Seismic liquefaction risk evaluation

Leverage your SPT, CPT, Vs and dynamic penetrometers (Panda® and Grizzly® DPSH) to assess the seismic risk of liquefaction with a robust and traceable approach.

The Websprint© liquefaction module allows:

• FSliq safety factor assessment (CSR/CRR);
• Estimation of post-seismic settlements;
• Calculating the Liquefaction Potential Index (LPI);
• Analysis of susceptibility to liquefaction.

All this is consistent with the NCEER methodology (Youd et al., 2001) and the French AFPS recommendations (CT45, 2021).

Websprint© is currently the only software that allows an integrated exploitation of data from:

• Standard Penetration Test (SPT) (ISO 22476-3; ASTM D1586);
• Cone Penetration Test (CPT) (ISO 22476-1; ASTM D5778);
• Shear wave velocity (Vs) (Andrus & Stokoe, 2000; Kayen et al., 2013);
• Dynamic penetrometers (PANDA®, DPSH, Grizzly®) (ISO 22476-2).

Geographical and geological data:

• Fill in the location of your project, the type of soil and the Eurocode 8 assistant, will allow you to set up the seismic hypotheses in a coherent way and help you calculate the PGA (Peak Ground Acceleration) and the MSF (Magnitude Scaling Factor)
• Fill in the lithological profile and the positioning of the water table in order to analyze the susceptibility to the occurrence of the liquefaction phenomenon.

Geotechnical surveys:

Work with sounding results:

• Standard penetration test (SPT) (ISO 22476-3;  ASTM D1586);
• CPT (ISO EN 22476-1; ASTM D5778-20);
• Shear wave velocity (Vs);
• Panda® and Grizzly® Dynamic Penetrometers® (ISO EN 22476-2).

Implemented calculation methods:

Based on the geotechnical soundings available on the site studied, apply:

• Method based on the results of the SPT (Seed et al. 1985; Youd et al. 2001);
• CPT-based methods (Robertson & Wride, 1998; Youd et al. 2001);
• Method based on Vs values (Andrus & Stokoe, 2000; Kayen et al. 2013; PEER Report 2013/01);
• Method based on the results of dynamic penetration tests (Panda® and Grizzly® DPSH) based on correlations with the SPT and the CPT (Lepetit, 2001; Villavicencio et al. 2010).

Productivity:

Fully exploit your geotechnical surveys (SPT, CPT, Vs or dynamic cone penetrometers) to test several hypotheses and models. Websprint© allows you to systematically explore the risk of liquefaction, to understand its sensitivity to geotechnical parameters, and to document your technical choices :

• Automated analysis of calculation assumptions and in-situ data;
• Backup and reuse of projects and reports;
• Easier collaboration with your teams and partners.