Analysis of the Influence of Upper Protective Layer Mining on the Effect of Pressure Relief and Protection of Coal and Rock Masses between the Lower Overburden Layers

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Stress concentration coefficient, <i>k</i></td><td class="align_center">Elastic modulus, <i>E</i> (GPa)</td><td class="align_center">Coal thickness, <i>h</i> (m)</td><td class="align_center">Interbed spacing, <i>H</i> (m)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">1.5</td><td class="align_center">0.5</td><td class="align_center">2</td><td class="align_center">5</td></tr><tr><td class="align_left">2</td><td class="align_center">1</td><td class="align_center">3</td><td class="align_center">13</td></tr><tr><td class="align_left">2.5</td><td class="align_center">1.5</td><td class="align_center">4</td><td class="align_center">21</td></tr><tr><td class="align_left">3</td><td class="align_center">2</td><td class="align_center">5</td><td class="align_center">25</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Values of different influencing factors.</div>

Advances in Civil Engineering

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Table 1

Table 1: Analysis of the Influence of Upper Protective Layer Mining on the Effect of Pressure Relief and Protection of Coal and Rock Masses between the Lower Overburden Layers 

Table 1 | Analysis of the Influence of Upper Protective Layer Mining on the Effect of Pressure Relief and Protection of Coal and Rock Masses between the Lower Overburden Layers 