分级循环荷载下保护层开采扰动煤岩强度及裂隙特性研究
杨永波,周哲

Strength and fracture characteristics of coal rock disturbed by protective layer mining under graded cyclic loading
Yong-bo YANG,Zhe ZHOU
表 1 煤样的三维裂隙分形维数
Tab.1 Three-dimensional fracture fractal dimension of coal sample
L / m 是否受保护层
开采扰动
拟合线性方程 R2 D
96 $y = - 2.169\;6x+8.349\;6$ 0.9999 2.1696
96 $y=-1.996\;0x+8.119\;7$ 0.9998 1.9960
170 $y = - 2.181\;5x+8.453\;2$ 0.9994 2.1815
170 $y = - 1.916\;5x+7.842\;4$ 0.9987 1.9165
255 $y=-2.215\;2x+8.696\;4$ 0.9993 2.2152
255 $y = - 1.912\;1x+7.823\;8$ 0.9995 1.9121
389 $y = - 2.188\;4x+8.726\;4$ 0.9995 2.1884
389 $y = - 1.953\;6x+8.169\;4$ 0.9999 1.9536
495 $y = - 2.217\;8x+8.683\;9$ 0.9999 2.2178
495 $y = - 1.994\;0x+8.343\;6$ 0.9997 1.9940
640 $y = - 2.442\;8x+8.715\;3$ 0.9999 2.4428
640 $y = - 2.087\;5x+8.540\;3$ 0.9997 2.0875
680 $y = - 2.332\;9x+8.698\;1$ 0.9999 2.3329
680 $y = - 2.045\;2x+8.479\;0$ 0.9996 2.0452
834 $y = - 2.250\;6x+8.660\;7$ 0.9995 2.2506
834 $y = - 1.954\;1x+8.430\;1$ 0.9997 1.9541