A Study of Fractal Deep-Hole Blasting and Its Induced Stress Behavior of Hard Roof Strata in Bayangaole Coal Mine, China

<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">Mass density (g·cm<sup>−3</sup>)</td><td class="align_center">Elastic modulus (GPa)</td><td class="align_center">Maximum compressive strength (GPa)</td><td class="align_center">Maximum tensile pressure (MPa)</td><td class="align_center">Poisson’s ratio</td><td class="align_center">Accumulated plastic strain before fracture (%)</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">2.131</td><td class="align_center">23</td><td class="align_center">43.94</td><td class="align_center">2.8515</td><td class="align_center">0.2225</td><td class="align_center">0.7</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Medium-grain sandstone blasting parameters.</div>

Advances in Civil Engineering

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Table 5

Table 5: A Study of Fractal Deep-Hole Blasting and Its Induced Stress Behavior of Hard Roof Strata in Bayangaole Coal Mine, China 