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

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Roof type</td><td class="align_center">Rock roof</td><td class="align_center">Coal roof</td><td class="align_center">Composite roof</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Scores</td><td class="align_center">3</td><td class="align_center">6</td><td class="align_center">9</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The scores of roof characteristics.</div>

Shock and Vibration

tab3

Table 3

Table 3: A Study of Safety Coefficient Determination and Support Parameter Optimization Based on Vulnerability Preevaluation 