Study on Stability of Shield Tunnel Excavation Face in Soil-Rock Composite Stratum

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Stratigraphic combination</td><td class="align_center" rowspan="2">Calculation theory of overburden Earth pressure</td><td class="align_center" rowspan="2">Vertical overburden Earth pressure (kPa)</td><td class="align_center" colspan="2">Limit support pressure (kPa)</td></tr><tr class="thead"><td class="align_center">Calculation model results</td><td class="align_center">Numerical simulation results</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">Clay</td><td class="align_center">Theory of fully covered soil</td><td class="align_center">126.08</td><td class="align_center">53.83</td><td class="align_center" rowspan="2">4.68</td></tr><tr><td class="align_left">Moderately weathered limestone</td><td class="align_center">Terzaghi’s theory of loose Earth pressure</td><td class="align_center">29.29</td><td class="align_center">8.26</td></tr><tr><td class="align_left" colspan="5"><hr/></td></tr><tr><td class="align_left">Clay</td><td class="align_center">Theory of fully covered soil</td><td class="align_center">126.08</td><td class="align_center">50.42</td><td class="align_center" rowspan="2">4.90</td></tr><tr><td class="align_left">Strongly weathered mudstone</td><td class="align_center">Terzaghi’s theory of loose Earth pressure</td><td class="align_center">35.17</td><td class="align_center">3.71</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Comparison between numerical simulation results of soil-rock composite stratum and wedge calculation model.</div>

Mathematical Problems in Engineering

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Table 2

Table 2: Study on Stability of Shield Tunnel Excavation Face in Soil-Rock Composite Stratum 