Influencing Factors’ Analysis of Disturbance Degree of Key Stratum Based on the Response Surface Method

<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">Lithology</td><td class="align_center">Tensile strength <i>R</i><sub>ti</sub> (MPa)</td><td class="align_center">Bulking factor <i>K</i><sub>Pi</sub></td><td class="align_center">Lithological strength coefficient <i>α</i></td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">Soft</td><td class="align_center">1</td><td class="align_center">1.2</td><td class="align_center">1.2</td></tr><tr><td class="align_left">Medium</td><td class="align_center">3</td><td class="align_center">1.3</td><td class="align_center">3.9</td></tr><tr><td class="align_left">Hard</td><td class="align_center">5</td><td class="align_center">1.4</td><td class="align_center">7.0</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Value of lithological strength coefficient.</div>

Advances in Civil Engineering

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Table 1

Table 1: Influencing Factors’ Analysis of Disturbance Degree of Key Stratum Based on the Response Surface Method 