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煤与瓦斯突出是煤矿主要瓦斯灾害事故类型之一。目前,国内煤与瓦斯突出预测主要是根据瓦斯动力现象特征和基于煤层瓦斯压力、煤的破坏类型、坚固性系数与瓦斯放散初速度的四参数法。四参数法规定,4个参数均超过各自的临界值才能定为突出煤层;瓦斯压力的临界值为0.74MPa。但实践表明,瓦斯压力小于0.74 MPa也曾多次发生突出。本文用可压缩流体力学的观点分析了突出机理;采用多相连续介质力学中的应力分析法建立了煤与瓦斯突出预测的一个新指标F,并给出了有关参数的计算方法;案例分析表明,所得结果符合实际。
Coal and gas outburst is one of the major gas disasters in coal mines. At present, the prediction of domestic coal and gas outburst is mainly based on the characteristics of gas dynamic phenomena and the four-parameter method based on the coal seam gas pressure, the type of coal destruction, the solidity coefficient and the initial velocity of gas emission. The four-parameter method stipulates that all four parameters exceed their respective critical values before they can be identified as prominent coal seams. The critical value of gas pressure is 0.74MPa. However, practice shows that the gas pressure is less than 0.74 MPa has repeatedly prominence. In this paper, the salient mechanism is analyzed from the viewpoint of compressible fluid mechanics. A new index F for predicting coal and gas outburst is established by using stress analysis method in multiphase continuum mechanics, and the calculation method of the relevant parameters is given. Case studies show that , The result is in line with reality.