Simulation Study on Propagation Law of Double-hole Permeability Improvement Cracks with Joints
WANG Wencai
WANG Zheng
ZHANG An
LI Yumeng
Abstract：To study the crack propagation laws of high-energy gas impact permeability improvement technology at different hole spacings and joint angles, improve the efficiency of gas extraction in low permeability coal seam, RFPA2D-dynamic numerical calculation is used to establish a double-hole permeability improvement model. The effects of different hole spacings and joint angle on crack propagation in three stages before, during and after permeability improvement impact were analyzed and compared. The results show that the spacing of holes has a great influence on the middle and later stages of permeability improvement impact, and different joint angles have different effects on the direction of crack expansion, the mode of connection between cracks and the degree of joint end damage.
Keywords：impact permeability enhancementlow permeability coal seamextraction efficiencydouble hole spacingjoint anglecrack propagation
Publication Date：2019-01-01
Pages：4( 21-24 )