Static and dynamic tensile behavior of rock-concrete bi-material disc with different interface inclinations

To investigate the effect of interface inclination on the tensile behavior of rock-concrete bi-material, quasi-static and dynamic splitting tests were conducted on rock-concrete discs. The angle between rock-concrete interface and loading direction ranges from 0 degrees to 90 degrees. The fracture development processes of rock-concrete bi-material disc specimens were monitored by a high-speed camera. Test results show that specimens under static and dynamic loading fail via three typical modes: interface fracture, tensile fracture, the mixture of tensile and interface fracture. The failure mode of specimen changes from interface fracture to tensile fracture as the interface inclination increases from 0 degrees to 90 degrees. The nominal tensile strength increases gradually with the increase of the interface inclination under both static or dynamic loading conditions. In dynamic tests, the dissipated energy increases gradually from 0 degrees to 60 degrees along with the increase in interface inclination. However, when the interface inclination exceeds 75 degrees, the dissipated energy decreases to that at 45 degrees. When the interface inclination further increases to 90 degrees, the dissipated energy increases. (C) 2020 Elsevier Ltd. All rights reserved.