基于能量理论的含瓦斯煤体突出失稳倾向分析

Analysis of outburst instability tendency of coal containing methane based on energy theory

摘要: 为了分析构造煤的非稳态扩散特性对构造煤体能量失稳评判的影响，利用稳态和非稳态瓦斯扩散模型，建立了原生煤和构造煤的初始瓦斯扩散系数与压力的函数关系式；基于现有的能量公式，构建了煤体的吸附和游离瓦斯膨胀能的计算模型；分析了埋深与突出能量的关系，探讨了不同埋深条件煤体的突出能量失稳倾向性，获得了构造煤层突出临界埋深为190 m；最后通过现场瓦斯动力现象对结论的准确性进行了验证。

Abstract: In order to analyze the influence of unsteady diffusion characteristics of tectonic coal on energy instability, the steady and unsteady gas diffusion models were used to establish the functional relationship between the initial gas diffusion coefficient and pressure of intact coal and tectonic coal. Based on the existing energy formula, the calculation models of adsorbed gas and free gas expansion energy were established. The relationship between buried depth and outburst energy was analyzed, and the instability tendency of outburst energy in coal under different buried depths was discussed. The critical buried depth of outburst in the tectonic coal seam was 190 m, and the field gas dynamic phenomenon also verified the conclusion.