Mining-Induced Stress-Fissure Field Evolution and the Disaster-Causing Mechanism in the High Gas Working Face of the Deep Hard Strata

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8849666/figures/8849666.fig.008a.svgz" name="8849666.fig.008a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Before the first breaking of the hard roof</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8849666/figures/8849666.fig.008b.svgz" name="8849666.fig.008b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>After the first breaking of the hard roof</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8849666/figures/8849666.fig.008c.svgz" name="8849666.fig.008c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Before the second breaking of the hard roof</td></tr><tr class="fig-image" id="d"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2020/8849666/figures/8849666.fig.008d.svgz" name="8849666.fig.008d" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(d) </b>After the second breaking of the hard roof</td></tr></table>

<div>Before and after the breaking of a hard roof.</div>

Geofluids

fig8

Figure 8

Figure 8: Mining-Induced Stress-Fissure Field Evolution and the Disaster-Causing Mechanism in the High Gas Working Face of the Deep Hard Strata 