利用应力波曲线拟合识别桩身缺陷的一种反演方法

通过建立桩 -土系统的力学模型 ,给出了考虑桩土相互作用的应力波动方程的特征线解法 ,继而应用优化方法对桩身缺陷进行定量识别 ,在识别中利用完整桩的土参数反演以及对缺陷桩进行等效波阻抗反演和缺陷认定。数值模拟和工程桩实例表明 ,本方法对缺陷桩不仅能够较好地识别出来 ,而且对一次缺陷或二次缺陷的判断具有较高的反演精度。

AN INVERSE METHOD OF PILE FAULTS' IDENTIFICATION VIA FITTING STRESS WAVE CURVES

A mathematic model for pile-soil system is established. The method of characteristic lines to solve the stress wave equations is proposed considering the interactions of pile and soil.The optimization method can be used to quantitatively detect the faults in piles, where the soil parameters inversed from a model with complete pile are used to inverse the equivalent stress wave impedance for others with damaged piles and then identify their corresponding faults. Numerical examples of the simulation for experimental piles and of the detection for engineering piles show that the method gives the quite accurate results, especially for those with primary or secondary faults.