Non-linear Response of Acoustic Emission and Electric Potential During Creep Failure of Coal under Stepwise Increasing Loads: Insights from Multifractal Theory

Dongming Wang, Enyuan Wang, Xiaofei Liu, Xiaojun Feng, Mingyao Wei, Dexing Li, Baolin Li, Quanlin Liu, Xin Zhang, Hengze Yang, Changfang Guo