Advances in Civil Engineering / 2019 / Article / Fig 7

Research Article

Research on Failure Mechanism and Strengthening of Broken Roadway Affected by Upper Coal Pillar

Figure 7

Distribution of principal stress difference under the upper coal floor. (a) #16 coal seam floor. (b) #16 coal seam roof. (c) 7 m above #16 coal seam. (d) 14 m above #16 coal seam.

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