Evaluation of Rock Quality of Tunnel Wall Rock Based on Rough Set Theory and Unascertained Measurement Theory

<table class="fixed-width table-group" id="tab1"><tr><td><table class="table"><colgroup><col style="width:46.72em"/><col style="width:3.53em"/></colgroup><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Structural surface condition</td><td class="align_center">Value</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Thickness of soft rock strata &gt; 5mm, joint width &gt; 5mm and joint is continuous</td><td class="align_center">0~2</td></tr><tr><td class="align_left">Joint surface is smooth or thickness soft rock strata &lt; 5mm, joint opening width is 1~5mm and joint is continuous</td><td class="align_center">2~4</td></tr><tr><td class="align_left">Joint surface is a little rough, joint width &lt; 1mm and rock of joint surface is weak</td><td class="align_center">4~7</td></tr><tr><td class="align_left">Joint surface is a little rough, joint width &lt; 1mm and rock of joint surface is hard</td><td class="align_center">7~9</td></tr><tr><td class="align_left">Joint surface is very rough, joint width is zero, rock of joint surface is hard, the joint surface is discontinuous</td><td class="align_center">9~10</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Classification criteria of the structural surface.</div>

Mathematical Problems in Engineering

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Table 1

Table 1: Evaluation of Rock Quality of Tunnel Wall Rock Based on Rough Set Theory and Unascertained Measurement Theory 