Breaking and Instability Movement Characteristics of High-Position Double-Layer Hard Thick Strata due to Longwall Mining

<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">Magmatic rocks</td><td class="align_center">Thickness <i>h</i> (m)</td><td class="align_center">Distance from coal seam 10# ∑<i>H</i> (m)</td><td class="align_center">Distance between two layers (m)</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Upper magmatic rock (UMR)</td><td class="align_center">29</td><td class="align_center">326</td><td class="align_center" rowspan="2">63</td></tr><tr><td class="align_left">Lower magmatic rock (LMR)</td><td class="align_center">31</td><td class="align_center">232</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Parameters of double layers of magmatic rock above panel 1061.</div>

Shock and Vibration

tab1

Table 1

Table 1: Breaking and Instability Movement Characteristics of High-Position Double-Layer Hard Thick Strata due to Longwall Mining 