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本文提出了一种诊断桩结构故障的振动系统识别方法。在理论分析方面,建立了一个“桩-土”系统的连续型动力学模型,并导出了其解析解,提供了用系统识别法诊断桩故障的理论依据;在试验分析方面,采用模态分析理论,通过实测传递函数。识别出“桩-土”系统的诊断参数,用于桩结构完整性检验及单柱承载能力评价。最后给出了几个应用实例,其诊断结论与实际开挖结果相当一致。
This paper presents a vibration system identification method for diagnosing faults in piles. In terms of theoretical analysis, a continuous dynamic model of “pile-soil” system was established, and its analytical solution was derived, which provided a theoretical basis for diagnosing pile faults using the system identification method; in the aspect of experimental analysis, modal analysis was used. Theory, through the measured transfer function. The diagnostic parameters of the “pile-soil” system were identified for the integrity testing of the pile structure and the evaluation of the bearing capacity of the single column. Finally, several application examples are given. The diagnosis conclusion is quite consistent with the actual excavation results.