Rotational Failure Mechanism for Face Stability of Circular Shield Tunnels in Frictional Soils

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2"> </td><td class="align_center" colspan="2">Wong and Subrin [<a href="/journals/ace/2019/7167802/#B29" target="_blank">29</a>]</td><td class="align_center">This study</td></tr><tr class="thead"><td class="align_center">UB solution</td><td class="align_center">FD solution</td><td class="align_center">UB solution</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left"><i>φ</i> = 10°</td><td class="align_center">0.599</td><td class="align_center">0.640</td><td class="align_center">0.722</td></tr><tr><td class="align_left"><i>φ</i> = 20°</td><td class="align_center">0.250</td><td class="align_center">0.255</td><td class="align_center">0.313</td></tr><tr><td class="align_left"><i>φ</i> = 30°</td><td class="align_center">0.133</td><td class="align_center">0.130</td><td class="align_center">0.154</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Comparison of the calculated values of <i>σ</i><sub>tc</sub>/<i>γD</i> between this study and Wong and Subrin [<a href="/journals/ace/2019/7167802/#B29" target="_blank">29</a>] for tunnels in purely frictional soils.</div>

Advances in Civil Engineering

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Table 2

Table 2: Rotational Failure Mechanism for Face Stability of Circular Shield Tunnels in Frictional Soils 