Comparative analysis of liquefaction susceptibility assessment methods based on the investigation on a pilot site in the greater Lisbon area
| Autor: | Carlos Rodrigues, Sara Amoroso, Cristiana Ferreira, António Viana da Fonseca, Ana Sofia Saldanha, Catarina Ramos |
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| Rok vydání: | 2019 |
| Předmět: |
021110 strategic
defence & security studies Hydrogeology 0211 other engineering and technologies Borehole Liquefaction 02 engineering and technology Building and Construction Geotechnical Engineering and Engineering Geology Soil type Penetrometer law.invention Factor of safety Geophysics Cyclic stress ratio law Assessment methods Environmental science Geotechnical engineering Civil and Structural Engineering |
| Zdroj: | Bulletin of Earthquake Engineering |
| ISSN: | 1573-1456 1570-761X |
| DOI: | 10.1007/s10518-019-00721-1 |
| Popis: | In Portugal, particularly in the greater Lisbon area, there are widespread alluvial sandy deposits, which need to be carefully assessed in terms of liquefaction susceptibility and risk zonation. For this purpose, a pilot site has been set up, as part of the European H2020 LIQUEFACT project. An extensive database of geological and geotechnical reports was collected and a comprehensive site investigation campaign was carried out, including boreholes with standard penetration (SPT), piezocone penetrometer and seismic dilatometer tests as well as geophysical methods, complemented by undisturbed soil sampling for laboratory characterisation. The assessment of liquefaction susceptibility based on field tests was made using the simplified procedure, considering the factor of safety against liquefaction (FSliq), which relates the cyclic resistance ratio (CRR) with the cyclic stress ratio (CSR). While the computation of the CSR is relatively straightforward, the reliability of the CRR strongly depends on the adopted in situ testing technique. Alternative approaches to liquefaction assessment have been proposed, based on quantitative liquefaction damage indexes, namely the Liquefaction Potential Index (LPI) and Liquefaction Severity Number. In this paper, the geotechnical field data is integrated in these distinct approaches to liquefaction assessment. A comparative and in-depth analysis of the conventional approach is presented and the inclusion of specific information on soil type, as a means to overcome the observed differences, is discussed particularly for SPT and VS results. The combination of these criteria enabled to clearly identify the most critical layers, in terms of liquefaction potential and severity. |
| Databáze: | OpenAIRE |
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