Fuzzy comprehensive evaluation on the integrity of the large bridge super-long bored piles

In the construction of large bridge engineering, ultra-long piles are often used in a kind of deep foundations. Due to the complex characteristics of pile foundation, site conditions, construction methods and processes have the particularity, the super long pile, inevitably has broken pile, necking, segregation and other defects, so the integrity of the pile need to be evaluated. This paper combined pile integrity testing with fuzzy comprehensive evaluation, and put forward a set of the pile body integrity fuzzy comprehensive evaluation method which is latest and has reason-able basis. Through the case study and verification of a large number of long piles, and comparing the evaluation results obtained by fuzzy comprehensive evaluation method with those obtained by the current evaluation method, the current evaluation method was found that it really has some deficiencies. However, the fuzzy compre-hensive evaluation method presented in this paper solved these deficiencies, and achieved good results.