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

<div>Dynamic evolution laws of overburden movement and fracture with different distances of lower coal seam advancement: (a) 40 m; (b) 50 m; (c) 75 m; (d) 80 m; (e) 90 m; (f) 140 m.</div>

Advances in Civil Engineering

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Figure 9

Figure 9: Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams 

Figure 9 | Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams 