Liquefaction analysis and damage evaluation of embankment-type structures

Abstract

The increasing importance of performance-based earthquake engineering analysis points out the necessity to assess quantitatively the risk of liquefaction of embankment-type structures. In this extreme scenario of soil 2 Ioanna Rapti et al. liquefaction, devastating consequences are observed, e.g. excessive settlements, lateral spreading and slope instability. The present work discusses the global dynamic response and interaction of an earth structure-foundation system, so as to determine quantitatively the collapse mechanism due to foundation's soil liquefaction. A levee-foundation system is simulated and the influence of characteristics of input ground motion, as well as, of the position of liquefied layer on the liquefaction-induced failure is evaluated. For the current levee model, its induced damage level (i.e. induced crest settlements) is strongly related to both liquefaction apparition and dissipation of excess pore water pressure on the foundation. The respective role of input ground motion characteristics is a key component for soil liquefaction apparition, as long duration of mainshock can lead to important nonlinearity and extended soil liquefaction. A circular collapse surface is generated inside the liquefied region and extends towards the crest in both sides of the levee. Even so, when the liquefied layer is situated in depth, no significant effect on the levee response is found. This research work provides a reference case study for seismic assessment of embankment-type structures subjected to earthquake and proposes a high-performance computational framework accessible to engineers.Keywords Dynamic analysis · Nonlinear coupled hydromechanical behavior · Soil liquefaction · Earthquake loading · strain localization · instability · FE modeling Liquefaction analysis and damage evaluation of embankment-type structures 3

Physical Modelling of Earthquake-induced Liquefaction on Uniform Soil Deposit and Settlement of Earth Structures

“…There is no significant difference between the settlement found on the tip and the centre of the crest. This finding is in line with Rapti et al (2018) which explain that the depth of the liquefiable layer holds vital roles in determining the seismic response of the embankment. When the liquefiable layer located at the deep layer, there is no significant response found on the embankment.…”

Survival analysis of a liquefiable embankment subjected to sequential earthquakes

“…where h 0 (t) is the baseline hazard and β is a parameter that represents the 163 effect of covariate on the outcome. Assuming that one event occurs at a time 164 t i , the parameter β can be calculated by solving the partial likelihood: [43], Lopez-Caballero and Khalil [34], and is detailed in Figure 2.…”

Fragility Assessment of Traffic Embankments Exposed to Earthquake-Induced Liquefaction

“…Since soil structure interaction is very complex in the case of soil liquefaction, different failure mechanisms of an embankment can occur, such as slipping of the slope surface, piping failure, crest settlements, lateral spreading, etc. [9][10][11]. Consequently, various engineering demand parameters (EDPs) have been used for the derivation of fragility curves.…”