Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams

<div>Vertical displacement of upper coal seam with different face advance of lower coal seam: (a) vertical displacement of points 1–6, 2−6, and 3–6; (b) vertical displacement of line 4.</div>

Advances in Civil Engineering

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Figure 11

Figure 11: Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams 

Figure 11 | Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams 