基于模糊综合评判法和有限元法的超声波测桩评定方法

在建立评价集的隶属函数的基础上,采用加权平均法对超声波测桩进行模糊综合评价;再用有限元法计算桩身不同位置在相同缺陷的情况下的桩基竖向承载力,计算出不同位置的缺陷影响系数;将模糊综合评价的结果与相应的缺陷影响系数相乘,并将所有的乘积结果值相加,得到一个考虑桩基缺陷位置的综合评定。与其他超声波测桩评定方法相比,该方法以桩基的竖向承载力为依据,并考虑了缺陷位置,是一个更全面、更准确的评定方法。

Evaluation of Pile Test by Ultrasonic Wave Based on Fuzzy Comprehensive Evaluation Method and Finite Element Method

On the basis of establishing membership function of evaluation set,weighted average method is applied to carry out fuzzy comprehensive evaluation on file test by ultrasonic wave.The vertical bearing capacity of pile foundation is calculated at different positions of pile body under the same defect condition,and the defect impact factors at different positions are also calculated.Firstly,the results of fuzzy comprehensive evaluation and corresponding defect impact factors are multiplied;then,all the obtained results are added to get a comprehensive evaluation when the certain defect position in pile foundation is considered.Compared with other evaluation methods of pile test by ultrasonic wave,the proposed method depends on the vertical bearing capacity of pile foundation and considers defect position,which is a more comprehensive and accurate evaluation method.