Research Article
Research on the Rock Pressure Behavior at Close-Distance Island Working Faces under Deep Goaf
Figure 12
The variation curve of principal stress and the distance from the roof of the goaf (inclination direction): (a) the working face advances 80 m, (b) the working face advances 130 m, (c) the working face advances 180 m, and (d) the working face advances 240 m.
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(b) |
(c) |
(d) |