| To study the dynamic behavior of rock support elements, a drop weight setup available at CANMET-MMSL was used. In this project, cone bolts were dynamically loaded with a mass of 1016 kg or 1416 kg released from 1.0 m or 1.5 m. The experimental setup is well equipped to monitor the displacements of both ends of the bolt and the applied force. First, a qualitative analysis revealed the two energy absorption mechanisms of the bolt; the steel elongation and the bolt sliding in the resin. Both mechanisms are present during every test, but their proportions vary significantly. Then, a quantitative analysis revealed certain intrinsic properties of the bolt and the influence of the testing parameters on its response. Also, the energy balance of the system proved that the principle of energy conservation is respected through the measurements and calculations. Finally, a two degrees-of-freedom model is proposed to simulate the test. The simulated displacements and force were found to be in good agreement with the corresponding experimental signals. |
