为探究多因素对受硫酸盐侵蚀隧道安全性的影响特征,基于经典损伤力学理论,将隧道衬砌的实际腐蚀状态看作无腐蚀状态和完全腐蚀状态的组合,建立数值模型探究各种因素对受硫酸盐侵蚀隧道安全性的影响规律,并分析其敏感性。结果表明:(1)隧道衬砌受硫酸盐侵蚀时,同等条件下拱脚腐蚀更加危险;(2)提升隧道衬砌初始强度和厚度可以提高隧道在未腐蚀时的安全性,但对提升受硫酸盐侵蚀后的安全性则十分有限;(3)隧道衬砌某部位腐蚀后,主要影响的是腐蚀部位的安全性,而对其他部位的安全性影响很小;(4)各因素对受硫酸盐侵蚀隧道安全性影响的敏感性大小依次为竖向荷载＞衬砌初始厚度＞衬砌初始强度＞腐蚀位置＞侧向应力系数＞弹性抗力。
To investigate the multi-factor influence characteristics on the safety of tunnels subjected to sulfate attack, based on classical damage mechanics theory, the actual corrosion state of tunnel lining is considered as a combination of the uncorroded and fully corroded states. A numerical model is established to explore the effects of various factors on the safety of tunnels under sulfate attack and analyze their sensitivity. The results show that: (1) When tunnel lining is eroded by sulfates, the corrosion at the arch foot is more hazardous under the same conditions. (2) Increasing the initial strength and thickness of tunnel lining can improve the safety of tunnels before corrosion but have limited effects on improving safety after sulfate attack. (3) After corrosion occurs at a specific part of the tunnel lining, it mainly affects the safety of that corroded part while having minimal impact on the safety of other parts. (4) The sensitivity of various factors affecting the safety of tunnels under sulfate attack is in the following order: vertical load > initial lining thickness > initial lining strength > corrosion location > lateral stress coefficient > elastic resistance.
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