Advances in Civil Engineering / 2019 / Article / Fig 9

Research Article

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

Figure 9

Principal stress difference distribution between single and double layer mining. (a) #15 coal seam in exploited conditions. (b) #15 coal seam in unexploited conditions.
(a)
(b)

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