大倾角煤层大采高采场基本顶时序性破坏机
Timing Failure Mechanism of Basic Roof of Large Mining Height Stope in Steeply Dipping Coal Seam
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摘要: 大倾角煤层大采高工作面基本顶时序性破断,致使工作面时序性来压,不同区域支架承载状态异化,围岩控制难度及生产风险增加。为弄清基本顶时序性破坏机理,综合采用现场实测、理论分析等法,对基本顶时序性破坏特征,工作面不同区域承载结构,基本顶周期性垮落长度等情况进行研究。结果表明:大倾角工作面基本顶时序性破坏特征为先中部、次上部、后下部,破断岩体(矸石)非对称充填采空区,使得工作面不同区域内矸石对覆岩力学效能不同,形成分区式力学承载结构,基本顶处于不同强度的力学环境中,不同强度力的作用导致基本顶垮落步距不同,从而发生时序性破坏。Abstract: The timing failure of basic roof of large mining height stope in steeply dipping coal seam results in the sequential pressure of the working face, the bearing state of supports in different regions is dissimilar, and the difficulty of surrounding rock control and production risk increase. In order to find out the failure mechanism of the sequential failure of the basic roof, the temporal failure characteristics of the basic roof, bearing structures in different regions of the working face, and the periodic collapse length of the basic roof were studied by field measurement and theoretical analysis. The results show that the timing failure characteristics of the basic roof of the high-inclination working face are the first middle part, the second upper part, the next lower part, and the broken rock mass (gangue) asymmetrically filling the goaf, which results in the different mechanical performance of gangue to overburden in different areas of the working face, forming a partitioned mechanical bearing structure; the basic roof is in the mechanical environment of different strength, and the action of different strength force leads to different falling step distance of the basic roof, thus causing the timing failure.
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Keywords:
- steeply dipping /
- large mining height /
- basic roof /
- timing failure /
- bearing structure
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