Analysis of bearing characteristics of cantilever anti-slip pile based on cohesion model in acid rain corrosion environment.

Abstract

To investigate the response of cantilever anti-slip pile structures throughout the entire process of cracking and failure under acid rain corrosion, as well as the degradation mechanisms that affect their bearing capacity, a numerical simulation method based on cohesive elements is proposed. By integrating this method with laboratory tests, a finite element numerical calculation model incorporating cohesive elements is established. The reliability of the cohesive force model is validated through comparisons of the load-displacement curves, bending moments, and crack distribution patterns. Building on this foundation, a numerical calculation model for cantilever anti-slip piles subjected to acid rain corrosion, considering various corrosion rates, is developed. This model is employed to analyze the bearing characteristics of anti-slip piles under different corrosion conditions. Additionally, stiffness and bearing capacity calculation formulas for corroded reinforced anti-slip piles are proposed and verified using existing experimental data.The results indicate that, compared to the embedded model, the cohesive model exhibits load-displacement curves and crack distribution patterns that more closely align with experimental data, demonstrating a higher degree of correlation. As the corrosion rate increases, the peak stress at the bond interface of reinforced concrete decreases, the maximum displacement increases, and the strain ratio between reinforcement and concrete rises, ultimately leading to a reduction in bearing capacity. Among the factors influencing the bearing performance of acid rain-resistant piles, the strength of the reinforcement is the most significant, followed by bond strength, with the strength of concrete being the least influential. When the corrosion rate is low, the calculated values for the stiffness and bearing capacity of corroded reinforced anti-slip piles are in good agreement with experimental values.These research findings provide a valuable scientific basis and practical significance for evaluating the bearing characteristics of cantilever anti-slip piles in environments affected by acid rain corrosion.