Vulnerability Analysis of Soft Caving Tunnel Support System and Surrounding Rock Optimal Control Technology Research

<table class="table-group" id="tab7"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td align="left">Name</td><td align="center" colspan="5">Quantitative data and description</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td align="left">Width of pillars (m)</td><td align="center"><svg height="8.9125004" id="M28" style="vertical-align:-0.30096pt" version="1.1" viewbox="0 0 10.1 8.9125004" width="10.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,8.8)"><path d="M512 230l-437 -233v58l378 199v2l-378 200v58l437 -233v-51z" id="x3E"></path></g>
</svg>46</td><td align="center">26<svg height="5.7375002" id="M29" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 10.1 5.7375002" width="10.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,5.675)"><path d="M548 311q-21 -57 -59 -94t-89 -37q-53 0 -128 52q-55 38 -84 38q-39 0 -70.5 -23t-45.5 -60l-32 12q21 57 59 94t89 37q53 0 128 -52q55 -38 84 -38q39 0 70.5 23t45.5 60z" id="x223C"></path></g>
</svg>45</td><td align="center">15<svg height="5.7375002" id="M30" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 10.1 5.7375002" width="10.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,5.675)"><path d="M548 311q-21 -57 -59 -94t-89 -37q-53 0 -128 52q-55 38 -84 38q-39 0 -70.5 -23t-45.5 -60l-32 12q21 57 59 94t89 37q53 0 128 -52q55 -38 84 -38q39 0 70.5 23t45.5 60z" id="x223C"></path></g>
</svg>25</td><td align="center">7<svg height="5.7375002" id="M31" style="vertical-align:-0.0pt" version="1.1" viewbox="0 0 10.1 5.7375002" width="10.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,5.675)"><path d="M548 311q-21 -57 -59 -94t-89 -37q-53 0 -128 52q-55 38 -84 38q-39 0 -70.5 -23t-45.5 -60l-32 12q21 57 59 94t89 37q53 0 128 -52q55 -38 84 -38q39 0 70.5 23t45.5 60z" id="x223C"></path></g>
</svg>14</td><td align="center"><svg height="8.9125004" id="M32" style="vertical-align:-0.30096pt" version="1.1" viewbox="0 0 10.1 8.9125004" width="10.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
<g transform="matrix(.017,-0,0,-.017,.062,8.8)"><path d="M512 -3l-437 233v51l437 233v-58l-378 -200v-2l378 -199v-58z" id="x3C"></path></g>
</svg>6</td></tr><tr><td align="left">Affecting ranks</td><td align="center">Slight</td><td align="center">General</td><td align="center">Medium</td><td align="center">Serious</td><td align="center">Very serious</td></tr><tr><td align="left">Scores</td><td align="center">2</td><td align="center">4</td><td align="center">6</td><td align="center">8</td><td align="center">10</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Quality ranks of coal pillar influence and quantitative scores.

Mathematical Problems in Engineering

tab7

Table 7

Table 7: Vulnerability Analysis of Soft Caving Tunnel Support System and Surrounding Rock Optimal Control Technology Research 