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通过理论分析及采用一定破碎程度的非构造煤来仿制构造煤试验,研究仿制构造煤在初始释放瓦斯膨胀能方面的特征,并探讨其用于鉴定煤层突出危险性的可行性。试验结果表明:在瓦斯解吸的初始阶段,构造煤与仿制构造煤的瓦斯压力、瓦斯放散量、膨胀能均以负指数规律衰减,且在1000 ms之后就基本维持恒定值,并且膨胀能在超临界压力下的衰减速度小于亚临界状态下的衰减速度,衰减曲线在临界压力处产生拐点。相同破碎程度的仿制构造煤与构造煤的初始释放瓦斯膨胀能表现基本一致,这对解决煤层的突出危险性鉴定过程中,由于无法采集或不易采集到那些导致突出的构造煤煤样而采用非构造煤样做出判断失实的问题,有着十分重要的意义。
Through the theoretical analysis and the use of a certain degree of fragmentation of non-structural coal to imitate tectonic coal test to study the characteristics of imitation tectonic coal in the initial release of gas expansion energy, and explore its feasibility for identifying coal outburst danger. The experimental results show that the gas pressure, gas emission and expansion energy of tectonic coal and imitation tectonic coal all attenuate with negative exponential law in the initial stage of gas desorption and maintain a constant value after 1000 ms, The decay rate under critical pressure is less than the decay rate under subcritical conditions, and the decay curve creates an inflection point at the critical pressure. The same degree of crushing imitation tectonic coal and tectonic coal initial release of gas expansion performance is basically the same, which is to solve the outstanding danger of coal seam identification process, due to the acquisition is not easy or difficult to collect those who lead to the prominent coal samples and the use of non-structural coal It is of great significance to construct a sample of coal to make a judgment that is inaccurate.