抽采过程中含瓦斯煤渗透率动态变化特征  

Dynamic Variation Characteristics of Permeability of Coal Containing Gas in Process of Extraction

作　　者：徐刚[1,2] 刘超[1,2] 金洪伟[1,2] 

机构地区：[1]西安科技大学安全学院,西安710054 [2]西部矿井开采及灾害防治教育部重点实验室,西安710054

出　　处：《煤炭技术》2017年第3期159-162,共4页Coal Technology

基　　金：国家自然科学基金资助项目(51404189);陕西省自然科学基础研究计划资助项目(2015JQ5191)

摘　　要：基于孔隙率的定义,建立了考虑孔隙瓦斯压力、瓦斯吸附膨胀和地应力作用的含瓦斯煤渗透率模型,并研究了抽采过程中含瓦斯煤渗透率的动态变化特征。结果表明:含瓦斯煤的渗透率随地应力的增加呈指数形式降低,随瓦斯压力的减少呈现出先减小后增大的变化特征;瓦斯抽采过程中煤体弹性模量越小和吸附常数越大越有利于煤体渗透率的改善,而泊松比的变化对煤体渗透率的影响较小,对于合理地选择瓦斯抽采区域、布置瓦斯抽采工程和采取瓦斯抽采措施具有一定的指导意义。Based on the definition of porosity, the model of permeability of coal contain gas has been established which considering the pore gas pressure, gas adsorption swelling and stress, and the dynamic characteristics of permeability of coal contain gas has been studied in the process of gas extraction. The results show that the coal permeability decreases exponentially with the increase of stress, and with the decrease of gas pressure the characteristic of coal permeability first decrease and then increase is presented; in the process of gas drainage the smaller coal body elastic modulus and the bigger adsorption constant are beneficial to the improvement of permeability of coal body, and the variation of Poisson＇s ratio has little effect on the permeability of coal body, which provided certain guiding significance for reasonable choice of gas extraction area, layout of gas drainage engineering and adopting gas drainage measures.

关 键 词：含瓦斯煤体 孔隙率 渗透率 瓦斯抽采 

分 类 号：TD712[矿业工程—矿井通风与安全]