Location
Arlington, Virginia
Date
14 Aug 2008, 2:15pm - 4:00pm
Abstract
Italian seismic regulatory guidance (O.P.C.M. n. 3274 of 20 March 2003, O.P.C.M. n. 3519 of 28 April 2006, implemented within the “Norme Tecniche per le Costruzioni” – D.M. of 14 January 2008) which conforms to European guidance (Eurocode 8), advises a seismic classification of foundation soils through the Vs30 value or alternatively the Nspt value. Several correlations between the Nspt parameter and the Vs parameter are known in literature (Otha & Goto, 1978; Imai & Tonouchi, 1982; Ohsaki & Iwasaki, 1977; Seed, 1983). Each of these correlations can only be applied in certain geological-technical contexts. The validity of these correlations should be discussed considering that geophysical investigations are undertaken under elastic deformation conditions where induced stress causes reversible deformations. Instead, SPT investigations cause rupture of the investigated material and they cannot be conducted within all types of deposits. This note presents the results obtained by comparison of Vs values from SPT investigations and the Vs values from down-hole investigations measured on the same vertical and at the same depth. The study is based on a great quantity of data (153 pairs of Nspt-Vs values) which were acquired from different geological-technical contexts. The data were acquired within the VEL project of the Tuscany Region (Central Italy) aimed at assessing local effects in areas where different seismic hazards exist. Limits and applicability of these empirical correlations are discussed.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
6th Conference of the International Conference on Case Histories in Geotechnical Engineering
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2008 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Rainone, M. L.; Torrese, P.; Signanini, P.; and Pizzica, F., "Seismic Characterisation of Soils with SPT: Comparison of Calculated vs Values and Measured vs Values" (2008). International Conference on Case Histories in Geotechnical Engineering. 37.
https://scholarsmine.mst.edu/icchge/6icchge/session07/37
Seismic Characterisation of Soils with SPT: Comparison of Calculated vs Values and Measured vs Values
Arlington, Virginia
Italian seismic regulatory guidance (O.P.C.M. n. 3274 of 20 March 2003, O.P.C.M. n. 3519 of 28 April 2006, implemented within the “Norme Tecniche per le Costruzioni” – D.M. of 14 January 2008) which conforms to European guidance (Eurocode 8), advises a seismic classification of foundation soils through the Vs30 value or alternatively the Nspt value. Several correlations between the Nspt parameter and the Vs parameter are known in literature (Otha & Goto, 1978; Imai & Tonouchi, 1982; Ohsaki & Iwasaki, 1977; Seed, 1983). Each of these correlations can only be applied in certain geological-technical contexts. The validity of these correlations should be discussed considering that geophysical investigations are undertaken under elastic deformation conditions where induced stress causes reversible deformations. Instead, SPT investigations cause rupture of the investigated material and they cannot be conducted within all types of deposits. This note presents the results obtained by comparison of Vs values from SPT investigations and the Vs values from down-hole investigations measured on the same vertical and at the same depth. The study is based on a great quantity of data (153 pairs of Nspt-Vs values) which were acquired from different geological-technical contexts. The data were acquired within the VEL project of the Tuscany Region (Central Italy) aimed at assessing local effects in areas where different seismic hazards exist. Limits and applicability of these empirical correlations are discussed.
