Numerical and analytical investigation of compressional wave propagation in saturated soils |
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| Institution: | 1. School of Civil Engineering, Shandong University, Jinan 250061, China;2. School of Resources and Geosciences, China University of Mining and Technology, Xuzhou 221116, China;3. Huadong Engineering Corporation Limited, Power Construction Corporation of China, Hangzhou 311122, China;1. Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China;2. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092, China;3. Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, College of Civil and Transportation Engineering, Hohai University, Nanjing 210098, China;1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, Zhejiang 310058, China;2. Research Center of Coastal Urban Geotechnical Engineering, Zhejiang University, Hangzhou 310058, China;3. Geotechnical Research Centre, Faculty of Engineering, The University of Western Ontario, London, ON N6A 5B9, Canada;1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310027, PR China;2. College of Civil Engineering and Architecture, Zhejiang University of Technology, Hangzhou 310027, PR China;3. Key Laboratory of Soft Soils and Geoenvironmental Engineering, Ministry of Education, Zhejiang University, Hangzhou 310027, PR China;4. Department of Civil Engineering and Architecture, Saga University, 1 Honjo, Saga 840-8502, Japan;1. Department of Material Engineering, Faculty of Sciences and Technology, University of Médéa, Quartier Ain D''hab, Médéa 26000, Algeria;2. Department of Civil Engineering, Faculty of Technology, University Saad Dahled of Blida, Route de Soumaa, Blida 09000, Algeria |
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| Abstract: | In geotechnical earthquake engineering, wave propagation plays a fundamental role in engineering applications related to the dynamic response of geotechnical structures and to site response analysis. However, current engineering practice is primarily concentrated on the investigation of shear wave propagation and the corresponding site response only to the horizontal components of the ground motion. Due to the repeated recent observations of strong vertical ground motions and compressional damage of engineering structures, there is an increasing need to carry out a comprehensive investigation of vertical site response and the associated compressional wave propagation, particularly when performing the seismic design for critical structures (e.g. nuclear power plants and high dams). Therefore, in this paper, the compressional wave propagation mechanism in saturated soils is investigated by employing hydro-mechanically (HM) coupled analytical and numerical methods. A HM analytical solution for compressional wave propagation is first studied based on Biot’s theory, which shows the existence of two types of compressional waves (fast and slow waves) and indicates that their characteristics (i.e. wave dispersion and attenuation) are highly dependent on some key geotechnical and seismic parameters (i.e. the permeability, soil stiffness and loading frequency). The subsequent HM Finite Element (FE) study reproduces the duality of compressional waves and identifies the dominant permeability ranges for the existence of the two waves. In particular the existence of the slow compression wave is observed for a range of permeability and loading frequency that is relevant for geotechnical earthquake engineering applications. In order to account for the effects of soil permeability on compressional dynamic soil behaviour and soil properties (i.e. P-wave velocities and damping ratios), the coupled consolidation analysis is therefore recommended as the only tool capable of accurately simulating the dynamic response of geotechnical structures to vertical ground motion at intermediate transient states between undrained and drained conditions. |
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| Keywords: | Hydro-mechanically coupling Compressional wave propagation Analytical solution Finite element analysis Vertical site response |
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