Influence of interface morphology on dynamic behavior and energy dissipation of bi-material discs
(School of Resources and Safety Engineering, Central South University, Changsha 410083, China)
Abstract: To investigate the dynamic behavior and energy dissipation of the rock-concrete interface, dynamic splitting tests on bi-material discs were conducted by using the split Hopkinson pressure bar. The test results reveal that with the change of the interface inclination angles (q), the influence of interface groove width on the bearing capacity of specimens also varies. When q increases from 0° to 30°, the bearing capacity of the specimen increases first and then decreases with the rise of the interface groove width; the optimal groove width on the rock surface in this range of interface inclination angles is 5 mm. When q increases from 45° to 90°, the bearing capacity of the specimen has no obvious change. Moreover, when q increases from 0° to 45°, the dissipated energy of the specimens rises obviously at first and then tends to be stable as the width of the interface groove increases.
Key words: rock-concrete interface; Brazilian disc splitting; fracture development; interface mechanical properties; dynamic behavior; energy dissipation