Open Access

ARTICLE

Numerical Simulation of Coal Deformation and Gas Flow Properties Around Borehole for Coal and Gas Outbursts

Yi Xue^1,2,3

1 State Key Laboratory Base of Eco-Hydraulic Engineering in Arid Areas, Xi’an University of Technology, Xi’an 710048, China
2 Institute of Geotechnical Engineering, Shaanxi Provincial Key Laboratory of Loess Mechanics and Engineering, Xi’an University of Technology, Xi’an 710048, China
3 Corresponding author, E-mail address: xueyi@xaut.edu.cn.

Computer Modeling in Engineering & Sciences 2017, 113(4), 429-441. https://doi.org/10.3970/cmes.2017.113.429

Abstract

The lack of research on the effect of diffusion on methane extraction leads to low methane concentration and low utilization. The Comsol Multiphysics software is used to solve the numerical gas and solid coupled model which considers the diffusion of coal matrix, fracture seepage, permeability evolution and coal deformation. The simulation results reveal the effect of diffusion process on methane migration. The gas diffusion rate is relatively high in the initial stage. With the increase in time, the difference between coal fractures and coal matrix blocks becomes lower and the gas diffusion rate decreases gradually. The gas seepage rate decreases significantly near the borehole and the decrease degree becomes small when it is far away from borehole. The influence of diffusion time on gas drainage rate is not obvious.

---

Keywords

---