Blast-induced liquefaction in silty sands for full-scale testing of ground improvement methods: Insights from a multidisciplinary study
| Autor: | Maurizio Vassallo, Giordano Teza, Vincenzo Sapia, Aura Cecilia Salocchi, Francesca Romana Cinti, Mauro Mariotti, Alessandra Smedile, Paolo Marco De Martini, Giuliano Milana, Sara Amoroso, Diego Marchetti, Fawzi Doumaz, Maria R. Manuel, Kord J. Wissmann, Cesare Comina, F. Loddo, Dario Conforti, Daniela Pantosti, Guido Gottardi, Paola Monaco, Kyle M. Rollins, Marco Anzidei, Marco Stefani, Igino Coco, Arianna Pesci, Brian Metcalfe, Andrea Carpena, Valerio Materni, Sebastiano Foti, Antonio Pesce, Giuseppe Di Giulio, Gabriele Tarabusi, Luca Minarelli, Stefano Lugli, Fabio Giannattasio, Daniela Fontana, Riccardo Civico, Paul Andersen, Laura Tonni, María Fernanda García Martínez |
|---|---|
| Přispěvatelé: | Amoroso S., Rollins K.M., Andersen P., Gottardi G., Tonni L., García Martínez M.F., Wissmann K., Minarelli L., Comina C., Fontana D., De Martini P.M., Monaco P., Pesci A., Sapia V., Vassallo M., Anzidei M., Carpena A., Cinti F., Civico R., Coco I., Conforti D., Doumaz F., Giannattasio F., Di Giulio G., Foti S., Loddo F., Lugli S., Manuel M.R., Marchetti D., Mariotti M., Materni V., Metcalfe B., Milana G., Pantosti D., Pesce A., Salocchi A.C., Smedile A., Stefani M., Tarabusi G., Teza G. |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Stratigraphy
Liquefazione indotta Rammed aggregate pier Multidisciplinary study Blast test Emilia-Romagna earthquake Ground improvement Liquefaction Rammed aggregate piers Silty sands Stratigrafia Stratigrafia Sedimentologia Liquefazione indotta Riduzione del potenziale di liquefazione Italia Multidisciplinary approach Liquefaction Blast test Rammed aggregate piers Ground improvement Silty sands Emilia-Romagna earthquake Soil properties Geotechnical engineering Stratigraphy Sedimentology Liquefaction Blast test Rammed aggregate piers Ground improvement Italy Aggregate (composite) Engineering geology Ambientale Geology Sedimentology Geotechnical Engineering and Engineering Geology PE10_5 Sedimentologia Italia Riduzione del potenziale di liquefazione Italy Improvement methods Environmental science Full scale testing |
| Popis: | In the engineering geology field increased attention has been posed in recent years to potential liquefaction mitigation interventions in susceptible sand formations. In silty sands this is a major challenge because, as the fines content increases, vibratory methods for densification become progressively less effective. An alternative mitigation technique can be the installation of Rammed Aggregate Pier® (RAP) columns that can increase the resistance of the soil, accounting for its lateral stress increase and for the stiffness increase from soil and RAP composite response. To investigate the influence of these factors on liquefaction resistance, full-scale blast tests were performed at a silty sand site in Bondeno (Ferrara, Italy) where liquefaction was observed after the 2012 Emilia-Romagna earthquake. A multidisciplinary team of forty researchers carried out devoted experimental activities aimed at better understanding the liquefaction process at the field scale and the effectiveness of the treatment using inter-related methods. Both natural and improved areas were investigated by in-situ tests and later subjected to controlled blasting. The blast tests were monitored with geotechnical and geophysical instrumentation, topographical surveying and geological analyses on the sand boils. Results showed the RAP effectiveness due to the improvement of soil properties within the liquefiable layer and a consequent reduction of the blast-induced liquefaction settlements, likely due to soil densification and increased lateral stress. The applied multidisciplinary approach adopted for the study allowed better understanding of the mechanism involved in the liquefaction mitigation intervention and provided a better overall evaluation of mitigation effectiveness. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|