锈蚀情况下隧道衬砌承载性能变化

doi:10.6040/j.issn.1672-3961.0.2025.026

摘要/Abstract

摘要： 针对钢筋锈蚀对混凝土衬砌承载性能的影响规律,通过拉拔试验研究锈蚀率对钢筋混凝土黏结性能的影响,并以此为基础利用数值仿真研究锈蚀钢筋与混凝土黏结-滑移仿真,同时利用隧道承载模型研究钢筋锈蚀作用下隧道承载衰减规律。结果表明,将C40混凝土和HRB400钢筋组合的钢筋临界锈蚀率范围从1%~3%进一步缩小到1%~2%;基于ABAQUS的等尺寸拉拔模型可准确预测锈蚀情况下的黏结-滑移行为,并通过隧道承载模型发现,当右侧拱脚位置发生锈蚀后,隧道衬砌左侧表面应力基本不变,右侧拱肩和右侧拱腰位置应力随锈蚀率增加先减后增,右拱脚位置表面应力先增后减;通过隧道承载模型发现,当右侧拱脚位置钢筋产生大于1%锈蚀后,隧道承载性能劣化,并预测当此处钢筋产生15%锈蚀后,隧道左右拱脚、右拱腰处安全系数低于规范要求的2.0,失去安全承载力。

关键词: 钢筋锈蚀, 黏结-滑移, 隧道衬砌, 结构分析, 数值仿真

Abstract: This study investigated the influence of steel reinforcement corrosion on the load-bearing performance of concrete linings. Pull-out tests were conducted to examine the effect of corrosion rate on the bond behavior between steel reinforcement and concrete. Based on the experimental results, numerical simulations were performed to model the bond-slip behavior between corroded steel bars and concrete. Concurrently, a tunnel load-bearing model was employed to analyze the degradation pattern of tunnel bearing capacity under reinforcement corrosion. The results indicated that the critical corrosion rate range for the combination of C40 concrete and HRB400 steel bars was further narrowed from 1%-3% to 1%-2%. An isometric pull-out model based on ABAQUS accurately predicted the bond-slip behavior under corrosion conditions. Furthermore, the tunnel load-bearing model revealed that when corrosion occurred at the right arch springing position, the surface stress on the left side of the tunnel lining remained essentially unchanged, whereas the stresses at the right arch shoulder and right arch haunch first decreased and then increased with increasing corrosion rate. The surface stress at the right arch springing initially increased and then decreased. The tunnel load-bearing model also demonstrated that reinforcement corrosion exceeding 1% at the right arch springing deteriorated the tunnel's bearing capacity. It was predicted that when the corrosion rate of the reinforcement at this location reached 15%, the safety factors at the left and right arch springings and the right arch haunch would fall below the required value of 2.0 as specified in the relevant code, indicating a loss of safe load-bearing capacity.

Key words: rebar corrosion, bond slip, tunnel lining, structural analysis, numerical simulation

中图分类号:

TU37

刘健,李霄汉,邓道军,寇磊,张瀚鸣,解全一. 锈蚀情况下隧道衬砌承载性能变化[J]. 山东大学学报 (工学版), 2026, 56(4): 125-134.

Liu Jian, Li Xiaohan, Deng Daojun, Kou Lei, Zhang Hanming, Xie Quanyi. The change of bearing performance of tunnel lining under corrosion condition[J]. Journal of Shandong University(Engineering Science), 2026, 56(4): 125-134.

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