A Simplified Energy-based Liquefaction Triggering Model

抄録

As an alternative to the widely used simplified stress-based liquefaction triggering models, this paper presents an overview of a recent study by the authors wherein they propose a model where the imposed loading and ability of the soil to resist liquefaction are quantified in terms of normalized dissipated energy per unit volume of soil (ΔW/σ’_vo). The proposed energy-based model operates within a total stress framework, more directly accounts for factors influencing liquefaction triggering than stress-based models, and overcomes some of the limitations of many previously proposed energy-based triggering models. Energy-based triggering models unite concepts from both stress-based and strain-based procedures, and in its simplified form, the proposed model is implemented similarly to the simplified stress-based models. An updated field case history data base is used to develop probabilistic limit-state curves for the model. These limit-state curves express ΔW/σ’_vo required to trigger liquefaction as a function of corrected cone penetration test tip resistance (q_c1Ncs) for different probabilities of liquefaction (P_L).