Gob-Side Entry Retaining Technology with Advanced Empty Hole Butterfly-Shaped Weakening in Three-Soft Coal Seam in China

<div>Model of empty hole weakening in gob-side entry retaining.</div>

Advances in Materials Science and Engineering

Figure 1: Gob-Side Entry Retaining Technology with Advanced Empty Hole Butterfly-Shaped Weakening in Three-Soft Coal Seam in China 