Investigation on the Ground Pressure Induced by Hard Roof Fracturing at Different Layers during Extra Thick Coal Seam Mining

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8834235/figures/8834235.fig.007a.svgz" name="8834235.fig.007a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Ground pressure during near field strata breaking</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8834235/figures/8834235.fig.007b.svgz" name="8834235.fig.007b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Ground pressure during far field strata breaking</td></tr></table>

<div>Ground pressure during the breaking of strata at different levels.</div>

Geofluids

fig7

Figure 7

Figure 7: Investigation on the Ground Pressure Induced by Hard Roof Fracturing at Different Layers during Extra Thick Coal Seam Mining 