瓦斯抽采过程中煤体低温氧化对煤岩动力灾害的影响

发布时间：2018-11-14 09:54

【摘要】：为了探究瓦斯抽采过程中煤岩动力灾害演化过程,了解煤体低温氧化对瓦斯突出影响的作用机理,通过保水法测孔隙率、P波波速测量、瓦斯放散初速度△p和煤岩坚固性系数f来评估瓦斯抽采过程中煤体低温氧化对煤岩动力灾害发生的影响。实验表明:随着煤体氧化温度的升高,煤体质量和P波波速持续降低,煤体内部裂隙逐步发育,孔隙率提高了73.3%;由于煤体内部裂隙发育,煤体结构遭到破坏,坚固性系数随着煤体氧化温度的升高而降低;与煤体坚固性系数相反,由于煤体内部裂隙发育,为瓦斯释放提供了通道,导致瓦斯放散初速度随着煤体氧化温度的升高而增加,并且升高速率逐步增加。煤体的低温氧化过程会导致煤体强度降低,瓦斯涌出压力增加,引发瓦斯突出综合预测指标K值大幅增加,煤岩动力灾害发生可能性也随着增加。
[Abstract]:In order to investigate the evolution process of coal and rock dynamic disasters during gas extraction, and to understand the mechanism of the influence of low temperature oxidation of coal body on gas outburst, the porosity and P wave velocity were measured by water retention method. The initial velocity of gas release p and the coefficient f of coal rock firmness are used to evaluate the influence of low temperature oxidation of coal body on the occurrence of dynamic disasters of coal and rock during the process of gas extraction. The experimental results show that with the increase of coal oxidation temperature, the mass of coal and the velocity of P wave decrease continuously, the cracks in coal body develop gradually, and the porosity increases by 73.3%. Because of the development of internal cracks in coal body, the structure of coal body is destroyed, and the coefficient of solidity decreases with the increase of oxidation temperature of coal body. Contrary to the solid coefficient of coal, because of the development of cracks in coal body, the gas release channel is provided, and the initial velocity of gas release increases with the increase of oxidation temperature of coal body, and the rising rate increases step by step. The low temperature oxidation process of coal body will lead to the decrease of coal strength, the increase of gas emission pressure, the increase of K value of comprehensive prediction index of gas outburst, and the possibility of occurrence of dynamic disaster of coal and rock with increasing.
【作者单位】：中煤科工集团重庆研究院有限公司;中国矿业大学;
【分类号】：TD712.6

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