Quantitative Evaluation of Top Coal Caving Methods at the Working Face of Extra-Thick Coal Seams Based on the Random Medium Theory

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr class="thead"><td class="align_left"> </td><td class="align_center">Interval symmetrical caving</td><td class="align_center">Single-port multiround sequential caving</td></tr><tr><td class="thead-hr" colspan="3"><hr/></td></tr><tr><td class="align_left">Top coal discharge/kg</td><td class="align_center">67.41</td><td class="align_center">50.35</td></tr><tr><td class="align_left">Recovery rate/%</td><td class="align_center">95%</td><td class="align_center">78%</td></tr><tr><td class="align_left">Caving time/s</td><td class="align_center">105024 s</td><td class="align_center">129600 s</td></tr><tr class="table-tr"><td colspan="3"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Performance of different coal caving methods.</div>

Advances in Civil Engineering

tab3

Table 3

Table 3: Quantitative Evaluation of Top Coal Caving Methods at the Working Face of Extra-Thick Coal Seams Based on the Random Medium Theory 