Publication Date:
2023-02-21
Description:
This material may be downloaded for personal use only. Any other use requires prior permission of the American Society of Civil Engineers. This material may be found at https://ascelibrary.org/doi/10.1061/%28ASCE%29GT.1943-5606.0002801
Description:
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 piezocone (CPTU) and flat dilatometer (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.
Description:
Published
Description:
04022038
Description:
5T. Sismologia, geofisica e geologia per l'ingegneria sismica
Description:
JCR Journal
Repository Name:
Istituto Nazionale di Geofisica e Vulcanologia (INGV)
Type:
article
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