Study on Step-by-step Simulation of Coal Gas Pressure under High Pressure Air Shock
胡宗源 HU Zong-yuan
（中煤科工集团重庆研究院有限公司，重庆 400039）
（China Coal Technology and Engineering Group Chongqing Research Institute Co.，Ltd.，Chongqing 400039，China）
摘要： 煤层渗透性严重影响着矿井瓦斯抽采及瓦斯突出防治工作，而我国井田内煤层多为低透气性突出煤层。为提高低透气性煤层的渗透性采用高压空气冲击煤体增透技术，以多孔介质渗流理论为基础，结合高压空气冲击煤体的气体压力变化，应用有限元软件实现了用不同压力值的高压空气多点连续式冲击煤体的模拟计算。研究表明：高压空气压力影响着煤体的透气性，且煤层中的气体压力分布范围随着冲击煤体的高压空气压力值的升高而逐渐增大；距离自由面越近煤体受到的冲击越大，而深部煤体的影响相对较小。
Abstract: The permeability of coal seams seriously affects the gas drainage and gas outburst prevention work in coal mines, and most of the coal seams in China are outburst coal seams with low permeability. In order to improve the permeability of coal seams with low permeability, the high-pressure air percussion technology is adopted. Based on the porous medium seepage theory, combined with the gas pressure change of high-pressure air percussion coal, the simulation calculation of multi-point continuous percussion coal with different pressure values is realized by using finite element software. The results show that the high pressure air pressure affects the permeability of the coal body, and the gas pressure distribution range in the coal seam gradually increases with the increase of the high pressure air pressure value of the impact coal body; The closer to the free surface, the greater the impact on the coal body, while the impact on the deep coal body is relatively small.
关键词： 高压空气；增透技术；低透气性煤层；数值模拟
Key words: high-pressure air；technology for increasing the permeability of gas extraction；low-permeability coal seams；numerical simulation
中图分类号：TD712 文献标识码：A 文章编号：1006-4311（2022）21-156-03
DOI:10.3969/j.issn.1006-4311.2022.21.049.
文章出处：胡宗源. 高压空气冲击条件下煤体气体压力分步模拟研究[J]. 价值工程,2022,41(21):156-158.
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