SEEPAGE-STRESS COUPLING MODEL OF HETEROGENEOUS COAL SEAMS BASED ON DOUBLE-MEDIA MODEL
To simulate the cleats effects of coalbed on gas flow, coalbed is considered as double-media composed of rock matrix and cleats. With Weilbulls distribution the heterogeneity of youngs modulus and strength of rock matrix are simulated, and the cleats (fractured media) are simulated with Desai thin elements. Based on elastic-plastic mechanical theory, gas flow theory and double-media model the seepage-stress coupling mathematical model of heterogeneous coalbed is presented, and the numerical code is developed. The effect of different distance of single cleat from gas production well on gas flow is studied. Results show that cleats could accelerate gas production. Especially, the recovery of coalbed methane would significantly be improved when gas production just exists in cleat. Some techniques, such as the hydraulic cutting seam, could enhance gas production. This model is suitable for simulating the effect of a heterogeneous coalbed on gas flow, and a new method of simulating gas flow process is provided as a result.
JIANG-YONG YU GUI-LAI WANG CHUN-HUI ZHANG YANG YANG
College of Mechanics and Engineering, Liaoning Technical University Fuxin, 123000, P.R.China School of Civil Engineering, Hebei University of Science and Technology Shijiazhuang, 050018, P.R.Ch Center for Material Failure Modeling Research, Dalian University Dalian, 116622, P.R.China
国际会议
The 7th International Symposium on Rockburst and Seismicity in Mines(2009年第七届国际岩爆与微振动性学术研讨会)
大连
英文
715-720
2009-08-21（万方平台首次上网日期，不代表论文的发表时间）