In the engineering geology field increased attention has been posed in recent years to potential liquefaction mitigationinterventionsinsusceptiblesandformations.Insiltysandsthisisamajorchallengebecause,asthe finescontentincreases,vibratorymethodsfordensificationbecomeprogressivelylesseffective.Analternative mitigationtechnique canbetheinstallationofRammedAggregatePier® (RAP)columnsthatcanincrease the resistanceofthesoil,accountingforitslateralstressincreaseandforthestiffnessincreasefromsoilandRAP compositeresponse.Toinvestigatetheinfluenceofthesefactorsonliquefactionresistance,full-scaleblasttests wereperformedatasiltysandsiteinBondeno(Ferrara,Italy)whereliquefactionwasobservedafterthe2012 Emilia-Romagna earthquake. A multidisciplinary team of forty researchers carried out devoted experimental activitiesaimedatbetterunderstandingtheliquefactionprocessatthefieldscaleandtheeffectivenessofthe treatmentusinginter-relatedmethods.Bothnaturalandimprovedareaswereinvestigatedbyin-situtestsand 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 effectivenessduetotheimprovementofsoilpropertieswithintheliquefiablelayerandaconsequentreduction 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

Sintesi della ricerca internazionale su strategie di mitigazione della liquefazione cosismiche di sabbie svolta attraverso la liquefazione indotta da esplosioni in sabbie fluviali quaternarie nell’Avanfossa Appenninica, in un sito in cui la liquefazione naturale si era già manifestata durante i sismi del maggio 2012. Si è operato il confronto fra i fenomeni di liquefazione indotta in sabbie di riempimento di canale fluviale in condizioni naturali e dopo miglioria della risposta cosismica mediante la messa in opera di colonne drenanti.

Blast-induced liquefaction in silty sands for full-scale testing of ground improvement methods: Insights from a multidisciplinary study

Luca Minarelli;Marco Stefani;
2020

Abstract

In the engineering geology field increased attention has been posed in recent years to potential liquefaction mitigationinterventionsinsusceptiblesandformations.Insiltysandsthisisamajorchallengebecause,asthe finescontentincreases,vibratorymethodsfordensificationbecomeprogressivelylesseffective.Analternative mitigationtechnique canbetheinstallationofRammedAggregatePier® (RAP)columnsthatcanincrease the resistanceofthesoil,accountingforitslateralstressincreaseandforthestiffnessincreasefromsoilandRAP compositeresponse.Toinvestigatetheinfluenceofthesefactorsonliquefactionresistance,full-scaleblasttests wereperformedatasiltysandsiteinBondeno(Ferrara,Italy)whereliquefactionwasobservedafterthe2012 Emilia-Romagna earthquake. A multidisciplinary team of forty researchers carried out devoted experimental activitiesaimedatbetterunderstandingtheliquefactionprocessatthefieldscaleandtheeffectivenessofthe treatmentusinginter-relatedmethods.Bothnaturalandimprovedareaswereinvestigatedbyin-situtestsand 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 effectivenessduetotheimprovementofsoilpropertieswithintheliquefiablelayerandaconsequentreduction 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
2020
Amoroso, Sara; Rollins, Kyle M.; Andersen, Paul; Gottardi, Guido; Tonni, Laura; García Martínez, Maria F.; Wissmann, Kord; Minarelli, Luca; Comina, Cesare; Fontana, Daniela; Marco De Martini, Paolo; Monaco, Paola; Pesci, Arianna; Sapia, Vincenzo; Vassallo, Maurizio; Anzidei, Marco; Carpena, Andrea; Cinti, Francesca; Civico, Riccardo; Coco, Igino; Conforti, Dario; Doumaz, Fawzi; Giannattasio, Fabio; Di Giulio, Giuseppe; Foti, Sebastiano; Loddo, Fabiana; Lugli, Stefano; Manuel, Maria R.; Marchetti, Diego; Mariotti, Mauro; Materni, Valerio; Metcalfe, Brian; Milana, Giuliano; Pantosti, Daniela; Pesce, Antonio; Salocchi, Aura C.; Smedile, Alessandra; Stefani, Marco; Gabrieletarabusi, ; Teza, Giordano
File in questo prodotto:
File Dimensione Formato  
Amoroso et al 2019_Engineering Geology.pdf

solo gestori archivio

Descrizione: Articolo Completo
Tipologia: Full text (versione editoriale)
Licenza: NON PUBBLICO - Accesso privato/ristretto
Dimensione 8 MB
Formato Adobe PDF
8 MB Adobe PDF   Visualizza/Apri   Richiedi una copia
1-s2.0-S0013795219313523-main.pdf

accesso aperto

Tipologia: Pre-print
Licenza: PUBBLICO - Pubblico con Copyright
Dimensione 4.45 MB
Formato Adobe PDF
4.45 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/2418500
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 31
  • ???jsp.display-item.citation.isi??? 26
social impact