Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams

<table class="table-group" id="tab6"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Parameter</td><td class="align_center"><i>γ</i> (kg/m<sup>3</sup>)</td><td class="align_center"><i>G</i> (GPa)</td><td class="align_center"><i>K</i> (GPa)</td><td class="align_center"><i>φ</i> (°)</td><td class="align_center"><i>σ</i><sub><i>t</i></sub> (MPa)</td></tr><tr><td class="align_left" colspan="6"><hr/></td></tr><tr><td class="align_left">Value</td><td class="align_center">1340</td><td class="align_center">1.15</td><td class="align_center">3.74</td><td class="align_center">27</td><td class="align_center">0</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Shock and Vibration

tab6

Table 6

Table 6: Failure Mechanism and Control of Lower Retracement Channel in Close-Distance Double-Thick Coal Seams 