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首页> 外文期刊>Shock and vibration >Coal Burst Induced by Horizontal Section Mining of a Steeply Inclined, Extra-Thick Coal Seam and Its Prevention: A Case Study from Yaojie No. 3 Coal Mine, China
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Coal Burst Induced by Horizontal Section Mining of a Steeply Inclined, Extra-Thick Coal Seam and Its Prevention: A Case Study from Yaojie No. 3 Coal Mine, China

机译：急倾斜特厚煤层水平断面开采引起的煤爆及防治-以中国姚街3号煤矿为例

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摘要

At present, coal bursts in working faces of steeply inclined coal seams (SICSs) have rarely been investigated, and current research focuses on the influences of roof breaking and instability of overlying structures in goaf on coal bursts; however, the stress state of coal masses in working faces being subjected to coal bursts is rarely researched. To overcome the above defects, a model for analysing stresses on coal masses in horizontal section of SICSs was established based on the coal burst that occurred in LW5521-20, Yaojie No. 3 Coal Mine, Lanzhou, Gansu Province, China. Moreover, the mechanism underpinning such a coal burst in SICSs was analysed based on the superposition mechanism of dynamic and static loads. The results show that the side abutment pressure near the roof and floor under the horizontal sections of SICSs is asymmetrically distributed in the vertical direction in which the peak of side abutment pressure near the roof is closer to the working face and therefore is taken as the source of static loads for coal bursts in working faces. When the superimposed dynamic load caused by hanging roof breaking and high static load borne in the coal masses is larger than the critical load for coal burst inception, a coal burst will occur. Furthermore, the superimposed dynamic load induced by coal bursts on the support and the initial static load on the supports are larger than their limiting load, which leads to support collapse and eventually causes dynamic failure of the working face. The coal burst in working faces in horizontal sections of SICSs can be prevented by using deep-hole presplit blasting in a hard roof, destress blasting in coal masses, and support optimisation of working faces, showing a favourable preventative effect.
机译：目前，很少研究急倾斜煤层（SICS）工作面中的煤爆，并且目前的研究集中在顶板破裂和采空区上覆结构的不稳定性对煤爆的影响。然而，很少研究工作面中煤团受压裂的应力状态。为克服上述缺陷，基于甘肃省兰州市姚街3号煤矿LW5521-20发生的煤爆，建立了SICSs水平段煤体应力分析模型。此外，基于动，静载荷的叠加机理，分析了SICSs中此类煤爆的基础机理。结果表明，SICSs水平剖面下顶板和底板附近的侧基台压力在垂直方向上是不对称分布的，顶板附近的侧基台压力峰值更靠近工作面，因此可以作为来源煤在工作面爆裂的静载荷。当吊顶破损和煤团中承受的高静态载荷所引起的叠加动载荷大于爆煤开始时的临界载荷时，就会发生爆煤。此外，由煤破裂引起的在支架上的叠加动态载荷和在支架上的初始静态载荷大于其极限载荷，这导致支架塌陷并最终导致工作面的动态破坏。通过在硬顶上进行深孔预裂爆破，对煤层进行爆破爆破以及对工作面进行支护优化，可以预防SICSs水平段工作面的煤爆，具有良好的预防效果。

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  • 来源
    《Shock and vibration》 |2019年第2期|8469019.1-8469019.13|共13页
  • 作者

    Wang Zhengyi; Dou Linming; Wang Guifeng;

  • 作者单位

    China Univ Min & Technol, Key Lab Deep Coal Resource Min, Minist Educ China, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Deep Coal Resource Min, Minist Educ China, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China;

    China Univ Min & Technol, Key Lab Deep Coal Resource Min, Minist Educ China, Sch Mines, Xuzhou 221116, Jiangsu, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
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