Research on Pressure Relief Method of Close Floor Roadway in Coal Seam Based on Deformation and Failure Characteristics of Surrounding Rock in Deep Roadway

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Mine</td><td class="align_center" rowspan="2">Floor roadway number</td><td class="align_center" colspan="3">Distance from investigation site to head-on/m</td><td class="align_center" rowspan="2">Diameter of drill hole/mm</td><td class="align_center" rowspan="2">Investigation content</td></tr><tr class="thead"><td class="align_center">Group 1</td><td class="align_center">Group 2</td><td class="align_center">Group 3</td></tr><tr><td class="thead-hr" colspan="7"><hr/></td></tr><tr><td class="align_left">Qujiang</td><td class="align_center">213</td><td class="align_center">244</td><td class="align_center">208</td><td class="align_center">116</td><td class="align_center">32</td><td class="align_center">Displacement and failure of the surrounding rock and gas flow in the drill hole</td></tr><tr class="table-tr"><td colspan="7"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Investigation sites of pressure relief effect.</div>

Geofluids

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Table 2: Research on Pressure Relief Method of Close Floor Roadway in Coal Seam Based on Deformation and Failure Characteristics of Surrounding Rock in Deep Roadway 

Table 2 | Research on Pressure Relief Method of Close Floor Roadway in Coal Seam Based on Deformation and Failure Characteristics of Surrounding Rock in Deep Roadway 