Variable fuzzy set model for evaluation of intergrity of pile foundation based on SPA

Based on the set pair analysis (SPA) and the variable fuzzy sets theory, In order to simplify the evaluation procedure of relative difference degree and make the accurate evaluation of the the integrity of pile foundation quantitatively, a new variable fuzzy set model for evaluation of integrity of pile foundation was established. Moreover, it was shown by comparison of results between a practical example and other methods that the proposed method used to evaluate the integrity of pile foundation was feasible and more accurate.