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.005a.svgz" name="8834235.fig.005a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Strain of coal body during KS1 fracturing</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8834235/figures/8834235.fig.005b.svgz" name="8834235.fig.005b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Strain of coal body during KS2 fracturing</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8834235/figures/8834235.fig.005c.svgz" name="8834235.fig.005c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Strain of coal body during KS3 fracturing</td></tr><tr class="fig-image" id="d"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8834235/figures/8834235.fig.005d.svgz" name="8834235.fig.005d" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(d) </b>Strain of coal body during KS4 fracturing</td></tr><tr class="fig-image" id="e"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8834235/figures/8834235.fig.005e.svgz" name="8834235.fig.005e" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(e) </b>Strain of coal body during KS5 fracturing</td></tr></table>

<div>Strain of coal body during fracturing of different key strata.</div>

Geofluids

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Figure 5

Figure 5: Investigation on the Ground Pressure Induced by Hard Roof Fracturing at Different Layers during Extra Thick Coal Seam Mining 