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针对我国“三软”矿区含瓦斯软煤严重的蠕变失稳问题,串联一个非线性黏塑性体与四元件线性黏弹性伯格体模型,建立含瓦斯软煤非线性黏弹塑性流变模型,并据此推导了煤壁蠕变失稳时间公式.针对采区工作面前方的矿压时空演化特征,建立了地应力和瓦斯压力随时间变化的函数M(t);通过煤与瓦斯突出判断条件,探讨了卸压区的形成对煤与瓦斯延期突出的影响.结果表明:“三软”矿区延期突出的滞后时间为第1阶段卸压带形成时间与第2阶段应力集中带软煤蠕变失稳时间之和.
Aiming at the severe creep instability problem of soft coal containing gas in the “Three Soft” mine in China, a linear viscoelastic Burgess model with nonlinear viscoplastic body and four elements is established in series to establish a nonlinear viscoelastic plastic flow And deduces the formula of creep instability time of coal wall.According to the temporal and spatial evolution of underground pressure in front of working face of mining area, the function M (t) of the variation of ground stress and gas pressure with time is established. Gas outburst judgment conditions, and discussed the effect of pressure relief zone formation on the extension of coal and gas delamination.The results show that the delayed delay time of “three soft” mining zone is the formation time of the pressure relief zone and the stress of the second stage Focus with the soft coal creep instability and the sum of time.