Risk Assessment System Based on Fuzzy Composite Evaluation and a Backpropagation Neural Network for a Shield Tunnel Crossing under a River

<table class="table-group" id="tab2"><tr><td><table class="table"><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr class="thead"><td class="align_left">Category</td><td class="align_center">Construction risk level for tunnel under river</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">Combined risk indicators</td><td class="align_center">Water surges; landslides</td></tr><tr><td class="align_left">Single risk indicator</td><td class="align_center">Plastic-zone extent; vault settlement; surface settlement; riverbed settlement</td></tr><tr><td class="align_left">Risk factor</td><td class="align_center">Level of surrounding rock; depth of tunnel; depth of water coverage; excavation method; strength of synchronized slurries; strength of secondary grouting; grouting pressure; soil bin pressure</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Risk assessment indicators for tunnel crossing under a river.</div>

Advances in Civil Engineering

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Table 2

Table 2: Risk Assessment System Based on Fuzzy Composite Evaluation and a Backpropagation Neural Network for a Shield Tunnel Crossing under a River 