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

Advances in Civil Engineering

fig9

Figure 9

Figure 9: 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 9 | Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam 