The Law of Fracture Evolution of Overlying Strata and Gas Emission in Goaf under the Influence of Mining

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2021/2752582/figures/2752582.fig.0012a.svgz" name="2752582.fig.0012a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Gas extraction concentration of the borehole</td></tr><tr class="fig-image" id="b"><td><object data="https://static-preview.hindawi.com/articles/geofluids/volume-2021/2752582/figures/2752582.fig.0012b.svgz" name="2752582.fig.0012b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Gas extraction purity of the borehole</td></tr></table>

<div>Extraction effect of the high-level directional long borehole.</div>

Geofluids

fig12

Figure 12

Figure 12: The Law of Fracture Evolution of Overlying Strata and Gas Emission in Goaf under the Influence of Mining 