Joint conductivity variation due to normal and shear deformation

Coupled shear conductivity tests have been performed on natural joints in magmatic, metamorphic and sedimentary rocks. Conductivity, normal and shear displacements and stresses were recorded. Whether joint conductivity increases or decreases with ongoing shear, depends on the joint/rock properties and the stresses applied. The uniaxial compressive strength, joint compressive strength, joint roughness coefficient, normal stress acting across the joint and shear displacement are anticipated to be the major parameters and a first attempt of quantification is undertaken