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本文讨论了反射波波形与基桩缺陷的关系，并通过实例分析了缩径桩与扩径桩，缩径桩与离桥桩和胶结不良桩的区别.
This paper discusses the relationship between the reflected wave shape and the defects of foundation piles, and analyzes the differences between the reduced-diameter piles and the enlarged-diameter piles, the reduced-diameter piles, the off-bridge piles and the bad cemented piles.