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| Damage behavior of tunnel-type anchorages of railway suspension bridges under loading |
| JIANG Nan1，2，FENG Jun1，2 |
(1. College of Civil Engineering，Southwest Jiaotong University，Chengdu，Sichuan 610031，China；2. Key Laboratory of
High-speed Railway Engineering，Ministry of Education，Southwest Jiaotong University，Chengdu，Sichuan 610031，China) |
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Abstract The tunnel-type anchorage is the primary anchorage type for suspension bridges. The anchor plug and the surrounding rock form a complex force system. The bearing mechanism and the complete mechanical damage behaviors of tunnel-type anchorages are still not very clear. An elastic-brittle plastic damage constitutive model for rocks is developed in finite element software ABAQUS. The damage model considering both the tensile and shear failure mechanisms can better simulate the rock deformation and failure process，and expand the application areas of the original model embedded in ABAQUS. The numerical analyses are conducted to reveal the mechanical damage behaviors of tunnel-type anchorages buried at different depths. The results show that the deforming of tunnel anchorages exhibits a significant progressive failure behavior. The change of failure modes influenced by buried depth is related to the confining pressure，and the increasing of confining stresses improves the ductility or plasticity of rocks. For the shallow buried tunnel-type anchorages with low confining stresses，the mechanical system is a little bit of brittle，so a horn-shaped failure surface and a composite mechanical mechanism of tensile and shear failure are found. For the deep buried cases with high confining stresses，the mechanical system has high ductility，the shear failure occurs at the interface between the anchor plug and surrounding rocks，and the limit bearing capacity has an evident increasing compared with the shallow buried cases. The investigated horn-shaped failure surfaces in this study are very different from the failure surfaces traditionally used in practical engineering，which may affect directly the establishment of calculation model of bearing capacity. Hence，the extra attentions should be paid to the actual failure form in the design of tunnel anchorages.
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2018, Vol. 37 
