ABSTRACT
Several domestic and foreign scholars have conducted studies on complete bolts and defective bolts. It is concluded that the mechanical properties and working principle of a defective anchor are slightly different from the intact rock bolt, and the stress development process and the stress wave propagation process are different from those of the intact rock bolt too. In order to study the dynamic response of the whole bolt and the defective anchor, and discuss the effect of the load on the dynamic test signal of the single empty slurry, an experiment for the step loading of a single air plasma defective anchor bolt was conducted. The non-destructive test was conducted on the single empty slurry defective anchor rod under different loads to obtain its dynamic test signals. Through the analysis of the dynamic test signals at all levels of load, the distribution and development of stress in the anchor bolts are obtained, which can provide some reference values for the evaluation of the quality of the anchor bolts.
