“Relief-Retaining” Control Technology of Floor Heave in Mining Roadway with Soft Rock: A Case Study

Figure 9

Deformation and stress distribution of surrounding rocks in mining roadway with different spacings of pressure relief boreholes. (a) Vertical strain of 0.8 m; (b) vertical stress of 0.8 m; (c) vertical strain of 1.0 m; (d) vertical stress of 1.0 m; (e) vertical strain of 1.2 m; (f) vertical stress 1.2 m.

(a)

(b)

(c)

(d)

(e)

(f)