ANALYSIS OF PORE PRESSURE GENERATION AND DISSIPATION IN COHESIONLESS MATERIALS DURING SEISMIC LOADING |
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Authors: | A. PECKER J. H. PREVOST L. DORMIEUX |
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Affiliation: | 1. Géodynamique et Structure , 157 Rue des Blains, 92220 Bagneux, France;2. Department of Civil and Environmental Engineering , Princeton University , Princeton New Jersey 08544-5263, USA;3. CERMMO, Ecole Nationale des Fonts et Chaussées , 6 Avenue Blaise Pascal Cité Descartes-Champs-sur-Marne, 77455 Marne-La-Vallée Cedex 2, France |
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Abstract: | The earthquake loading of a shallow foundation resting on top of a cohesionless layer creates cyclic variations in the shear force and overturning moment acting on the supporting soil. These loads induce a tendency for volume change which, in turn, depending on the drainage conditions and material permeability, may cause in addition to a cyclic pore pressure variation a progressive pore pressure buildup. The paper develops an efficient and elegant way, based on a multiple time scale analysis, of solving this fully coupled problem. The theoretical solution is implemented in a finite element code and is applied to predict the pore pressure development and dissipation under a bridge pier foundation for which it was essential to limit the pore pressure increase. |
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Keywords: | Cohesionless material coupled problem earthquake loading pore pressure |
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