Evaluation of the Adaptability of an EPB TBM to Tunnelling through Highly Variable Composite Strata

<table class="table-group" id="tab12"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Outer diameter of shield (m)</td><td class="align_center" colspan="3">Number of constructed tunnels</td></tr><tr class="thead"><td class="align_center">25 mm</td><td class="align_center">30 mm</td><td class="align_center">40 mm</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">&lt;3</td><td class="align_center">93</td><td class="align_center">7</td><td class="align_center">0</td></tr><tr><td class="align_left">3–5</td><td class="align_center">63</td><td class="align_center">34</td><td class="align_center">2</td></tr><tr><td class="align_left">5–7</td><td class="align_center">89</td><td class="align_center">11</td><td class="align_center">0</td></tr><tr><td class="align_left">&gt;7</td><td class="align_center">25</td><td class="align_center">25</td><td class="align_center">50</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Case values of the shield tail void [<a href="/journals/mpe/2021/5558833/#B37" target="_blank">37</a>].</div>

Mathematical Problems in Engineering

tab12

Table 12

Table 12: Evaluation of the Adaptability of an EPB TBM to Tunnelling through Highly Variable Composite Strata 