Based on reflected wave features and a great number of detecting experiences, a correct judgement for abnormal curve of heavy defects on pile body is made so that the quality for building construction can be well controlled.

• 依据反射波的特征及大量检测经验对桩身严重缺陷 (断裂、夹泥、严重缩径、桩头松动等 )的异常曲线进行准确判断 ,为建筑工程把好质量关