Deformation process of argillite samples with joints under three-stage direct shear

• Main Authors: Usol’tseva, O. M., Tsoi, P. A., Semenov, V. N.
• Format: Conference Proceeding
• Language: English
• Subjects: Boundary conditions; Compressive properties; Deformation analysis; Hydraulic presses; Internal friction; Shear deformation; Surface roughness
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/1.5132243

The purpose of this laboratory study was to determine the regularities of deformation process of rock samples with joints under three-stage direct shear loading. The tests were carried out under the boundary condition “constant normal load” (CNL) at three values of normal compressive stress: 0.3, 0.6 and 0.9 MPa. Special test bench was developed and created on the base of servo-hydraulic press Instron 8802 for shear loading of rock samples according to ASTM D 5607 standard. The research demonstrated that the character of the deformation process of rock joints is essentially determined by the value of surface roughness coefficient under direct shear loading. The features of shear deformation are analyzed for three group of samples with different values of the roughness coefficient. The value of cohesion increases as the roughness coefficient increases. The angle of internal friction increases with increasing roughness value, however, these changes are minor.