Research On Nondestructive Detection Technology Of Airport Road Disease Based On Vibration

Based on the characteristics of elastic wave propagation,the seismic image method was introduced and the two-dimensional finite element model of the underground structure of airport yard was established by using the finite element software ABAQUS.In addition,combined with field tests,the feasibility of P-wave and S-wave seismic imaging method for detecting and recognizing the void of pavement slab and the feasibility of surface wave seismic imaging method for detecting and recognizing the void of foundation are verified.The main research contents and results are as follows:1.When the S-wave and P-wave seismic imaging method is used to detect the cavity of the track panel,abnormal phenomena such as amplitude increase and vibration duration increase appear according to the continuous condition of the in-phase axis,which can effectively identify the existence of the cavity.2.The change of the material parameters at the base of the pavement structure within a certain range will not affect the void detection effect of the P-wave and S-wave seismic images;Selecting the proper source frequency is beneficial to improve the detection effect.3.When the surface wave seismic imaging method is used to detect the void of foundation,the foundation subsidence disease can be effectively identified according to the characteristics of in-phase axis lag and disorder.However,it can not directly reflect the size characteristics of the void area.4.When the depth of void is relatively shallow,the resolution of arc-shaped reflection characteristic signal decreases,the offset can be appropriately increased,interference signals can be effectively eliminated,the resolution of seismic image can be improved,and the existence of void disease can be better identified.