The Analysis of Compression–Shear Infiltration Characteristics of Joint Rock Under Different Load Conditions

To obtain the compression–shear infiltration characteristics of joint rock, the coupled compression–shear infiltration tests of samples were carried out under different loading and boundary conditions. The shear dilatation, permeability and the change laws of hydraulic opening of jointed rockmass were obtained under different normal stiffness and loading conditions. It is shown that the contact area gradually becomes smaller and smaller with the relative sliding of two jointed surfaces. And the contact ratio is down to a minimum value when the main processes of the jointed surface reach the peak shear strength. The remaining main processes is gradually destroyed, the contact ratio of joint surface becomes larger after the main processes reaches the peak strength. The contact ratio tends to be stable until all processes were all destroyed. Due to the influence of the joint surface protrusion, the normal displacement is smaller and then increases with the increase of shear displacement. The less the stiffness of jointed rock mass is, the greater the over water area of the joint surface is, the greater the permeability is, the greater the final stability value of the hydraulic opening degree is. The theoretical basis is provided for the fractured rock mass formed of permeable channels, initiation and outbreak of permeability disaster evolution process. © 2018, Springer International Publishing AG, part of Springer Nature.