Advances in Materials Science and Engineering

Research Article

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

Table 5

Simulation scheme with different hole spacings.
Scheme (MPa)η (MPa)Pore diameter D (cm)Hole spacing L (m)
11.02.32.340.3
20.4
30.5
40.6