Abstract:The low strain longitudinal dynamic model of anchor bars-surrounding rock system under impulse force is established. The model is essential to nondestructive detection of anchorage system quality. Through theoretical study,model experiment and numerical simulation,the characteristics of dynamic response with different defects in the anchor bars are studied. In dynamic analysis,the variations of dynamic parameters reflect the damaged degree of anchorage system and dynamic parameters are the vital reference of the anchorage quality. The simplified models of anchorage system with different damage conditions are constructed in laboratory;and a new approach which uses genetic algorithm is employed to solve the problem of multi-parameter inversion for anchorage system in dynamic testing. By modern signal processing and artificial intelligent methods,the method of fixing defect position and structure identification of anchorage system are researched. Meanwhile,a quantitative assessment method of anchoring quality is put forward;and an intelligent diagnosis system for nondestructive evaluation of anchorage system is established and applied to field engineering.