Numerical Investigation of Damage Risks of Roadway Surrounding Rocks under Oblique Incident Dynamic Loads

<table class="table-group" id="tab3"><tr><td><table class="table"><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left">Energy level of microearthquake/J</td><td class="align_center">Maximum peak velocity of tremors/(m·s<sup>−1</sup>)</td><td class="align_center">Tremor frequency/Hz</td><td class="align_center">Propagation velocity of <svg height="8.43779pt" id="M59" style="vertical-align:-0.04980946pt" version="1.1" viewbox="-0.0498162 -8.38798 7.44608 8.43779" width="7.44608pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M46 650V622C120 617 128 613 128 525V125C128 42 120 34 40 28V0H311V28C221 34 212 39 212 124V281L286 262C297 261 316 261 331 263C429 275 526 338 526 468C526 533 501 579 462 609C422 638 364 650 293 650H46ZM212 559C212 588 215 600 223 606C230 613 251 618 279 618C361 618 430 572 430 464C430 337 350 302 285 302C252 302 225 309 212 314V559Z" id="g121-78"></path><glyph.data ascent="989" descent="-360" horiz-adv-x="563" vert-adv-y="563"></glyph.data></g></svg>-wave/(m·s<sup>−1</sup>)</td><td class="align_center">Density of coal/(kg·m<sup>−3</sup>)</td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">10<sup>4</sup></td><td class="align_center">3.4</td><td class="align_center">10</td><td class="align_center">3350</td><td class="align_center">1320</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

Relevant parameters of the calculation for <svg height="8.43779pt" id="M58" style="vertical-align:-0.04980946pt" version="1.1" viewbox="-0.0498162 -8.38798 7.44608 8.43779" width="7.44608pt" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink"><g transform="matrix(.013,0,0,-0.013,0,0)"><path d="M46 650V622C120 617 128 613 128 525V125C128 42 120 34 40 28V0H311V28C221 34 212 39 212 124V281L286 262C297 261 316 261 331 263C429 275 526 338 526 468C526 533 501 579 462 609C422 638 364 650 293 650H46ZM212 559C212 588 215 600 223 606C230 613 251 618 279 618C361 618 430 572 430 464C430 337 350 302 285 302C252 302 225 309 212 314V559Z" id="g121-78"></path><glyph.data ascent="989" descent="-360" horiz-adv-x="563" vert-adv-y="563"></glyph.data></g></svg>-wave dynamic loads.

Shock and Vibration

tab3

Table 3

Table 3: Numerical Investigation of Damage Risks of Roadway Surrounding Rocks under Oblique Incident Dynamic Loads 