Research on Physical Similarity Simulation of Mining Uphill and Downhill at the Large-Angle Working Face

<div>First caving of the immediate roof. (a) State before the roof collapses. (b) Caving of the immediate roof. (c) Vertical microfractures development.</div>

Advances in Civil Engineering

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Figure 4

Figure 4: Research on Physical Similarity Simulation of Mining Uphill and Downhill at the Large-Angle Working Face 