“…Recent years has witnessed extensive researches on the mechanical properties of coal rock under water interaction. For varying-MC coal rock samples (i.e., coal rock samples that contain varying contents of moisture), the quantitative relation between MC and macroscopic mechanical parameters (such as cohesion, elastic modulus, internal friction angle and uniaxial compressive strength) was obtained in uniaxial compression tests (Erguler and Ulusay, 2009; Hawkins and McConnell, 1992; Song et al., 2022; Yang et al., 2018; Yao et al., 2016) and shear tests (Li et al., 2020; Yao et al., 2020, 2021). It was found that the peak stress, internal friction angle, cohesion and elastic modulus decrease with the rise of MC; meanwhile, the tensile failure mode alters to the shear failure mode (Tang, 2018; Tang et al., 2021).…”