Research Article

Study on the Characteristics of Top-Coal Caving and Optimization of Recovery Ratio in Steeply Inclined Residual High Sectional Coal Pillar

Figure 7

Sublevel advanced presplitting blasting scheme for the top coal in the residual high sectional coal pillar.
(a) Three-dimensional schematic diagram
(b) The +495 level presplitting blasting scheme
(c) Presplitting blasting scheme of the +518 level and the +541 level