A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation

<table class="table-group" id="tab9"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left">Width of the protective coal pillar</td><td class="align_left">IV</td><td class="align_left">I</td><td class="align_left">III</td><td class="align_left">II</td><td class="align_center">0 m</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Scores</td><td class="align_center">2</td><td class="align_center">4</td><td class="align_center">6</td><td class="align_center">8</td><td class="align_center">10</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The scores of width of protective pillar in the current coal seam.</div>

Shock and Vibration

tab9

Table 9

Table 9: A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation 