Two-dimensional numerical approach for the vibration isolation analysis of thin walled wave barriers in poroelastic soils |
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| Institution: | 1. KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, 3001 Leuven, Belgium;2. CEDEX, Laboratoria de Geotecnia, Alfonso XII 3, 28014 Madrid, Spain;1. Universidad de Las Palmas de Gran Canaria, Instituto Universitario SIANI, Edificio Central del Parque Científico y Tecnológico del Campus Universitario de Tafira, 35017 Las Palmas de Gran Canaria, Spain;2. KU Leuven, Department of Civil Engineering, Structural Mechanics Section, Kasteelpark Arenberg 40, 3001 Leuven, Belgium;3. KU Leuven, Department of Architecture, Architectural Engineering, Kasteelpark Arenberg 1, 3001 Leuven, Belgium;1. KU Leuven, Department of Civil Engineering, Kasteelpark Arenberg 40, B-3001 Leuven, Belgium;2. Trafikverket, 405 33 Göteborg, Sweden;1. Department of Architecture and Civil Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Kowloon, Hong Kong Special Administrative Region;2. City University of Hong Kong Shenzhen Research Institute, Shenzhen 518057, PR China;3. Mechanical Engineering Department, Texas A&M University, College Station, TX 77843-3123, USA |
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| Abstract: | This paper is concerned with the vibration isolation efficiency analysis of total or partially buried thin walled wave barriers in poroelastic soils. A two-dimensional time harmonic model that treats soils and structures in a direct way by combining appropriately the conventional Boundary Element Method (BEM), the Dual BEM (DBEM) and the Finite Element Method (FEM) is developed to this aim. The wave barriers are impinged by Rayleigh waves obtained from Biot’s poroelasticity equations assuming a permeable free-surface. The suitability of the proposed model is justified by comparison with available previous results. The vibration isolation efficiency of three kinds of wave barriers (open trench, simple wall, open trench-wall) in poroelastic soils is studied by varying their geometry, the soil properties and the frequency. It is found that the efficiency of these wave barriers behaves similarly to these in elastic soils, except for high porosities and small dissipation coefficients. The efficiency of open trench-wall barriers can be evaluated neglecting their walls if they are typical sheet piles. This does not happen with walls of bigger cross-sections, leading in general to efficiency losses. Likewise, increasing the burial depth to trench depth ratio has a negative impact on the efficiency. |
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| Keywords: | Vibration isolation Poroelasticity Rayleigh waves Thin structures Dual Boundary Element Method BEM–FEM coupling |
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