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.
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2019, Vol. 38 
