钢筋锈蚀劣化对隧道衬砌结构性能的影响

发布时间：2018-06-18 11:35

本文选题：隧道工程 + 钢筋混凝土衬砌　；参考：《中国公路学报》2014年08期

【摘要】：为了研究钢筋锈蚀劣化对隧道衬砌耐久性的影响,通过大量不同锈蚀程度钢筋混凝土试件单轴拉拔以及压弯试验,获得了不同锈蚀率下,钢筋混凝土试件的粘结强度、开裂荷载的退化规律。通过ANSYS有限元数值模拟,建立粘结力退化模型,并基于试验所获粘结力退化曲线,模拟隧道钢筋混凝土衬砌在不同腐蚀程度下结构承载力的变化,进一步研究了不同程度锈蚀量对衬砌结构内部钢筋与混凝土相对滑移量的影响。研究结果表明:混凝土保护层厚度对衬砌结构强度损失有显著影响;钢筋锈蚀率与结构残余强度呈线性相关关系;重度锈蚀条件下衬砌结构最危险的受力截面为衬砌墙角处;钢筋腐蚀与开裂荷载并非简单的线性关系。研究结论可用于评估隧道混凝土衬砌结构腐蚀程度,并为新建隧道混凝土衬砌结构的耐久性设计提供参考。
[Abstract]:In order to study the effect of corrosion and deterioration of steel bar on the durability of tunnel lining, through a large number of uniaxial drawing and bending tests of reinforced concrete specimens with different corrosion degrees, the bond strength and the degradation law of the cracking load are obtained under different corrosion rates. The degradation model of bond force is established through the numerical simulation of ANSYS finite element method. On the basis of the bond strength degradation curve obtained by the test, the change of the structural bearing capacity of the tunnel reinforced concrete lining under different corrosion degrees is simulated. The effect of the corrosion on the relative slip of the reinforced concrete and concrete inside the lining structure is further studied. The results show that the thickness of the concrete protective layer is lost to the strength of the lining structure. The corrosion rate of steel bar has a linear relationship with the residual strength of the structure; the most dangerous section of lining structure under the severe corrosion condition is the lining of the lining wall; the corrosion and cracking load of the steel bar are not simple linear relation. The research conclusion can be used to evaluate the corrosion degree of the tunnel concrete lining structure, and it is a new tunnel concrete. The durability design of lining structure provides reference.
【作者单位】：西南交通大学交通隧道工程教育部重点实验室;中国石油天然气股份有限公司;
【基金】：国家自然科学基金项目(51278427) 高速铁路基础研究联合基金项目(U1134208) 中国石油天然气股份有限公司科技开发项目(XVQ-V-52(50)-2013)
【分类号】：U451.4

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