Conference paper Open Access

Simplified equivalent soil profiles based on liquefaction performance for shallow-founded structures

Millen, Maxim; Ferreira, Cristiana; Gerace, A.; Viana da Fonseca, António

Earthquake-induced liquefaction is responsible for considerable structural damage. However, conventional liquefaction assessment focuses only on triggering. In this paper, the eval-uation of liquefaction is refocused to consider the performance of buildings. A new hazard-inde-pendent liquefaction classification is proposed where the soil profile is defined as an equivalent 3-layered soil profile. The classification consists of only three features, highly influential to the performance of buildings: the depth of the non-liquefying crust, and the thickness and liquefaction resistance of the potentially liquefiable layer. The influence of these parameters is explored with reference to changes of the ground surface acceleration and foundation bearing capacity. A pro-cedure to obtain the 3-layered soil profile from CPT data is developed and set of soil profile classes are developed for rapid loss assessment purposes. The procedure and classes are demon-strated on a case study site considering 100 CPT from Christchurch and a comparison is made regarding the computed LSN value for the equivalent and CPT profiles.

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