Roadway Surrounding Rock under Multi-Coal-Seam Mining: Deviatoric Stress Evolution and Control Technology

Figure 10

Nephograms of deviatoric stress and plastic zone of Tailgate 8709 under multi-coal-seam mining: (a) after mining of the N8707 coal face in No. 7-4 coal seam; (b) after mining of the N8709 coal face in No. 7-4 coal seam; (c) after mining of the N8707 coal face in No. 11 coal seam; (d) in the advance 10 m of the N8709 coal face in No. 11 coal seam.

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