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| Dynamic Modeling of Underground Structure Based on Viscoelastic Boundaries under Construction Vibration |
| YU Hai-Tao-1, 2a , YUAN Yong-2, b , ZHU Yi-Min-3, WANG Jian-Hua-1 |
| (1. Department of Civil Engineering, Shanghai Jiaotong University, Shanghai 200030, China;2a. Department of Geotechnical Engineering, 2b. Key Laboratory of Geotechnical and Underground Engineering ofMinistry of Education, Tongji University, Shanghai 200092, China;3. Shanghai No.1 Construction Co. Ltd., Shanghai 200120, China) |
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Abstract A three-dimensional finite element model based on viscoelastic boundaries was developed to effectively capture the dynamic behavior of the metro transfer hall hub of the People’s Square. Dynamic characteristics of the underground structure during vibration induced by dismantling temporary reinforced-concrete supporting system were studied, resorting to the Newmark method. In-situ monitoring data were used to calibrate the proposed method in this paper. The results show dynamic characteristics of the underground structure under vibration loading are accurately simulated by the presented model based on viscoelastic boundaries, and thus spurious reflections on the interface of soil and structure can be effectively eliminated. Prediction on the possibility of structural resonance under vibration loading can also be made by the proposed model, which is of benefit to decision making of engineering design and construction.
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Received: 27 July 2011
Published: 30 January 2012
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