Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam

<div>Horizontal stresses of pressure relief boreholes. (a) Φ100 mm. (b) Φ200 mm. (c) Φ300 mm.</div>

Advances in Civil Engineering

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Figure 8

Figure 8: Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam 

Figure 8 | Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam 