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Title |
A Study on Seismic Performance Evaluation of Tunnel to Considering Material Nonlinearity
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Authors |
최병일(Byoungil Choi) ; 하명호(Myungho Ha) ; 노은철(Euncheol Noh) ; 박시현(Sihyun Park) ; 강기천(Gichun Kang) |
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DOI |
https://doi.org/10.11112/jksmi.2022.26.3.92 |
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Keywords |
Mohr-Coulomb 모델; HS Small strain Stiffness 모델; 내진성능평가; 특성계수; 재료 비선형 Mohr-coulomb model; HS small strain stiffness model; Seismic performance evaluation; Parameter; Material nonlinearity |
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Abstract |
Various numerical analysis models can be used to evaluate the behavior characteristics of tunnel facilities which are representative underground structures. In general, the Mohr-Coulomb model, which is most often used for numerical analysis, is an elastic-perfect plastic behavior model. And the deformation characteristics are the same during the load increase-load reduction phase. So there is a problem that the displacement may appear different from the field situation in the case of excavation analysis. In contrast, the HS-small strain stability model has a wide range of applications for each ground. And it is known that soil deformation characteristics can be analyzed according to field conditions by enabling input of initial elastic modulus and nonlinear curve parameter and so on. However, civil engineers are having difficulty using nonlinear models that can apply material nonlinear properties due to difficulties in estimating ground property coefficients. In this study, the necessity of rational model selection was reviewed by comparing the results of seismic performance evaluation using the Mohr-Coulomb model, which civil engineers generally apply for numerical analysis of tunnels, and the HS Small strain Stiffness model, which can consider ground nonlinearity.
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