平行布置非对称支护技术,并对其组成结构、控制机理、应力场分布规律进行了系统研究。结果表明:1) 窄煤柱煤巷巷道中心轴两侧煤体微裂隙数量、发育速度和贯通速度具有明显的不对称性;2) 顶板和煤柱帮桁架锚索应力场沿垂直方向呈“蝙蝠形”向岩体深部扩展,应力叠加区更大范围锚固体处于受压应力状态。双锚索桁架平行布置非对称支护技术在 120210 窄煤柱煤巷试验成功,巷道围岩在静态支承压力和动态支承压力作用期间变形协调一致,控制效果良好,研究成果对类似工程条件的支护设计具有一定的理论意义和实用价值。

关键词: 动静支承压力, CT 扫描, 双锚索桁架, 非对称布置, 应力扩展

Abstract: To solve the controlling problems of the large deformation after the initial tunneling in coal roadway nearby narrow pillar, combined with the basic understanding of dynamic and static abutment pressure, the evolution process of microcracks was researched through CT scanning. Then, the asymmetric support technology of parallel-arranged composed of double truss cables and single cable was put forward, and its composition structure, controlling mechanism and stress field distribution characteristics were researched systematically. The research results have shown that 1) The numbers, development speed and penetration speed of microcracks are asymmetric on both sides of coal roadway; 2) The stress field distribution characteristics in the roof and coal pillar could be described as batwing expansion along vertical direction, and more anchorage-body remains in a compression state in stress superposition areas. The parallel-arranged asymmetric support technology was successfully applied in roadway 120210 nearby narrow pillar. The deformations in the roof and coal sides are coordinated and the controlling effects are well. The research findings will have great theoretical and practical value to other projects with similar engineering geological conditions.

Key words: dynamic and static abutment pressure, CT scanning, double truss cable, asymmetric support, stress expansion