二氧化碳/甲烷/氮气条件下煤样的初始释放瓦斯膨胀能研究

对同一个煤样分别充入不同压力的二氧化碳/甲烷/氮气进行初始释放瓦斯膨胀能测定试验,研究二氧化碳/甲烷/氮气条件下煤样的初始释放瓦斯膨胀能与瓦斯压力的关系,并分析二氧化碳/甲烷/氮气条件下的煤层突出危险性。结果表明:对于同种气体,煤样的初始释放瓦斯膨胀能与吸附平衡压力均成正相关关系,吸附平衡压力越大,煤样的初始释放瓦斯膨胀能越大,煤层突出危险性越大;对于不同气体,在吸附平衡压力相等的情况下,充二氧化碳的煤样具有较大的初始释放瓦斯膨胀能,突出危险性较大,充甲烷的次之,充氮气的最小。这一结论可以为解释煤矿现场突出和实验室突出模拟过程中的一些现象提供重要的依据。

Study on Initial Expansion Energy of Released Gas under CO2/CH4/N2Conditions

The initial expansion energy of released gas of the same coal sample under the condition of different gas pressure was tested after CO2/CH4/N2 was filled into the sample container respectively,the relationship between the initial expansion energy of released gas and the gas pressure was researched,and the outburst risk was analyzed. Results show that the relationship between the initial expansion energy of released gas and the gas pressure is adequately described by the linear equation. The equilibrium gas pressure is greater,the initial expansion energy of released gas is greater as well as the outburst risk. The initial expansion energy of released gas under carbon dioxide condition is the greatest,followed by that under methane condition and that under nitrogen condition,and the outburst risk has the same rule. The conclusion above can give a good explanation for the phenomena of field outbursts and laboratory simulations.