基于一维波动方程的桩基完整性检测方法

Detection Method of Pile Foundation Integrity Based on One⁃dimensional Wave Equation

通过以一维应力波理论为基础的低应变反射波法分析出病害处的波形传播规律及特征,并运用有限元数值方法对混凝土桩基某处出现不连续、离析、空洞等缺陷进行分析,得到频域和时域导纳曲线。将低应变反射波法得到的结果与有限元数值模拟结果进行对比分析,结合现场钻芯法验证,可确定桩身缺陷程度及类型,为提高桩基质量检测的精确性和可靠性提供参考依据。

Based on the one-dimensional stress wave theory,the low strain reflected wave method was used to analyze the wave propagation law and characteristics of the disease.The finite element numerical method was used to analyze the discontinuity,segregation,cavity and other defects in the concrete pile foundation,and the admittance curves in frequency domain and time domain were obtained.By comparing the results obtained by the low-strain reflected wave method with the finite element numerical simulation results,combined with the verification of the on-site core drilling method,the degree and type of pile defects can be determined,which can provide reference for improving the accuracy and reliability of pile foundation quality inspection.