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

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Specimen types</td><td class="align_center">Average value</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Complete cylinder</td><td class="align_center">19.22</td></tr><tr><td class="align_left">0° cracked cylinder</td><td class="align_center">8.85</td></tr><tr><td class="align_left">30° cracked cylinder</td><td class="align_center">11.1</td></tr><tr><td class="align_left">60° cracked cylinder</td><td class="align_center">14.53</td></tr><tr><td class="align_left">90° cracked cylinder</td><td class="align_center">16.94</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Burst energy velocity index of coal under different crack angles.</div>

Shock and Vibration

tab5

Table 5

Table 5: Burst Failure Characteristics and Energy Evolution Law of Coal with Prefabricated Cracks at Different Angles 