Burst Failure Characteristics and Energy Evolution Law of Coal with Prefabricated Cracks at Different Angles

<table class="table-group" id="tab6"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Micromechanical parameters</td><td class="align_center">Value</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Minimum/maximum particle radius (mm)</td><td class="align_center">0.004/0.005</td></tr><tr><td class="align_left">Particle density (kg/m<sup>3</sup>)</td><td class="align_center">1700.0</td></tr><tr><td class="align_left">Normal/tangential contact damping</td><td class="align_center">0.7/0.5</td></tr><tr><td class="align_left">Coefficient of friction</td><td class="align_center">0.8</td></tr><tr><td class="align_left">Parallel bond effective modulus (GPa)</td><td class="align_center">1.7</td></tr><tr><td class="align_left">Parallel bond normal strength (MPa)</td><td class="align_center">14.0</td></tr><tr><td class="align_left">Parallel bond tangential strength (MPa)</td><td class="align_center">13.0</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Micromechanical parameters of coal samples.</div>

Shock and Vibration

tab6

Table 6

Table 6: Burst Failure Characteristics and Energy Evolution Law of Coal with Prefabricated Cracks at Different Angles 