CPTu-based approaches for cyclic liquefaction assessment of alluvial soil profiles

• Type: Article in International Scientific Journal
• Date: 2021-12-20

Authors

Catarina Ramos (Author) FEUP; A. Viana da Fonseca (Author) FEUP; Cristiana Ferreira (Author) FEUP

Journal

Title: Soils and Rocks

Vol. 44

Pages: 1-14

ISSN: 1980-9743

Publisher: Associacao Brasileira de Mecanica dos Solos

Indexing

ISI Web of Knowledge - 0 Citations

Scopus - 0 Citations

Other information

Authenticus ID: P-00V-WM8

DOI: 10.28927/sr.2021.070121

Abstract (EN): Over the years, methods to assess cyclic liquefaction potential based on piezocone penetration tests (CPTu) have been developed. This paper presents a comparative study between three CPTu-based methodologies, mainly in terms of the normalization procedures of overburden stresses, equivalent clean sand resistance, and magnitude scaling factor (MSF). Four CPTu profiles from a pilot site in southwest Portugal are thoroughly analysed with different methods, in terms of factor of safety against liquefaction, the Liquefaction Potential Index (LPI), and the Liquefaction Severity Number (LSN). The site presents very heterogeneous soil profiles, composed of alluvial deposits. Due to the presence of significant sand-silt-clay interbedded layers, the influence of transition zones and the use of different soil behaviour type index (I-c) cut-off values were also considered. From these analyses, a set of recommendations is presented for CPTu based liquefaction assessment. Based on the extensive database of CPTu results in the pilot site area, a new classification relating LPI and LSN is proposed to assess liquefaction severity and damage.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 14