Numerical Simulation of Multi-physics Field by Ultrasonic Transmission Method for Pile Foundations Containing Cavity Defects
With the rapid development of China′s construction industry,the use of pile foundations has become more and more widespread,and the integrity testing of pile foundations is crucial.Ultrasonic nondestructive testing technology has the advantages of large detection depth,wide range,high sensitivity and high speed,and has become the most used detection method in pile foundation inspection.Ultrasound in the concrete attenuation is serious,and in the concrete this collection of composite materials propagation process is very complex,the judgment of defects can only be qualitative analysis,not be quantitative analysis,can not accurately detect the specific location of defects.In order to accurately and effectively detect the location of pile foundation defects,a two-dimensional pile foundation nondestructive testing model is established by Comsol Multiphysics finite element analysis software,and the multi-physics field coupling is performed by using pressure acoustics,solid mechanics module and piezoelectric effect to analyze the propagation law of ultrasonic waves in single-hole cavities and double-hole cavities in different locations.The simulation results show that:no matter single-hole or double-hole cavity,ultrasonic waves form a gap behind the cavity and are in a straight line with the transmitting transducer and the cavity circle center;the specific location of the defect can be effectively judged by analyzing the first-wave sound pressure values at different locations in the transverse and longitudinal directions.
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