Mechanism of Roof Shock in Longwall Coal Mining under Surface Gully

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/sv/volume-2015/803071/figures/803071.fig.009a.svgz" name="803071.fig.009a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Mining in the downslope direction</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/sv/volume-2015/803071/figures/803071.fig.009b.svgz" name="803071.fig.009b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Mining in the upslope direction</td></tr></table>

<div>The failure status when mining under gully.</div>

Shock and Vibration

fig9

Figure 9

Figure 9: Mechanism of Roof Shock in Longwall Coal Mining under Surface Gully 