Numerical simulation research on dynamical variation of permeability of coal around roadway based on gas-solid coupling model for gassy coal

作     者：Tao Yang Bo Li Qiusheng Ye 

作者机构：School of Safety Science and EngineeringNorth China Institute of Science and TechnologyBeijing 101601China State Key Laboratory of Coal Resources and Safe Mining(China University of Mining and Technology)China School of Safety Science and EngineeringHenan Polytechnic UniversityJiaozuo 454003China Hebei State Key Laboratory of Mine Disaster PreventionNorth China Institute of Science and TechnologyBeijing 101601China 

出 版 物：《International Journal of Mining Science and Technology》 (矿业科学技术学报（英文版）)

年 卷 期：2018年第28卷第6期

页      面：925-932页

核心收录：

学科分类：0819[工学-矿业工程] 08[工学] 

基　　金：the financial support from the National Natural Science Foundation for Young Scientists of China (Nos.51604116 and 51604096) Natural Science Foundation ofHenbei Province (No.E2016508036) Hebei State Key Laboratory of Mine Disaster Prevention (No.KJZH2017K08) Basic and Frontier Technology Research Project of Henan Province in 2016 (No.162300410031) 

主　　题：Coupled model Permeability Roadway Numerical simulation Gassy coal 

摘      要：Due to the change of initial stress state caused by roadway excavation, the permeability of the coal body may be changed during the excavation process. In this paper, according to the different stress states, the coal around the roadway was divided into the seepage open zone, seepage orientation zone, seepage decay zone and original seepage zone along the radial direction of the roadway. The loaded gassy coal was treated as a viscoelastic and plastic softened medium, and the mechanical behaviors of the viscoelastic zone, plastic softened zone and broken zone around the roadway were analyzed with the consideration of the loading creep, softening and expansion effect of the gassy coal. According to the law of conservation of mass and the Darcy law, the flow-solid coupled model for the gas transportation of the coal around the roadway was established considering the dynamic evolution of the adsorption characteristics, porosity and permeability of the coal, and the simulation software COMSOL was utilized to numerically simulate the stress state and gas flow regularity around the coal, which provided meaningful reference for investigating the stability of the coal and rock around the roadway.