Study on Supporting Protection of Tunnel Opening near a Rock Layer under Elastic Deformation of Surrounding Rock

<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">Surrounding rock level</td><td class="align_center">Section spacing</td></tr><tr><td class="thead-hr" colspan="2"><hr/></td></tr><tr><td class="align_left">II</td><td class="align_center">According to the specific situation</td></tr><tr><td class="align_left">III</td><td class="align_center">30~50 m</td></tr><tr><td class="align_left">IV</td><td class="align_center">10~30 m</td></tr><tr><td class="align_left">V</td><td class="align_center">5~10 m</td></tr><tr class="table-tr"><td colspan="2"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Principles for selecting monitoring surfaces.</div>

Geofluids

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Table 2

Table 2: Study on Supporting Protection of Tunnel Opening near a Rock Layer under Elastic Deformation of Surrounding Rock 