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煤层中高压瓦斯主要以吸附态为主,为了研究吸附瓦斯含量对煤与瓦斯突出的影响,利用吸附性依次增强的氦气、氮气、甲烷和二氧化碳模拟相同气压下吸附瓦斯含量的不同。将0.75 MPa的上述4种气体充入物理力学性质相同的型煤并充分吸附,模拟游离瓦斯含量相同、吸附瓦斯含量不同的煤体,考虑4种不同强度型煤开展16次瞬间揭露试验。试验发生9次持续时间1 s左右的突出现象,对于低强度型煤试验不吸附的氦气也发生突出现象;试验结果表明随吸附气体含量增加,型煤发生突出的风险增大,吸附气体含量越大其突出强度越大。提出吸附气体膨胀能的测定方法,根据突出能量公式计算发生突出的煤体弹性能、吸附及游离气体膨胀能等突出潜能和煤体破碎功、抛出功等突出耗能,突出潜能与突出耗能基本相等验证吸附气体膨胀能测定方法的合理性。能量分析表明参与突出过程的吸附气体膨胀能占总气体膨胀能的7.9%~32.3%,占突出潜能的6.5%~25.6%,且其占比随吸附气体含量增大而增大。研究成果为揭示、量化吸附瓦斯含量在突出中的作用提供参考和依据。
In order to study the influence of adsorbed gas content on coal and gas outburst, the different adsorbed methane content under the same gas pressure is simulated by using helium, nitrogen, methane and carbon dioxide with enhanced adsorption in sequence. The above 4 kinds of gas of 0.75 MPa were charged into the briquette with the same physical and mechanical properties and fully adsorbed to simulate the coal with the same free gas content and different gas contents, and 16 instant exposure experiments were carried out with 4 kinds of briquette with different strength. The phenomenon of 9 times duration of 1 s in the test occurred prominently, and the phenomenon of helium which did not adsorb on the low-strength briquette also appeared prominently. The experimental results showed that with the increase of the content of the adsorbed gas, the risk of the briquette increased prominently. The adsorption gas content The greater the greater the intensity of its prominent. The method of determining the swelling energy of adsorbed gas is proposed. According to the prominent energy formula, the salient potential energy of coal body, the prominent potential of adsorption and free gas expansion, the breaking energy of coal body, Can be basically equal to verify the determination of adsorption gas expansion method rationality. The energy analysis shows that the swelling energy of the adsorbed gas involved in the salient process accounts for 7.9% -32.3% of the total gas expansion energy, accounting for 6.5% -25.6% of the salient potential, and its proportion increases with the increase of the adsorbed gas content. The research results provide reference and basis for revealing and quantifying the role of adsorbed gas content in prominence.