Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining

<div>Relationship between function coefficients of hard and soft coal. (a) Hard coal failure factor (<i>i</i>) function in hard coal gangue. (b) Soft coal fracture factor (<span class="nowrap"><svg height="11.6425pt" id="M44" style="vertical-align:-0.2063999pt" version="1.1" viewbox="-0.0498162 -11.4361 7.45746 11.6425" width="7.45746pt" 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="M244 607C244 633 228 655 200 655C166 655 146 618 146 594C146 564 166 546 191 546C221 546 244 574 244 607ZM222 91L209 114C184 94 148 66 133 66C127 66 124 73 130 96L201 370C213 416 211 448 191 448C162 448 88 407 29 352L42 328C73 354 104 371 114 371C120 371 119 365 115 345L53 92C32 5 45 -12 68 -12C103 -12 186 50 222 91Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,3.549,-5.741)"><path d="M310 541L304 571C290 586 211 619 185 610L80 76L131 52L310 541Z"></path></g></svg>)</span> function.</div>

Shock and Vibration

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Figure 2

Figure 2: Study on Roof-Coal Caving Characteristics with Complicated Structure by Fully Mechanized Caving Mining 