Fracture Mechanism in Overlying Strata during Longwall Mining

<div>The influence of <i>q</i><sub>2</sub> on the fracture of KS: (a) the result of yield criterion changing with <i>q</i><sub>2</sub>; (b) the curve of <svg height="11.9453pt" id="M66" style="vertical-align:-3.309401pt" version="1.1" viewbox="-0.0498162 -8.6359 13.0423 11.9453" width="13.0423pt" 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="M541 160L512 170C485 116 462 88 439 67C411 41 376 35 318 35C272 35 238 37 224 48C207 61 205 85 212 121L290 533C305 611 308 615 391 622L397 650H139L133 622C217 615 221 612 206 533L126 118C111 41 103 34 23 26L17 0H474C489 31 528 124 541 160Z"></path></g><g transform="matrix(.0091,0,0,-0.0091,8.294,3.132)"><path d="M219 86C216 168 211 250 206 337C201 410 189 448 163 448C131 448 79 396 43 344L60 322C91 359 110 375 118 375S132 358 136 298C141 238 152 81 155 -12H182C242 62 331 177 390 258C435 321 451 360 451 391C450 424 432 448 408 448C390 448 372 435 366 419C362 410 362 401 366 394C373 383 376 367 376 350C376 283 262 138 221 86H219Z"></path></g></svg> changing with <i>q</i><sub>2</sub>.</div>

Shock and Vibration

Fracture Mechanism in Overlying Strata during Longwall Mining

Figure 11