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为深入探讨硬煤的煤与瓦斯突出机制,对深部硬煤掘进工作面煤与瓦斯突出的相关理论和模型试验进行研究。根据断裂力学、岩石力学及煤与瓦斯突出有关理论,提出深部开采过程中硬煤掘进工作面薄板理论假设,并将该理论应用于深部硬煤掘进工作面煤与瓦斯突出模拟试验研究。对硬煤掘进工作面薄板理论分析,认为工作面尺寸、煤的弹性模量、围岩侧压系数、瓦斯压力等因素对硬煤掘进工作面突出具有较大影响。试验结果表明,在围岩应力、煤的坚固性系数较大的情况下,硬煤突出临界条件主要受围岩应力、煤的弹性模量、围岩侧压系数及工作面尺寸等因素影响,而受瓦斯压力影响相对较小;在围岩应力、试样的坚固性系数较大且煤的弹性模量和侧压系数稳定不变的情况下,发生突出的临界轴向应力随模拟工作面尺寸增大而近似呈线性减小。试验结论基本符合本硬煤突出薄板模型理论公式,在一定程度上验证了硬煤掘进工作面煤薄板模型理论及硬煤掘进工作面突出机制假设。
In order to further explore the mechanism of coal and gas outburst in hard coal, the related theories and model tests on coal and gas outburst in deep hard coal heading face are studied. According to the theory of fracture mechanics, rock mechanics and the theory of coal and gas outburst, this paper puts forward the hypothesis of the thin plate theory of the hard coal heading face in the deep mining process, and applies the theory to simulate the coal and gas outburst in the deep hard coal heading face. The theoretical analysis of the face of hard coal heading face shows that the factors such as face size, elastic modulus of coal, lateral pressure coefficient of surrounding rock and gas pressure have a significant impact on the heading of hard coal heading face. The test results show that under the conditions of surrounding rock stress and coal solidity coefficient, the critical critical conditions of hard coal are mainly affected by factors such as surrounding rock stress, elastic modulus of coal, lateral rock pressure coefficient and working face size, While the influence of gas pressure is relatively small. In the case of surrounding rock stress, the solidity coefficient of the sample is large and the elastic modulus and lateral pressure coefficient of the coal are stable, the critical axial stress that appears prominently with the simulated working face The size increases and decreases approximately linearly. The experimental conclusion basically conforms to the theoretical formula of the hard plate protruding sheet metal model, to a certain extent, validated the coal sheet metal model theory of hard coal heading face and the hypothesis of prominent mechanism of hard coal heading face.