Probabilistic Evaluation of Damage Potential in Earthquake-Induced Liquefaction in A 3-D Soil Deposit

摘要

A probabilistic model is proposed to evaluate the risk of liquefaction at a site and to limit or eliminate damage during earthquake-induced liquefaction. The model is extended to consider three-dimensional nonhomogeneous soil properties. Literature is surveyed to identify the parameters relevant to the liquefaction phenomenon, including: (1) soil parameters; (2) parameters required to consider laboratory test and sampling effects; and (3) loading parameters. The fundamentals of risk-based design concepts pertinent to liquefaction are reviewed. A detailed statistical evaluation of the soil parameters in the proposed liquefaction model is provided and the uncertainty associated with the estimation of in situ relative density is evaluated for both direct and indirect methods. In the evaluation of the liquefaction potential of a site, it was found that the uncertainties in the load parameters could be higher than those in the resistance parameters.