Research on Optimization of Large Flow Hydraulic Punching Process in Zhaozhuang Mine

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2022/7535215/figures/7535215.fig.0021a.svgz" name="7535215.fig.0021a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>Before and after punching for observation borehole 1-4#</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2022/7535215/figures/7535215.fig.0021b.svgz" name="7535215.fig.0021b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>Before and after punching for observation borehole</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2022/7535215/figures/7535215.fig.0021c.svgz" name="7535215.fig.0021c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>Before and after punching for observation borehole 3-3#</td></tr></table>

<div>Gas extraction volume and concentration from boreholes used for observation in tests investigating the radius of influence of a punched borehole.</div>

Geofluids

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Figure 21

Figure 21: Research on Optimization of Large Flow Hydraulic Punching Process in Zhaozhuang Mine 