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>Tensile test curve of the double-bubble yielding bolt. A: elastic deformation section of the yielding bolt; B: yielding section of the bolt rod; C: deformation yield section of bubble 1; D: deformation yield section of bubble 2; E: reinforcement deformation section of the bolt rod; F: fracture section of the bolt rod.</div>

Advances in Civil Engineering

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Figure 15

Figure 15: 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 15 | Study on the “Pressure Relief and Yielding Support” Joint Prevention and Control Technology for the Weak Impact Roadway in the Extremely Thick Coal Seam 