General-Variable Order Fractional Creep Constitutive Model for Cemented Backfill Materials: Considerations of Particle Size, Dosage, and Confining Pressure Journal title: GeoStruct Innovations Authors: Jiangyu Wu, Yiying Feng, Yiming Wang, Hongwen Jing, Hai Pu, Qian Yin, Dan Ma Subject(s): Geology, Geotechnical Engineering, Structural Geology