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

<div>The measuring instrument for the experiment: (a) strain gauge; (b) DH3816 static strain testing system; (c) electronic theodolite.</div>

Advances in Civil Engineering

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Figure 8

Figure 8: Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams 

Figure 8 | Analysis of Dynamic Evolution of Surrounding Rock Movement and Stress-Fracture in the Upward and Repeated Mining of Close-Distance Coal Seams 