弹性地基接缝板声振法脱空判定

采用声振法研究接缝和弹性地基脱空与声学特征变化的关系，利用有限元方法分析了有、无脱空接缝板的振动频率。通过声振法检测，得出地基脱空的范围及大小与声学特征参数具有很好的相关性，以某一脱空路面为例，通过计算分析，提出采用基于信息融合理论的集成神经网络技术对刚性路面脱空状况进行识别。为用声学特征进行地基脱空等缺陷无损检测提供了理论和实验依据。该法速度快、精度高，便于实际应用。

Void identification of jointed slab on elastic foundation by acoustic vibration

Relationship between jointed slab and void of elastic foundation and acoustic features of resonator is studied by acoustic vibration.The vibration frequencies of jointed slab with or without void are calculated and analyzed by finite element method(FEM).The range and size of void,detected by acoustic vibration,prove to be closely associated with the acoustics features.Taking a void pavement slab as the example,by calculating and analyzing,an integrated neural network based on information fusion can be applied to identify the void of rigid pavement slab.Thus it offers theoretical and experiment basis for NDT of the defect like foundation void by means of acoustic features.The method proves to work rapidly,precisely and conveniently in practical application.