Gas-solid coupling analysis and numerical simulation of the dynamic process of gas drainage  

作　　者：Kai WANG Bo LI Jian-Ping WEI Peng LI 

机构地区：[1]Faculty of Resources and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China [2]Key Lab of Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454000, China

出　　处：《Journal of Coal Science & Engineering(China)》2013年第2期187-192,共6页煤炭学报（英文版）

基　　金：Supported by the National Natural Science Foundation of China （51174212）; the Program for New Century Excellent Talents in University of China （NCET-10-0724）; the Fundamental Research Funds for the Central Universities （2010QZ05）

摘　　要：Based on the basic theory of gas seepage and coal seam deformation, using the numerical simulation method, this paper established the gas-solid coupling model of gas drainage from borehole. Using multi-physical coupling analysis software, the authors studied the stress change conditions around the drainage borehole, the influence of the gas drainage effect caused by the drilling gap, and the gas drainage effect under the conditions of different borehole radius and different permeabilities. The results show that the effective drainage radius is 1.03 m during 30 days of drainage. The effect of the diameter change of the drainage borehole is limited, but the influence of coal seam permeability is much bigger. After the same drainage period, the greater the permeability of coal seam is, the bigger the drainage radius is. For a low permeability coal seam, coal miners should take pressure-relief measures and increase the permeability to improve the drainage effects before draining gas through drilling.

关 键 词：gas drainage numerical simulation drainage radius stress gas-solid coupling 

分 类 号：TD713.33[矿业工程—矿井通风与安全] TU452[建筑科学—岩土工程]