Numerical Modelling of Seismic Site Effects Incorporating Non-linearity and Groundwater Level Changes

Dominik Ehret; Joachim Rohn; Dieter Hannich; Carlos Grandas; Gerhard Huber

doi:10.1007/s12583-010-0146-5

Volume 21 Issue 6

Dec 2010

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Journal of Earth Science > 2010 > 21(6): 931-940.

Dominik Ehret, Joachim Rohn, Dieter Hannich, Carlos Grandas, Gerhard Huber. Numerical Modelling of Seismic Site Effects Incorporating Non-linearity and Groundwater Level Changes. Journal of Earth Science, 2010, 21(6): 931-940. doi: 10.1007/s12583-010-0146-5

Citation:

Dominik Ehret, Joachim Rohn, Dieter Hannich, Carlos Grandas, Gerhard Huber. Numerical Modelling of Seismic Site Effects Incorporating Non-linearity and Groundwater Level Changes. Journal of Earth Science, 2010, 21(6): 931-940. doi: 10.1007/s12583-010-0146-5

Citation:

Dominik Ehret, Joachim Rohn, Dieter Hannich, Carlos Grandas, Gerhard Huber. Numerical Modelling of Seismic Site Effects Incorporating Non-linearity and Groundwater Level Changes. Journal of Earth Science, 2010, 21(6): 931-940. doi: 10.1007/s12583-010-0146-5

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Numerical Modelling of Seismic Site Effects Incorporating Non-linearity and Groundwater Level Changes

doi: 10.1007/s12583-010-0146-5

1.
Department of Applied Geology, University of Erlangen-Nuremberg, Schlossgarten 5, 91054, Erlangen, Germany
2.
Department of Applied Geology, University (TH) of Karlsruhe, Kaiserstr, 12, 76128, Karlsruhe, Germany
3.
Institute of Soil and Rock Mechanics, University (TH) of Karlsruhe, Kaiserstr, 12, 76128, Karlsruhe, Germany

Funds: This study was supported by the German Research Foundation (DFG), the State of Baden-Württemberg, and the University (TH) of Karlsruhe

More Information

Corresponding author: Dominik Ehret, ehret@geol.uni-erlangen.de
Received Date: 05 Jun 2010
Accepted Date: 10 Aug 2010
Publish Date: 01 Dec 2010

Abstract

Abstract

In the past decades, the necessity for detailed earthquake microzonation studies was recognized worldwide. Therefore, different approaches were established and applied. Unfortunately, the majority of these approaches are not based on pre-existing field data but require extensive seismic measurements and investigations. Furthermore, these approaches incorporate non-linearity inadequately and cannot take groundwater level changes into account. For this purpose, notably numerical models are most suitable. These models require a good knowledge of the local geological conditions (especially of the uppermost unconsolidated units), information about the geotechnical parameters of these units, and a hydrogeological model of the investigated area. Most of this information can be obtained from geotechnical investigations and surveys that have already been carried out in most densely populated areas. In a case study for Bucharest City, non-linear analyses were performed using software that is based on the visco-hypoplastic constitutive law. The results indicate that groundwater level changes have an important influence on duration and amplitude of ground response and thus should be considered for seismic microzonation studies. This approach can be used to display site effects and to identify different microzones taking different earthquake magnitudes and groundwater levels into account.
- microzonation,
- site effect,
- visco-hypoplasticity,
- non-linearity,
- Bucharest,
- Romania

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References(40)

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