Study on Reasonable Layout of Upper Protective Layer for Prevention Rock Burst under Coal Seam Group with Close Quarters Conditions

Figure 10

The vertical stress distribution behaviors of cross section during stage I. (a) The mining face of panel 3203 advances to a distance of 90 m, (b) the mining face of panel 3203 advances to a distance of 180 m, (c) the mining face of panel 3203 advances to a distance of 270 m.

(a)

(b)

(c)