Variable-speed grouting defect nondestructive testing method, device and equipment and storage medium

Abstract

The invention discloses a variable-speed grouting defect nondestructive testing method, device and equipment and a storage medium, and relates to the technical field of nondestructive testing, and the method comprises the following steps: obtaining a target detection area, a common midpoint gather and a defect weighting function; detecting a target grouting defect based on the target detection area and the common midpoint gather, and determining ultrasonic propagation time; defect imaging energy is detected based on the target detection area, the defect weighting function and the ultrasonic propagation time, an imaging comparison result is determined, and variable-speed grouting defect nondestructive detection is completed based on the imaging comparison result. According to the method, the root-mean-square velocities of different layers are obtained through velocity analysis and dynamic correction calibration, and then the layer velocities are converted and calculated, so that the propagation time of ultrasonic waves in the multilayer structure is accurately calculated, accurate positioning of defects is realized, variable-velocity synthetic aperture focusing imaging is performed, and the imaging precision is improved. And the accuracy and the efficiency of shield segment wall back grouting defect detection are obviously improved.

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