Comparative Study of CPTU and SDMT in Liquefaction-Prone Silty Sands with Ground Improvement
| Autor: | Sara Amoroso, Maria F. García Martínez, Paola Monaco, Laura Tonni, Guido Gottardi, Kyle M. Rollins, Luca Minarelli, Diego Marchetti, Kord J. Wissmann |
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| Přispěvatelé: | Sara Amoroso, Maria F. García Martínez, Paola Monaco, Laura Tonni, Guido Gottardi, Kyle M. Rollins, Luca Minarelli, Diego Marchetti, Kord J. Wissmann |
| Rok vydání: | 2022 |
| Předmět: |
In situ test
Silty sand controlled blasting liquefaction assessment Rammed Aggregate Piers (RAPs) dense granular columns silty sands Geotechnical Engineering and Engineering Geology controlled blasting in situ tests liquefaction assessment Rammed Aggregate Piers (RAPs) silty sands dense granular columns General Environmental Science Dense granular columns in situ tests |
| Popis: | Following the 2012 Emilia-Romagna seismic sequence, widespread liquefaction of silty sands was observed, providing the opportunity to enhance our knowledge of the influence of fines content on seismic hazard and mitigation works. This paper presents the results of a thorough geotechnical investigation performed in connection with full-scale controlled blast tests in Bondeno, Italy, a small village that suffered liquefaction in 2012. Piezocone (CPTU) and seismic dilatometer (SDMT) tests were performed in natural and improved soils after rammed aggregate pier (RAP) treatment to a depth of 9.5 m to provide accurate soil characterization, evaluate liquefaction, and verify the effectiveness of the ground improvement. The combined use of CPTU and DMT data provided reliable estimates of the overconsolidation ratio and at-rest earth pressure coefficient and highlighted the soil improvement in silty sands between 4 and 9 m in depth. Shear-wave velocity measurements showed a low sensitivity to RAP installation. The treatment effectiveness was also confirmed by the use of the simplified procedures for liquefaction assessment, underlining the important influence of the adopted fines profile and by the blast-induced liquefaction. CPTU and DMT parameters remained approximately unchanged between the piers after the detonation. |
| Databáze: | OpenAIRE |
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