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Fully fluid-solid coupling dynamic model for seismic response of underground structures in saturated soils |
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| Authors: | Liang Li Hongyun Jiao Xiuli Du Peixin Shi |
| Institution: | 1.College of Architecture and Civil Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing, 100124, China ;2.School of Urban Rail Transportation, Soochow University, Suzhou, 215002, China ; |
| Abstract: | The seismic response characteristics of underground structures in saturated soils are investigated. A fully fluid-solid coupling dynamic model is developed and implemented into ABAQUS with a user-defined element to simulate the dynamic behavior of saturated soils. The accuracy of the model is validated using a classic example in literature. The performance of the model is verified by its application on simulating the seismic response characteristics of a subway station built in saturated soils. The merits of the model are demonstrated by comparing the difference of the seismic response of an underground structure in saturated soils between using the fully coupling model and a single-phase medium model. The study finds that the fully coupling model developed herein can simulate the dynamic response characteristics of the underground structures in saturated soils with high accuracy. The seismic response of the underground structure tends to be underestimated by using the single-phase medium model compared with using the fully coupling model, which provides a weaker confining action to the underground structure. |
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