仿制构造煤的初始释放瓦斯膨胀能特性研究

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.

Study on the Initial Released Gas Expansion Energy Property of Imitation Tectonic Coal

Through theoretical analysis and the trial of imitation tectonic coal which is made of certain fragmentation degrees of non-tectonic coal,the thesis studies on the Initial Released Gas Expansion En-ergy Property of Imitation Tectonic Coal and discusses the possibility of taking the place of tectonic coal with imitation tectonic coal.The result of lab test proves that gas pressure,gas released volume and ex-pansion energy of initial released gas of both tectonic coal and imitation tectonic coal all keep consistent with negative exponent curve.They stand still 1 000 ms later while cumulative volume of released gas is increasing continuously,and decay rate of expansion energy in the super critical state is smaller than that in the subcritical state.At the same time there is an inflection point at critical pressure.Expansion energy of initial released gas of imitation tectonic coal which has the same fragmentation degree as tec-tonic coal is equal to that of tectonic coal approximately.It is very significant to solve the problem of making wrong determination using non-tectonic coal instead of tectonic coal in coal and gas outburst identification,which caused by the difficulty of collecting tectonic coal.