远距离保护层开采煤层渗透特性及瓦斯抽采技术研究  

Study on permeability characteristic of coal seam and gas extraction techniques in coal mining with long distance protection coal seam

作　　者：王文[1] 李化敏[1] 高保彬[2] 李东印[1] 

机构地区：[1]河南理工大学能源科学与工程学院,河南焦作454000 [2]河南理工大学安全科学与工程学院,河南焦作454000

出　　处：《中国安全生产科学技术》2014年第11期84-89,共6页Journal of Safety Science and Technology

基　　金：国家自然科学基金项目(51274086)

摘　　要：依据平顶山矿区某矿的丁、戊组煤层（间距90m）的地质条件,采用实验室试验、数值模拟和现场试验相结合的方式,对远距离下保护层开采煤层渗透特征及瓦斯抽采技术展开探讨。运用自制的煤-气耦合系统进行了大尺寸煤样的加载试验,试验将煤样加载及裂隙发展分原生微孔隙压密阶段、煤样的弹性变形阶段、膨胀破坏阶段和峰后的破坏阶段四阶段,卸载后煤样孔隙不闭合,渗透系数仍能保持高位运行;并对现场丁组煤的卸压区域进行参数测试,卸压效果明显,煤层透气性系数增加720～1550倍,卸压范围内的煤层煤与瓦斯突出危险性消除;根据对被保护层裂隙场形成分析,提出了煤与瓦斯共采中卸压瓦斯抽采钻孔抽采最佳时机,实现了戊组煤开采与丁组煤瓦斯抽采在时间、空间上的有序配合。According to the geological conditions of Ding group coal seams and Wu coal group seams（the separation distance of them was 90 meters） in Pingdingshan mine area,the characteristics of coal seam permeability and the gas extraction techniques with the influence of long distance protection coal seam were studied by adopting various methods including laboratory tests,numerical simulation,as well as field tests.The loading tests on the large dimension coal samples were conducted by the self-developed coal-gas coupling system.It showed that there are four stages in the coal sample loading and fracture development process,including primary micropore pressurization stage,coal sample elastic deformation stage,drum-expansion destruction stage and post-peak destruction stage.In addition,the micro pores in the sample are not closed and the permeability coefficient is still high after unloading.Field tests on parameters in the destressed zone of Ding seams revealed that the effect of pressure relief was obvious,the permeability coefficient of coal seam increased 720-1550 times,and the hazard of coal and gas outbursts was basically eliminated in released zone.According to the analysis on the formation of fracture field in protectioncoal seam,the best time of destressed gas extraction from drilling holes in simultaneous extraction of coal and gas was determined,which realized an orderly cooperation in the time and space between the mining in Wu seams and the gas extraction in Ding seams.

关 键 词：远距离保护层 渗透性 瓦斯抽采 煤与瓦斯共采 

分 类 号：X936[环境科学与工程—安全科学]