Volume 25 Issue 6
Dec.  2019
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Article Navigation >  Journal of Geomechanics  > 2019  >  25(6): 1099-1106
LI Liping, WU Jinpeng, JU Xiangyu, et al., 2019. ANALYSIS OF ULTRA-LOW FRICTION EFFECT OF COAL-ROCK COMBINATION BLOCK UNDER CONFINING PRESSURE AND IMPACT DISTURBANCE. Journal of Geomechanics, 25 (6): 1099-1106. DOI: 10.12090/j.issn.1006-6616.2019.25.06.093
Citation: LI Liping, WU Jinpeng, JU Xiangyu, et al., 2019. ANALYSIS OF ULTRA-LOW FRICTION EFFECT OF COAL-ROCK COMBINATION BLOCK UNDER CONFINING PRESSURE AND IMPACT DISTURBANCE. Journal of Geomechanics, 25 (6): 1099-1106. DOI: 10.12090/j.issn.1006-6616.2019.25.06.093
shu

ANALYSIS OF ULTRA-LOW FRICTION EFFECT OF COAL-ROCK COMBINATION BLOCK UNDER CONFINING PRESSURE AND IMPACT DISTURBANCE

doi: 10.12090/j.issn.1006-6616.2019.25.06.093
  • 1.

    School of Mechanics and Engineering, Liaoning Technical University, Fuxin 123000, Liaoning, China

  • 2.

    School of Transportation and Engineering, Dalian Maritime University, Dalian 116000, Liaoning, China

More Information
  • Received: 2018-10-15
  • Revised: 2019-09-10
  • Published: 2019-12-31
    Abstract
  • The deep coal-rock combinations vibrate under the action of vertical disturbance. When the horizontal impact overcomes the friction resistance between blocks, it is very easy to produce ultra-low friction rock burst. In this paper, the combination block of fine sandstone-coal-fine sandstone is regarded as the research object. Considering the mining condition of the roof-coal-floor near the working face, numerical simulation method was used to establish the numerical block model under confining pressure and impact disturbance. The horizontal displacement and vertical acceleration difference value of coal block are defined as characteristic parameters of ultral-low friction effect. The influence of confining pressure, vertical impact and horizontal impact on the characteristic parameters are analyzed. The results show that the residual and horizontal displacement peaks increase exponentially with the increase of confining pressure under the interaction of vertical impact and confining pressure. And under the interaction of vertical and horizontal impacts and confining pressure, the strength and duration of ultra-low friction effect also increase with the increase of confining pressure. The vertical impact has the most significant effect on the ultra-low friction effect in coal-rock combination block.

     

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