Study on the Damage Model of Coal Rock Caused by Hydraulic Pressure and Electrical Impulse in Borehole

<table class="figure-group"><tr class="fig-image" id="a"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/6627242/figures/6627242.fig.0010a.svgz" name="6627242.fig.0010a" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(a) </b>7 kV voltages</td></tr><tr class="fig-image" id="b"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/6627242/figures/6627242.fig.0010b.svgz" name="6627242.fig.0010b" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(b) </b>9 kV voltages</td></tr><tr class="fig-image" id="c"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/6627242/figures/6627242.fig.0010c.svgz" name="6627242.fig.0010c" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(c) </b>11 kV voltages</td></tr><tr class="fig-image" id="d"><td><object data="https://static.hindawi.com/articles/geofluids/volume-2021/6627242/figures/6627242.fig.0010d.svgz" name="6627242.fig.0010d" type="image/svg+xml"></object></td></tr><tr class="fig-caption"><td><b>(d) </b>13 kV voltages</td></tr></table>

<div>Opening degree of crack at 3 MPa hydrostatic pressure and different voltages.</div>

Geofluids

fig10

Figure 10

Figure 10: Study on the Damage Model of Coal Rock Caused by Hydraulic Pressure and Electrical Impulse in Borehole 