Introduction  With the increasing installed scale of onshore wind turbines in China, quality defects in WTGS foundation are very common, directly affects the safe operation of the equipment and equipment safety. The foundation of WTGS has the characteristics of large volume and complex structure, the applicability of conventional detection methods in the case of large size and dense reinforcements needs comparative analysis, studying the detection methods for WTGS defects has significant practical engineering significance.

  Method  This article took a wind turbine reinforcement project as the research object, using geological radar method, ultrasonic transverse wave method, drilling detection method, based on the detection principles of various detection methods and results, the applicability and detection accuracy of each detection method were analyzed. Resu lt The analysis results show that: the higher the emission frequency, the higher the defect location accuracy and the lower the effective detection depth of geological radar method; the ultrasonic transverse wave method is only applicable to shallow detection of concrete, detection accuracy is high ; the drilling detection method has excellent visibility, and the results are intuitive and accurate.

  Conclusion  For detection of foundation defects in WTGS , the geological radar method and ultrasonic transverse wave method are suitable for detecting shallow concrete defects, and using high-frequency spectrum detection can achieve good detection accuracy; the drilling detection method can be used for detecting shallow and deep defects in concrete foundations and the detection results is intuitive.