Study on the Instability Characteristics and Bolt Support in Deep Mining Roadways Based on the Surrounding Rock Stability Index: Example of Pansan Coal Mine

Figure 5

Contour map of SRSI at different distances from the working face. (a) l = 30 m. (b) l = 60 m. (c) l = 80 m. (d) l = 100 m. (e) l = 120 m. (f) l = 160 m. (g) l = 200 m. (h) l = 250 m. (i) l = 300 m.

(a)

(b)

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(i)