采动煤体蠕变失稳研究
Study on Creep Instability of Mining Coal
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摘要: 为了研究瓦斯涌出导致采动煤体蠕变失稳的问题,应用非线性模型理论和线性叠加原理,建立动载荷条件下的非线性蠕变方程来模拟含瓦斯煤体失稳过程。结果显示:蠕变方程能够很好的描述瓦斯涌出过程中含瓦斯煤体蠕变失稳过程;地应力是含瓦斯煤体失稳的第1因素,而瓦斯涌出将导致煤体失稳并加速失稳过程;屈服应力是预警煤与瓦斯突出关键参数。Abstract: In order to study the problem of creep instability of mining coal due to the gas emission, a nonlinear creep equation was developed to simulate its creep instability process, which was derived by the nonlinear model theory and the linear superposition principle under the condition of dynamic load. The results showed that the creep equation can well describe the creep instability process of mining coal during the gas emission; the crustal stress is the first factor of mining coal, however, the gas emission will lead to its instability and accelerate the instability process; yield stress is the key reference point for early warning of coal and gas outburst.
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