Influence of Cyclic Impact Loading and Axial Stress on Dynamic Mechanical Properties of Burst-Prone Coal

<table class="table-group" id="tab5"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left">Coal source</td><td class="align_center"><i>R</i><sub>min</sub> (%)</td><td class="align_center"><i>R</i><sub>max</sub> (%)</td><td class="align_center"><i>R</i><sub>o</sub>, <sub>max</sub> (%)</td><td class="align_center">|<i>R</i><sub>max</sub>-<i>R</i><sub>min</sub>| (%)</td><td class="align_center">Measuring points</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Qianqiu coal</td><td class="align_center">1.18</td><td class="align_center">1.23</td><td class="align_center">1.21</td><td class="align_center">0.18</td><td class="align_center">20</td></tr><tr><td class="align_left">Zhaogezhuang coal</td><td class="align_center">1.10</td><td class="align_center">1.20</td><td class="align_center">1.15</td><td class="align_center">0.08</td><td class="align_center">20</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr><tr class="table-fn"><td><div>Note: <i>R</i><sub>min</sub>, <i>R</i><sub>max</sub>, and <i>R</i><sub>o</sub>,<sub>max</sub> are, respectively, the minimum, maximum, and average reflectivity of vitrinite.<br/></div></td></tr></table>

<div>Analysis results of vitrinite reflectance ratio in different coal samples.</div>

Shock and Vibration

tab5

Table 5

Table 5: Influence of Cyclic Impact Loading and Axial Stress on Dynamic Mechanical Properties of Burst-Prone Coal 