Analysis of Overburden Structure and Pressure-Relief Effect of Hard Roof Blasting and Cutting

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">No.</td><td class="align_center">First weighting (m)</td><td class="align_center">Periodic weighting (m)</td><td class="align_center">Support stress (MPa)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">3#</td><td class="align_center">50</td><td class="align_center">31</td><td class="align_center">17.3</td></tr><tr><td class="align_left">51#</td><td class="align_center">40</td><td class="align_center">19</td><td class="align_center">25.9</td></tr><tr><td class="align_left">91#</td><td class="align_center">44</td><td class="align_center">26</td><td class="align_center">21.2</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Statistics of weighting and support stress.</div>

Advances in Civil Engineering

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Table 2

Table 2: Analysis of Overburden Structure and Pressure-Relief Effect of Hard Roof Blasting and Cutting 