Citation: | LAN Riyan, YANG Kai, QIU Yunhui, CUI Yaozhong, QIAO Minjie, YAN Qixiang. Deterioration Characteristics of Tunnel Support Structures under Surrounding Rock Creep[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230442 |
To investigate the long-term deterioration characteristics of tunnel support structures under creep effect, mechanical models of anchor bolt fracture, steel arch frame yielding, and concrete plastic damage were established for the tunnel support structure system. Numerical examples were used to verify the validity of the mechanical models for support structure deterioration. The deterioration characteristics of anchor bolt fracture, steel arch frame yielding, and lining damage were explored under conditions dominated by vertical stress, hydrostatic pressure, and horizontal stress. The results show that the fracture first occurs at the anchor bolt at mid-height of the tunnel sidewall and then develops circumferentially towards both sides. The axial force of the steel arch frame first increases rapidly, then develops slowly, and finally decreases significantly. The rapid decrease of axial force is accompanied by drastic changes in the bending moment, with some measuring points appearing a change of bending moment from negative to positive. The compressive damage zones are mainly distributed at the sidewall and wall foot positions of the tunnel, while tensile damage first appears on the surface of the secondary lining at the mid-height of the sidewall. As the lateral pressure coefficient increases, the anchor bolt fracture, the steel arch frame yielding, formation of a continuous compressive damage zone in the lining, and the maximum tensile damage appear earlier.
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