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浅埋沿空留巷切缝顶板断裂条件及移动规律研究

张国锋 苗沛沛 王二雨 陈新

张国锋, 苗沛沛, 王二雨, 陈新. 浅埋沿空留巷切缝顶板断裂条件及移动规律研究[J]. 矿业科学学报, 2017, 2(2): 109-119.
引用本文: 张国锋, 苗沛沛, 王二雨, 陈新. 浅埋沿空留巷切缝顶板断裂条件及移动规律研究[J]. 矿业科学学报, 2017, 2(2): 109-119.
Zhang Guofeng, Miao Peipei, Wang Eryu, Chen Xin. Research on roof fracture criterion and moving rule of gob-side entry in shallow seam[J]. Journal of Mining Science and Technology, 2017, 2(2): 109-119.
Citation: Zhang Guofeng, Miao Peipei, Wang Eryu, Chen Xin. Research on roof fracture criterion and moving rule of gob-side entry in shallow seam[J]. Journal of Mining Science and Technology, 2017, 2(2): 109-119.

浅埋沿空留巷切缝顶板断裂条件及移动规律研究

基金项目: 教育部高校博士点基金(20130023120011);中央高校基本科研业务费专项资金(2012800015DQ)
详细信息
    作者简介:

    张国锋(1982—),男,河南灵宝人,讲师,硕士生导师,主要从事无煤柱开采方面的研究。

  • 中图分类号: TD322

Research on roof fracture criterion and moving rule of gob-side entry in shallow seam

  • 摘要: 根据浅埋煤层顶板断裂后岩块间水平挤压力较小难以形成砌体梁的特点,分析了切顶卸压沿空成巷下的巷道顶板断裂结构,建立了下位切缝上位弯曲裂缝的双边悬臂梁的断裂力学模型,推导了沿空巷道侧向基本顶沿切缝结构面裂缝扩展断裂时的切顶工作阻力;建立了侧向基本顶两种不同顶板断裂位态下围岩结构数值模型,得出了两种断裂位态下的结构移动变形规律。当切顶阻力Q«ql时,巷道顶板沿煤壁内一定深度内断裂,空区侧弧形三角板直接顶的倒台阶悬臂结构可向沿空巷道围岩传递较大破断动载和覆岩移动压力;而当切顶阻力Q≥ql并与切缝联合切顶同时作用时,则可使得垮落带内直接顶和低位基本顶沿切缝结构面断裂滑落失稳,实现顶板断裂位态主动控制,减小弧形三角板侧向悬臂传递覆岩荷载的结构长度,优化顶板承载结构和围岩应力,降低巷旁支护体承受的附加荷载。同时切落后碎胀的矸石及时充填空区将上覆岩触矸点前移,减缓了上覆岩下沉和旋转变形作用力。哈拉沟矿浅埋薄基岩大断面复合顶板切顶成巷试验结果表明:沿空巷道超前切缝可减小侧向顶板区域支架工作阻力和直接顶垮落步距,降低岩板破断引起的冲击动载,实际切顶阻力与理论计算分析结果较为吻合。
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出版历程
  • 收稿日期:  2016-10-26
  • 刊出日期:  2017-04-29

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