Analysis and Monitoring Technology of Upper Seam Mining in Multiunderlayer Goaf

Figure 12

The profile of 1359P maingate. (a) Underlying coal mass (40 m from open cut). (b) Over 2072P gob (1730 m from open cut). (c) Over pillar between 2072P and 2071P (268 m from open cut). (d) Over 2071P gob (357 m from open cut). (e) Over pillar between 2071P and 1378P (455 m from open cut). (f) Over 1378P gob (502 m from open cut).

(a)

(b)

(c)

(d)

(e)

(f)