Deviatoric Stress Evolution Laws and Control in Surrounding Rock of Soft Coal and Soft Roof Roadway under Intense Mining Conditions

Figure 9

Deviatoric stress distribution of surrounding rock of gas tailgate when the working face is at a certain position. (a) 40 m advancement of the working face. (b) 80 m advancement of the working face. (c) 160 m advancement of the working face (unit: MPa).

(a)

(b)

(c)