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Undrained cyclic laboratory behavior of sandy soils

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doi: 10.3390/geosciences9120512
Authors:Castelli, Francesco; Cavallaro, Antonio Maria Francesco; Grasso, Salvatore; Lentini, Valentina
Author Affiliations:Primary:
University of Enna Kore, Faculty of Engineering and Architecture, Enna, Italy
Other:
Institute of Cultural Heritage Sciences, Italy
University of Catania, Italy
Volume Title:Geosciences (Basel)
Source:Geosciences (Basel), 9(12). Publisher: Multidisciplinary Digital Publishing Institute (MDPI), Basel, Switzerland. ISSN: 2076-3263
Publication Date:2019
Note:In English. Part of a special issue entitled New perspectives in the definition/evaluation of seismic hazard through analysis of the environmental effects induced by earthquakes, edited by Porfido, S., et al.. 74 refs.; illus., incl. 4 tables, geol. sketch maps
Summary:The complex cyclic shear stress path experienced by the soil during an earthquake, which could also induce liquefaction phenomena, can be approximated in the laboratory only by using sophisticated testing apparatuses. Cyclic triaxial tests have been widely used, especially for coarse grained soils, as in this study. In the framework of the design for the seismic retrofitting of the "Ritiro viaduct" foundations along the A20 motorway connecting Messina with Palermo (Italy), a soil liquefaction study was also carried out. With this aim, a detailed geological and geotechnical characterization of the area was performed by in situ and laboratory tests, including seismic dilatometer Marchetti tests (SDMTs), the combined resonant column (RCT) and cyclic loading torsional shear tests (CLTSTs), and undrained cyclic loading triaxial tests (CLTxTs). In particular, the paper presents the results of cyclic triaxial tests carried out on isotropically consolidated specimens of a sandy soil. The seismic retrofitting works include the reinforcement of the foundation and replacement of the decks with newly designed type and structural schemes, mixed steel, and concrete with continuous girder. During the investigation, data were acquired for the characterization of materials, for the definition of degradation phenomena with the relative identification of possible causes, and for the estimation of the residual performance characteristics of the building. The structural campaign of investigations necessary to determine all of the key parameters useful for a correct definition of the residual performance capabilities of the work was divided into two phases: One in situ and one in the laboratory.
Subjects:Apparent resistivity; Clastic sediments; Clay; Coarse-grained materials; Concrete; Construction materials; Cyclic loading; Degradation; Dilatometers; Earthquakes; Elastic constants; Epicenters; Experimental studies; Foundations; Fractures; Gravel; In situ; Infrastructure; L'Aquila earthquake 2009; Laboratory studies; Liquefaction; Loading; Niigata earthquake 1964; Roads; Sand; Sand boils; Sediments; Seismic intensity; Shear modulus; Shear stress; Shear tests; Silt; Soils; Steel; Torsion; Triaxial tests; Young's modulus; Europe; Italy; Messina Italy; Sicily Italy; Southern Europe; Strait of Messina; Emilia Romagna earthquake 2012; Messina earthquake 1908
Coordinates:N375000 N382000 E0154500 E0152000
Record ID:870294-13
Copyright Information:GeoRef, Copyright 2021 American Geosciences Institute.
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