Back-Analysis of Parameters of Gas Eztraction by Relief Pressure from a Long-Distance Using RFPA2D-GASFLOW Model
On the basis of basic theories on gas flow and coal deformation, the coupled gas-rock model for investigating the failure process of coal-rock is established by introducing the related equations governing the evolution of stress, damage and gas permeability along with the deformation of coal and rock. Implemented with Rock Failure and Process Analysis code (RFPA), this model can be used to capture the evolution of gas permeability in coal seam with deep depth and the distribution of gas pressure around the drilling hole, and explore the instantaneous seepage mechanism of gas flow. From the simulated results, it can be found that the coal seam, located around 67m above the excavating seam, is in unloading state and its gas permeability dramatically increases about 2, 000 times as excavating in underlying coal seam. And the size of the unloading region is around 70m in diameter. The simulated results are keeping in good accordance with the in-situ evaluation. Therefore, it is safe to say that this numerical tool is of significance in both theory and practice to investigate the mechanisms of gas permeability evolved and gas drainage.
gaseous coal gas permeability numerical simulation coupling of stress-damage-flow
Yang Tianhong Feng Yanfeng Tang Chunan Xu Tao
School of Resources and Civiling Engineering, Northeastern University, Shenyang 110004, China School of Civil and Hydraulic Engineering, Dalian University of Technology, Dalian 116024, China
国际会议
The 3rd International Symposium on Modern Mining & Safety Technology Proceedings(第三届现代采矿与安全技术国际学术会议)
辽宁阜新
英文
392-396
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）