石门揭煤中煤体塑性区跃迁特征与诱突机制

doi:10.13722/j.cnki.jrme.2018.0913

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摘要为了研究石门揭煤突出的发生机制，在分析石门揭煤中煤与瓦斯突出的岩体、应力环境和物理现象基础上，依据煤岩蝶形破坏理论，建立石门揭煤中煤体塑性区形态及其诱突机制的分析模型。研究发现石门揭煤中煤体塑性区大小和形态存在蝶叶跃迁现象，塑性区大小对于主应力比值和煤岩体强度的变化具有高度敏感性，主应力比值或煤岩体强度达到某一临界条件后的微小增量均可以引起煤体塑性区的大幅增加。进而提出石门揭煤中煤体塑性区蝶叶跃迁诱发煤与瓦斯突出机制，即石门揭煤过程中，主应力比值和煤岩体强度的变化，使煤体在极短时间内产生一定范围的蝶叶塑性区，引发煤岩体内弹性能和瓦斯能的叠加突然释放，发生煤与瓦斯突出事故。并据此对红菱煤矿6•20特大突出案例进行计算机重演，获得的煤体蝶叶跃迁形态、范围与灾害案例中的突出空洞形态、突出煤量具有很好的一致性，为研究石门揭煤突出的发生机制提出一种新思路。

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	赵志强
	靳俊晓
	申金超

关键词 ：采矿工程, 石门揭煤, 煤与瓦斯突出, 蝶形破坏, 跃迁性

Abstract：In order to research the outburst mechanisms of rock cross-cut coal uncovering，the outburst rock mass，stress environment and physical phenomena in rock cross-cut coal uncovering were analyzed，and a analytical model for the shape of the coal plastic zone and its induced outburst mechanism of rock cross-cut coal uncovering was established according to the butterfly-shaped failure theory of coal rock. The study results show that there is a butterfly-shaped promotion in the size and the shape of plastic zones s of rock cross-cut coal uncovering，and that the size of butterfly-shaped plastic zone is highly sensitive to the changes of the principal stress ratio and the strength of the coal rock mass. When the ratio or the strength reaches a critical condition，a slight increment would result in a massive expansion of the plastic zone. The outburst mechanisms of coal and gas induced by the butterfly-shaped mutation of plastic zones in the process of cross-cut coal uncovering were revealed. A butterfly leaf plastic zone forms within a very short time due to the changes of the principal stress ratio and the strength of the coal rock mass，which triggers a sudden release of both the elastic energy and the gas energy in coal rock and then，a coal and gas outburst accident. A computer replay of the 6.20 extraordinarily prominent case of Hongling Coal Mine was carried out，and the calculated shape and scope of the butterfly-shaped promotion in the coal body are in good agreement with the prominent cavity shape and the outburst coal volume in the disaster case. The research provides a new idea for investigating the occurrence mechanism of rock cross-cut coal uncovering.

Key words： mining engineering rock cross-cut coal uncovering coal and gas outburst butterfly-shaped damage promotion characteristics

引用本文:

赵志强，靳俊晓，申金超. 石门揭煤中煤体塑性区跃迁特征与诱突机制[J]. 岩石力学与工程学报, 2019, 38(2): 343-352.
ZHAO Zhiqiang，JIN Junxiao，SHEN Jinchao. Promotion characteristics and induced outburst mechanisms of coal plastic zones in rock cross-cut coal uncovering. , 2019, 38(2): 343-352.

链接本文:

http://www.rockmech.org/CN/10.13722/j.cnki.jrme.2018.0913 或 http://www.rockmech.org/CN/Y2019/V38/I2/343

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