Model Test Study on Overburden Failure and Fracture Evolution Characteristics of Deep Stope with Variable Length

<div>The three-dimensional space coordinate system in the different layers of the model. (a) 15 cm above the coal seam and (b) 40 cm above the coal seam.</div>

Advances in Civil Engineering

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Figure 4

Figure 4: Model Test Study on Overburden Failure and Fracture Evolution Characteristics of Deep Stope with Variable Length 