Jia Yanping, Ren Qingyang, Xiao Songqiang, Gao Senlin, Xie Wenhao
School of Civil Engineering, Chongqing Jiaotong University, Chongqing, 400074, China.
State Key Laboratory of Mountain Bridge and Tunnel Engineering, Chongqing Jiaotong University, Chongqing, 400074, China.
Sci Rep. 2025 Jul 2;15(1):23371. doi: 10.1038/s41598-025-06925-7.
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.
为研究悬臂式抗滑桩结构在酸雨腐蚀作用下从开裂到破坏全过程的响应，以及影响其承载能力的劣化机制，提出了一种基于粘结单元的数值模拟方法。通过将该方法与室内试验相结合，建立了包含粘结单元的有限元数值计算模型。通过对比荷载 - 位移曲线、弯矩和裂缝分布形态，验证了粘结力模型的可靠性。在此基础上，建立了考虑不同腐蚀速率的酸雨腐蚀作用下悬臂式抗滑桩的数值计算模型，用于分析不同腐蚀条件下抗滑桩的承载特性。此外，提出了锈蚀钢筋抗滑桩的刚度和承载力计算公式，并利用已有试验数据进行了验证。结果表明，与埋入式模型相比，粘结模型的荷载 - 位移曲线和裂缝分布形态与试验数据更为吻合，相关性更高。随着腐蚀速率的增加，钢筋混凝土粘结界面处的峰值应力降低，最大位移增大，钢筋与混凝土的应变比增大，最终导致承载能力降低。在影响酸雨抗性桩承载性能的因素中，钢筋强度影响最为显著，其次是粘结强度，混凝土强度影响最小。当腐蚀速率较低时，锈蚀钢筋抗滑桩的刚度和承载力计算值与试验值吻合较好。这些研究结果为评估酸雨腐蚀环境下悬臂式抗滑桩的承载特性提供了有价值的科学依据和实际意义。
