Research Article
Study on Failure Characteristics and Reasonable Mining Parameters of Upward Mining of Integrated Coal Mine
Figure 18
The change of plastic zone in two sides of roadway in 302 mining area when the cutting position is 340 m ahead of schedule. (a) Working face advancing 40 m; (b) working face advancing 80 m; (c) working face advancing 120 m; (d) working face advancing 160 m.