Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining

<table class="table-group" id="tab9"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left">Roof and bottom name</td><td class="align_center">Rock name</td><td class="align_center">Thickness (m)</td><td class="align_center">Lithologic characteristics</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Basic roof</td><td class="align_center">Sandstone</td><td class="align_center">10.91</td><td class="align_center">Gray siltstone, deep gray mudstone with gray and white coarse sand layer</td></tr><tr><td class="align_left">Immediate roof</td><td class="align_center">Mudstone coal rock interbedding</td><td class="align_center">1.57</td><td class="align_center">Grayish white coarse sandstone with dark mudstone, muddy cement, loose</td></tr><tr><td class="align_left">False roof</td><td class="align_center">Mudstone</td><td class="align_center">1.07</td><td class="align_center">Dark gray, gray-black mudstone with a thin layer of mudstone in the lower middle</td></tr><tr><td class="align_left">Direct bottom</td><td class="align_center">Mudstone</td><td class="align_center">1.29</td><td class="align_center">Black thick mudstone</td></tr><tr><td class="align_left">Previous bottom</td><td class="align_center">Mudstone</td><td class="align_center">4.9</td><td class="align_center">Gray-black, brown-gray mudstone, lump</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Coal seam roof and bottom conditions on N101 working face.</div>

Shock and Vibration

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Table 9

Table 9: Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining 