Mesoscopic Weakening Feature of Marble During Water Rock Interaction

Research on the water–rock interaction has become an important subject in rock mechanics field, the link between the mineral particles is weakened and the microstructure of rock mass is changed because of chemical corrosion effect after water–rock interaction. In this paper, double torsion testing of marble specimens has been adopt to determine subcritical crack propagation parameters during rock interaction, the morphological characteristics in this process were also quantified while the surface was scanned by a three-dimensional high-accuracy non-contact laser morphology instrument Talysurf CLI 2000. It shows the discreteness and deviation degree of datum plane on the surface of the rock specimens are increased after water–rock interaction, the highness difference decreased and become more coordinated. Meanwhile, the corresponding relationship between stress intensity factor K_I and subcritical crack growth velocity v shows that rock interaction speeds up the subcritical crack growth. Those testing results provide a basis for the micro damage mechanism studying for rock engineering stability which are related to hydrochemistry.