Mechanical and Deformation Characteristics and Optimization of Support Parameters for Superlarge-Span Tunnel: A Case Study from Laohushan Tunnel

<table class="table-group" id="tab1"><tr><td><table class="table"><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Support type</td><td class="align_center" colspan="4">Primary support</td><td class="align_center" rowspan="2">Secondary lining</td></tr><tr class="thead"><td class="align_center">Steel rib</td><td class="align_center">Steel ribs spacing (m)</td><td class="align_center">C25 shotcrete thickness (cm)</td><td class="align_center">Bolt</td></tr><tr><td class="thead-hr" colspan="6"><hr/></td></tr><tr><td class="align_left">Strengthening</td><td class="align_center" rowspan="3">H200 × 200</td><td class="align_center" rowspan="3">0.75</td><td class="align_center" rowspan="3">28</td><td class="align_center" rowspan="3">Local bolts</td><td class="align_center" rowspan="3">C30 concrete 55 cm thick</td></tr><tr><td class="align_left">Section in grade</td></tr><tr><td class="align_left">IV rock mass</td></tr><tr class="table-tr"><td colspan="6"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Advances in Civil Engineering

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Table 1: Mechanical and Deformation Characteristics and Optimization of Support Parameters for Superlarge-Span Tunnel: A Case Study from Laohushan Tunnel 

Table 1 | Mechanical and Deformation Characteristics and Optimization of Support Parameters for Superlarge-Span Tunnel: A Case Study from Laohushan Tunnel 