Optimization Analysis of Deformation of Underlying Tunnel in Dewatering and Excavation of Phreatic Aquifer

<table class="table-group" id="tab4"><tr><td><table class="table"><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="2">Well combination</td><td class="align_center" colspan="3">Calculated permeability coefficient (m/d)</td></tr><tr class="thead"><td class="align_center">Step 1</td><td class="align_center">Step 2</td><td class="align_center">Step 3</td></tr><tr><td class="thead-hr" colspan="4"><hr/></td></tr><tr><td class="align_left">One pumping well</td><td class="align_center">15.56</td><td class="align_center">11.48</td><td class="align_center">13.63</td></tr><tr><td class="align_left">Two observation wells</td><td class="align_center">35.12</td><td class="align_center">31.26</td><td class="align_center">21.23</td></tr><tr class="table-tr"><td colspan="4"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Analysis and calculation results of two well combinations.</div>

Advances in Materials Science and Engineering

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Table 4

Table 4: Optimization Analysis of Deformation of Underlying Tunnel in Dewatering and Excavation of Phreatic Aquifer 