Design and experiment of hydraulic impact loading system for mine cable bolt

摘要

Mine pre-stressed cable bolt under impact of large loads may be broken or pulled out, and during this loading process, violent friction taken place between steel strand and anchorage will produce high-temperature and friction sparks. No existing test bed can conduct impact loading experiment. In order to test the process, we designed a hydraulic impact loading system for mine cable bolt for the first time. The system can simulate the work conditions of cable bolt being pulled off or break under different impact loads in the environment filled with thick mash gas. The system can also be used to research the failure mechanism of cable bolt support and to test the possibility of gas burn or explosion ignited by the sparks or high temperature. With AMESim software, we established a simulation model of the impact loading system and performed a performance simulation. Simulation results show that the designed experimental system can achieve a high-speed and a heavy impact load. So its dynamic performances can meet the requirements of cable bolt impact test. The experiment also shows that the experimental conditions are similar to that of the cable bolt being pulled out in reality.