Mapping of Liquefaction-Induced Deformations for Seismic Risk Assessment
Publication: Geo-Congress 2022
ABSTRACT
Seismic risk assessment of critical infrastructure requires information on the structure and its vulnerability, probability of failure, and hazard. When considering underground infrastructure such as pipelines, the occurrence of liquefaction will directly impact its performance due to the induced permanent deformation. Intensity measures such as peak ground acceleration (PGA) and peak ground velocity (PGV) are already included in several fragility curves for seismic risk assessment. Nevertheless, estimation of this permanent ground deformation (PGD) requires additional data. One of the sources of permanent ground deformation is liquefaction. Liquefaction can cause lateral spreading and post-liquefaction settlement that depend on the shear and volumetric deformation the soil experiences during the cyclic loading. There are several simplified procedures that can be used to assess liquefaction potential and both types of deformation, but they depend on how well-characterized the soils in the area of interest are. Mapping of liquefaction can be based on a critical layer or on a soil profile. Besides, approaches can be deterministic or probabilistic considering uncertainty in the seismic scenarios and soil conditions. This paper is aimed to summarize these procedures, pointing out their strengths and limitations. A methodology is defined for estimation of PGD and mapping that can lead to development of fragility relationships. A case study is presented for the City of Valparaiso, in Chile.
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Geo-Congress 2022
Pages: 251 - 259
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Published online: Mar 17, 2022
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