Prestressed anchor technology is the world around the tunnel, excavation, high slope and deep foundation pit engineering supporting a wide range of applications, its use by relatively intact wall rock, soft rock mass of underground structure, and coal, soil structure. Bolt anchoring quality and stress state of the detection are still stays in the destructive drawing test phase, the detection means both the costs and time consuming, the reinforcement of rock also produced strong perturbations, reduces the reinforcing effect of bolts on surrounding rock. Therefore, nondestructive testing technology for bolt anchoring quality evaluation with a new method.

In view of the engineering rock mass anchorage condition environment easy to change this phenomenon, the fluctuation theory, the anchorage state detection was studied theoretically, some main results are obtained as follows:

1 through the theory of stress wave analysis, studied the elastic wave propagation in the anchoring system, obtained the elastic wave in the anchoring system attenuation and energy distribution rule, for bolt anchoring quality testing provides important theoretical basis.

2 anchor system for nondestructive testing available concretion wave speed, anchorage length, working load of bolts and other parameters as judged by the quality of the basis, the results show that the consolidation wave speed and prestressed anchor rod and anchor agent on the bond strength of the. Anchoring the better quality, higher bond strength, concretion wave speed closer to the anchoring medium velocity; anchorage quality worse or no bonded anchor, the consolidation wave speed is close to or ten anchor rod body wave. While working load and ultimate bearing capacity from another angle reflects the anchorage quality.

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