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

图 4 距开切眼255 m的煤样偏应力-应变曲线

Fig.4 Deviatoric stress-strain curve of coal samples 255 m from open-off cut