Effect of Mining Thickness on Overburden Movement and Underground Pressure Characteristics for Extrathick Coal Seam by Sublevel Caving with High Bottom Cutting Height

<div>Variety of overlying strata convergence with advance of working face in different thick coal seams. (a) 9.0 m; (b) 15.0 m; (c) 25 m.</div>

Advances in Civil Engineering

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Figure 9

Figure 9: Effect of Mining Thickness on Overburden Movement and Underground Pressure Characteristics for Extrathick Coal Seam by Sublevel Caving with High Bottom Cutting Height 

Figure 9 | Effect of Mining Thickness on Overburden Movement and Underground Pressure Characteristics for Extrathick Coal Seam by Sublevel Caving with High Bottom Cutting Height 