Influence of Incremental Impact on the Damage of Coal-Rock under Unidirectional Constraint

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Material</td><td class="align_center">Density (kg·m<sup>−3</sup>)</td><td class="align_center">Elastic modulus (MPa)</td><td class="align_center">Uniaxial compressive strength (MPa)</td><td class="align_center">Porosity (%)</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">Coal</td><td class="align_center">1.312</td><td class="align_center">8948</td><td class="align_center">5.64</td><td class="align_center">28</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The main mechanical parameters of coal sample.</div>

Advances in Civil Engineering

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Table 2

Table 2: Influence of Incremental Impact on the Damage of Coal-Rock under Unidirectional Constraint 