Innovative Control Technique for the Floor Heave in Goaf-Side Entry Retaining Based on Pressure Relief by Roof Cutting

Figure 11

Distribution of vertical stresses in different parts before and after roof cutting. (a) 5 to 20 m behind the working face, (b) 25 to 40 m behind the working face, and (c) 45 to 60 m behind the working face.

(a)

(b)

(c)