Abstract：Concrete carbonization may occur on the inner surface of metro shield tunnel change the mechanical performance of longitudinal joint in long service. Considering details of joint surface, different non-linear mechanical property of general and carbonated concrete, the contact characteristics of joint surface and pre-tightened bolt, the bending mechanical model of longitudinal joint are established, by which the crush of concrete, the yield of bolt and the limit state of longitudinal joint are characterized. Then the flexural behavior of longitudinal joint in metro shield tunnel with carbonization is analyzed using full-scale bending test of longitudinal joint to verify the engineering design suitability. The results show that it is applicable to study the influence of carbonization when the constitutive calculation of longitudinal joint is carried out in full integral form. Meanwhile, concrete carbonization under sagging moment has no significant effect before the concrete contact of inner surface edges. After concrete contact, with the increase of carbonization thickness, the maximum values of bolt strain, seam opening and compression grow while ultimate bending moment all increase, but the growing rate decreases. In addition, the axial force produces no obvious coupling effect on mechanical properties of longitudinal joint after carbonization.
郑勇波 白廷辉 李晓军. 考虑碳化的地铁盾构隧道纵缝接头抗弯力学模型研究[J]. 土木工程学报, 2021, 54(12): 94-103.
Zheng Yongbo Bai Tinghui Li Xiaojun. Study on bending mechanical model of longitudinal joint in metro shield tunnel considering concrete carbonization. 土木工程学报, 2021, 54(12): 94-103.
