Multi-factor fuzzy comprehensive evaluation method for pile foundation quality detection

By combining fuzzy mathematics and an improved analytic hierarchy process (AHP) with entropy weighting, along with low-strain and ultrasonic testing methods, a dynamic equilibrium combined weighting model is constructed. This overcomes the limitations of single testing methods in pile foundation quality inspection, enabling accurate evaluation of pile integrity and reducing the misjudgment rate.

CN120849768APending Publication Date: 2025-10-28GUANGDONG UNIV OF TECH
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Patent Information

Application Number
CN202510916502.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-07-03
Publication Date
2025-10-28

AI Technical Summary

Technical Problem

Existing pile foundation quality testing methods rely on a single testing method and lack a scientific multi-source information fusion mechanism, resulting in deviations between the evaluation results and the actual integrity status of the pile body, a high misjudgment rate, and an inability to accurately reflect the quality status of the pile body.

Method used

By employing fuzzy mathematics theory and an improved analytic hierarchy process (AHP)-entropy weighting method, combined with the index parameters of low-strain testing and ultrasonic testing, a dynamic equilibrium combined weighting model is constructed. The fuzzy mathematical model is then used for comprehensive evaluation to quantify the integrity of the pile body.

Benefits of technology

It improved the accuracy of pile foundation defect identification, reduced the risk of misjudgment, and enhanced the objectivity and engineering adaptability of pile foundation quality evaluation. The identification accuracy rate increased from 52% to 87%.

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Abstract

The invention discloses a multi-factor fuzzy comprehensive evaluation method for pile foundation quality detection, and belongs to the field of pile foundation detection. According to the method, multi-dimensional information complementarity of a low strain method and an ultrasonic method is fused, pile body defect dynamic characteristics and depth effect influences are considered, and the method mainly comprises the steps that index parameters of the low strain method and the ultrasonic method are collected; constructing a four-level membership function and establishing a fuzzy membership matrix; determining an initial weight set based on an analytic hierarchy process, introducing an amplitude attenuation gradient item and a pile length segmentation weight correction entropy weight method, dynamically adjusting a subjective and objective weight fusion proportion in combination with a parameter variation coefficient, and calculating a final weight set; and a result is quantized through fuzzy operation, and a comprehensive evaluation value is output in combination with the pile type weight. The method overcomes the defects that a traditional static weighting method is insufficient in adaptability to dynamic fluctuation of detection parameters and does not incorporate physical characteristics and depth effects of pile body defects, the objectivity and engineering adaptability of pile body integrity evaluation are remarkably improved, and the method is suitable for end bearing piles and friction piles.
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