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

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8883784/figures/8883784.fig.007a.svgz" name="8883784.fig.007a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Three-dimensional schematic diagram</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8883784/figures/8883784.fig.007b.svgz" name="8883784.fig.007b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>The +495 level presplitting blasting scheme</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8883784/figures/8883784.fig.007c.svgz" name="8883784.fig.007c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Presplitting blasting scheme of the +518 level and the +541 level</td></tr></table>

<div>Sublevel advanced presplitting blasting scheme for the top coal in the residual high sectional coal pillar.</div>

Geofluids

fig7

Figure 7

Figure 7: Study on the Characteristics of Top-Coal Caving and Optimization of Recovery Ratio in Steeply Inclined Residual High Sectional Coal Pillar 