EGU21-9771
https://doi.org/10.5194/egusphere-egu21-9771
EGU General Assembly 2021
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

PERL: A multilevel strategy for liquefaction hazard assessment in complex stratigraphic successions

Chiara Varone1, Anna Baris2, Maria Chiara Caciolli1, Stefania Fabozzi1, Iolanda Gaudiosi1, Marco Marcini1, Luca Martelli3, Giuseppe Modoni2, Massimiliano Moscatelli1, Luca Paolella2, Maurizio Simionato1, Rose Line Spacagna1, and Roberto Razzano1
Chiara Varone et al.
  • 1Institute of Environmental Geology and Geoengineering IGAG, Italian National Research Council CNR, Montelibretti, Italy (chiara.varone@cnr.it)
  • 2Dep. of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Cassino, Italy,
  • 3Geological, Seismic and Soil Survey, Emilia-Romagna Region, Bologna, Italy

In May and June 2012, Emilia region (Italy) was struck by a seismic crisis characterized by more than 2000 earthquakes with two main shocks (20 May and 29 May events with ML 5.9 and 5.8, respectively) and several earthquake-induced effects. Relevant liquefaction events were observed all over the area showing a maximum intensity at San Carlo and Mirabello, two main hamlets in the Terre del Reno Municipality. In this work, a methodology is proposed for assessing liquefaction susceptibility in wide areas characterized by complex geo-stratigraphic conditions through a multi-level approach based on simplified models. To this aim, extensive geological studies and more than one thousand geophysical and geotechnical surveys available from previous studies have been collected in a dedicated geographical information system. The database is structured to guarantee data and metadata harmonization and standardization, useful for the realization of an integrated and interoperable system progressively supplemented with new information. Preliminary 2D and 3D high resolution geological and geotechnical models are elaborated to reconstruct the complex subsoil setting of Terre del Reno area.  This study forms the base for the 2D numerical modelling carried out with a finite difference code (FLAC) to identify the mechanism of pore pressure increase and of liquefaction triggering. The rationale behind this study concerns the definition of a simplified approach based on synthetic indicators. Specifically, starting from parametric analyses, the role of different variables on the triggering process is evaluated together with the definition of set of thresholds able to model the occurrence of liquefaction effects. The spatial variability of the soil properties, layering and mechanical characteristics is considered with a geo-statistical approach. A comparison between the liquefaction effects observed in 2012 and the results obtained from calculations is performed for demonstrating the reliability of the proposed approach in extensively simulating a liquefaction occurrence.

How to cite: Varone, C., Baris, A., Caciolli, M. C., Fabozzi, S., Gaudiosi, I., Marcini, M., Martelli, L., Modoni, G., Moscatelli, M., Paolella, L., Simionato, M., Spacagna, R. L., and Razzano, R.: PERL: A multilevel strategy for liquefaction hazard assessment in complex stratigraphic successions, EGU General Assembly 2021, online, 19–30 Apr 2021, EGU21-9771, https://doi.org/10.5194/egusphere-egu21-9771, 2021.

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