Research on Fracture Characteristics and Energy Dissipation of Hard Rock under the Excitation of Ultrasonic Vibration

To promote the application of ultrasonic vibration rock crushing technology in underground rock-drilling engineering, it is necessary to investigate damage and fracture characteristics hard under excitation vibration. In this study, brittle red sandstone was taken as research object, experiments were carried out, macrodeformation samples monitored by strain gauges. The experimental results show that curve can be divided into compaction stage, elastic deformation stage; with increase static load, maximum intrusion depth failure exponentially. study evolution energy dissipation mechanism vibration, a numerical model established using particle flow software PFC2D. proposed effectively simulate Through analysis displacement field, stress dynamic process samples, revealed. addition, simulation tests on out different loads, number cracks real time. loads accelerate initiation propagation improve utilization rate energy.