Probabilistic Liquefaction Potential Evaluation Considering Soil Spatial Variation

Abstract eng:
Soil Liquefaction is one of the major concerns of the damage to the structures in saturated sand deposits during earthquakes. The simplified methods developed for the assessment of liquefaction potential rely on the limit states that are generally established with built-in conservatism and with great deal of subjectivity. Well-known SPT and CPT-based methods are widely used in the design practice for this purpose due to their simplicity and reasonable predictive capability. However, these methods do not account for various sources of uncertainties explicitly. In addition, evaluations are generally made only at the locations of test results and are generalized for the whole region where spatial variation of these results may be significant. In the present study, the overall characteristics of the spatial variability and the uncertainties involved are mathematically modeled using random field theory and geostatistics methods. The liquefaction potential is evaluated probabilistically based on simplified design approaches as well as considering various sources of uncertainties related to the modeling errors and measurement errors.

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