Mining-Induced Pressure-Relief Mechanism of Coal-Rock Mass for Different Protective Layer Mining Modes

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Parameter</td><td class="align_center"><i>k</i></td><td class="align_center"><i>b</i></td><td class="align_center"><i>R</i></td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Peak strength (<i>σ</i><sub>1</sub>)</td><td class="align_center">1.964</td><td class="align_center">63.653</td><td class="align_center">0.979</td></tr><tr><td class="align_left">Peak strain (<i>ε</i><sub>1</sub>)</td><td class="align_center">0.212</td><td class="align_center">-0.963</td><td class="align_center">0.997</td></tr><tr><td class="align_left">Reduced value of confining pressure (Δ<i>P</i>)</td><td class="align_center">0.407</td><td class="align_center">2.887</td><td class="align_center">0.963</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div><i>k</i>, <i>b</i>, and correlation coefficients.</div>

Advances in Materials Science and Engineering

tab3

Table 3

Table 3: Mining-Induced Pressure-Relief Mechanism of Coal-Rock Mass for Different Protective Layer Mining Modes 