Liquefaction evaluation of Aveiro sands from SCPTU and SDMT tests

The paper analyses the results of the liquefaction potential evaluation at the harbour of Aveiro (Portugal) from distinct in situ testing approaches. The study was based on the results of CPTu/SCPTu tests and DMT/SDMT tests, including the measurement of shear wave velocity (VS), taking into account the grain size distribution curves. The analysis was performed to estimate the cyclic resistance ratio (CRR) from in situ tests, and to compare the CRR with the cyclic stress ratio (CSR), with the seismic action evaluated according to Portuguese National Annex of the Eurocode 8. These two parameters were used to assess the liquefaction safety factor (FS) and the liquefaction potential index (LPI). In addition, the liquefaction severity number (LSN) was also used to quantify the effects of liquefaction and consequent land damage by estimating the volumetric strains. The estimate of the cyclic resistance ratio CRR from DMT appears to be interesting since the horizontal stress index KD is sensitive to a factors which are known to increase liquefaction resistance.