ABSTRACT:

Sonoprobe method has been applied in non-destructive inspection of anchorage project. The fundament is that dynamic transient excitation causes the elastic vibration of an anchor bar, and flaws can be estimated or deduced by determining transient response of the anchor bar. FEA numerical solution of hyperbolic equation indicates that deductions must comply with acoustic parameters such as velocity of sound, vibration range, wave shape etc. when inspecting interior flaws in the grout of an anchor bar. Based on wavelet packet analysis, the energy eigenvector is a flaw vector, which could be regarded as the basis in the non-destructive inspection of anchors. As a non-linear dynamical system, artificial neural networks dealing with quality inspection of grey system have been proved efficient.

1 INTRODUCTION

Anchor rope is a component under great ground pressure. The failure in predicting stability of the anchorage system will bring projects inestimable loss, so it is necessary to check if the anchor bars play the roles according previous design. The low strain dynamic detection has been applied in quality test of anchor bar. On the mechanics field this method means that information of disturbance resource, boundary conditions and initial conditions have been given, and the dominant equation describing medium motion has been established. Thereby the dynamic response could be solved. In fact it is dealing with the variable field question that is come down to the question of initial value or initial-boundary value of hyperbolic type or hyperbolic-diffusibility type.

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