Liquefaction is a loss of soil strength or stiffness that can occur in susceptible saturated soils during earthquake shaking.
Definition
Liquefaction describes a loss of strength or stiffness that may occur in susceptible saturated soils during earthquake shaking. Evaluation depends on soil type and density, groundwater conditions, expected ground motion, and the methods and criteria selected for the project. A geotechnical professional uses site investigation information and states the assumptions and limitations of the assessment. Potential effects may be relevant to foundations, ground movement, utilities, and project measures, but the findings are specific to the site and purpose. Liquefaction is not simply any earthquake-related ground movement, and a screening result is not a complete design evaluation. Owners can use early screening to identify whether more investigation, analysis, or coordination belongs in the scope and schedule. The ASCE resource provides a professional engineering context, while site-specific conclusions require applicable project data and expertise.
How owners use it
- Identify whether site investigation and geotechnical analysis should address susceptible saturated soils and shaking conditions.
- Coordinate findings with foundation, utility, and project planning discussions where relevant.
- Example: If a proposal includes 2 field days for screening and 3 additional days for analysis, the listed effort is 2 + 3 = 5 days.
- Record the assumptions, data limits, and intended use of screening or analysis results.
