Research on Design Parameters and Fatigue Life of Tunnel Bottom Structure of Single-Track Ballasted Heavy-Haul Railway Tunnel with 40-Ton Axle Load

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Measuring point</td><td class="align_center" colspan="4">The vertical dynamic stress amplitude of different surrounding rock grades (kPa)</td></tr><tr class="thead"><td class="align_center">II</td><td class="align_center">III</td><td class="align_center">IV</td><td class="align_center">V</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">1</td><td class="align_center">163.324</td><td class="align_center">161.196</td><td class="align_center">162.393</td><td class="align_center">161.728</td></tr><tr><td class="align_left">2</td><td class="align_center">113.449</td><td class="align_center">96.558</td><td class="align_center">88.844</td><td class="align_center">79.667</td></tr><tr><td class="align_left">3</td><td class="align_center">93.765</td><td class="align_center">66.899</td><td class="align_center">52.402</td><td class="align_center">35.777</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>The vertical dynamic stress amplitude of measuring points 1, 2, and 3 under different surrounding rock grades.</div>

Mathematical Problems in Engineering

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Table 4

Table 4: Research on Design Parameters and Fatigue Life of Tunnel Bottom Structure of Single-Track Ballasted Heavy-Haul Railway Tunnel with 40-Ton Axle Load 

Table 4 | Research on Design Parameters and Fatigue Life of Tunnel Bottom Structure of Single-Track Ballasted Heavy-Haul Railway Tunnel with 40-Ton Axle Load 