Evaluation Method of Floor Heave Damage Degree and a Case Study in Zaoquan Coal Mine, China

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left"><i>R</i><sub>c</sub>/MPa</td><td class="align_center">Less than 5</td><td class="align_center">5–15</td><td class="align_center">15–30</td><td class="align_center">30–60</td><td class="align_center">More than 60</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Description of hardness</td><td class="align_center">Very soft rock</td><td class="align_center">Soft rock</td><td class="align_center">Relatively soft rock</td><td class="align_center">Relatively hard rock</td><td class="align_center">Very hard rock</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Relationship between saturated uniaxial compressive strength <i>R</i><sub>C</sub> and rock hardness.</div>

Shock and Vibration

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Table 4

Table 4: Evaluation Method of Floor Heave Damage Degree and a Case Study in Zaoquan Coal Mine, China 