• 论文
主办单位:煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
深埋采场压架切顶诱发井下泥石流形成机理与防控
  • Title

    Formation mechanism and prevention and control of underground debris flow induced by roof-cutting of pressured support in deep-buried face

  • 作者

    柳昭星董书宁靳德武郭小铭刘英峰杨建郭康尚宏波

  • Author

    LIU Zhaoxing1,2,3 ,DONG Shuning2,3 ,JIN Dewu2,3 ,GUO Xiaoming2,3 ,LIU Yingfeng2,3 , YANG Jian2,3 ,GUO Kang2,3 ,SHANG Hongbo2,3

  • 单位

    西安科技大学 地质与环境学院中煤科工集团西安研究院有限公司陕西省煤矿水害防治技术重点实验室

  • Organization
    1. College of Geology and Environment,Xi’an University of Science and Technology,Xi’an  710054,China; 2. Xi’an Research Institute,China Coal Tech-nology and Engineering Group,Xi’an  710054,China; 3. Shaanxi Key Laboratory of Prevention and Control Technology for Coal Mine Water Hazard,Xi’an  710077,China
  • 摘要

    随着西部黄陇煤田煤炭资源的大规模开发与利用,该地区出现了一种危害严重的新型顶板灾害:采场压架切顶诱致井下泥石流灾害。由于事故采场埋深大、基岩厚,导致其与西北浅埋煤层和华北近松散层煤层采场遇到的压架切顶和突水溃沙(砂)灾害,以及金属矿井下泥石流和煤矿断层、采空区泥石流灾害在物源和动力源上均有所不同。为防止该类型灾害再次发生,采用理论分析、数值计算和室内试验等手段,从灾害形成的物源、动力源及其影响因素等角度,分析研究了采场覆岩破坏特征、支架合理工作阻力、工作面节理裂隙发育产状、临近工作面倾斜支承压力叠加影响、含水层水力梯度条件和弱胶结地层物理力学特征及其矿物成分等,揭示了事故采场压架切顶和井下泥石流灾害的形成条件和2者的内在联系。研究结果表明:该类型灾害形成包括客观必要条件和诱发因素,客观必要条件为包含大量亲水矿物的弱胶结直罗组泥岩类顶板地层(物源)和复合关键层滑落失稳(动力源),诱发因素为支架工作阻力过小、临近工作面倾向支承压力叠加影响、工作面推进速度缓慢、顶板含水层较大的水力梯度和工作面顶板节理裂隙产状特征,即在客观必要条件存在的情况下,多个灾害诱发因素叠加导致客观必要条件灾变。因此,针对该灾害类型形成了“查清客观必要条件、控制和避免诱发因素”的防控技术路线。

  • Abstract
    With the large-scale development and utilization of coal resources in Huanglong coalfield in Western China,a new type of roof disaster has emerged in this area:debris flow disaster caused by roof cutting of roof support. Because of the large burial depth and thick bedrock,it is different from that of the shallow seam in Northwest China and the loose seam in North China in terms of material and power sources. In order to prevent the recurrence of this type of disaster, this paper analyses and studies the characteristics of overburden failure,reasonable working resistance of support,occur- rence of joints and fissures in working face,the superposition effect of abutment pressure of inclination of adjacent work- ing face,hydraulic gradient condition of aquifer,physical and mechanical characteristics of weak cemented stratum and mineral composition by means of theoretical analysis,numerical calculation and laboratory test from the angle of material source,power source and its influencing factors of disaster formation,and reveals the formation conditions of roof cutting by pressured support in accident face and the internal relationship between them. The results show that the formation of this type of disasters includes necessary natural conditions and inducing factors. The necessary natural conditions are weak cemented strata (provenance) of the mudstone roof of the Zhiluo Formation containing a large amount of hydro- philic minerals and sliding instability (power source) of the composite key strata. The inducing factors are too small re- sistance of support work,superposition effect of inclined abutment pressure near working face,slow advancing speed of working face,large hydraulic gradient of roof aquifer and occurrence characteristics of roof joints and fissures in working face,that is to say,when necessary natural conditions exist,the superposition of multiple disaster-inducing factors leads to disaster. Therefore,aiming at this disaster type,the paper has formed the prevention and control technical route of “finding out the necessary natural conditions,controlling and avoiding the inducing factors”.
  • 关键词

    压架切顶井下泥石流关键层复合破断弱胶结顶板滑落失稳

  • KeyWords

    pressured support and roof cutting;underground debris flow;composite fracture of key strata;weak cemen- ted roof;slip instability

  • 基金项目(Foundation)
    国家重点研发计划资助项目(2017YFC0804100);中国煤炭科工集团有限公司科技创新创业资金专项面上资助项目(2018-TD-MS070);陕西省自然科学基础研究发展计划资助项目(2019JQ009)
  • DOI
  • Citation
    LIU Zhaoxing,DONG Shuning,JIN Dewu,et al. Formation mechanism and prevention and control of underground deb- ris flow induced by roof-cutting of pressured support in deep-buried face[ J]. Journal of China Coal Society,2019,44 (11):3515-3528.
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主办单位:煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会

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