Seismic isolation of surface foundations exploiting the properties of natural liquefiable soil

Karatzia, Xenia; Mylonakis, George; Bouckovalas, George D.

doi:10.1016/j.soildyn.2019.03.009

Cited by 9 publications

(2 citation statements)

References 42 publications

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“…Karamitros [23]. By utilizing the characteristics of natural liquefied soil, Xenia Karatzia [24] isolated seismic protection structures and reduced the seismic impact on superstructures by partially repairing the surface soil, which then acted as a natural base isolation system. Araz Hasheminezhad [25] analyzed the seismic response of shallow foundations on liquefied soil which had been improved by deep soil mixing (DSM) via numerical simulations.…”

Section: Introductionmentioning

confidence: 99%

Study on the Influence of Deep Soil Liquefaction on the Seismic Response of Subway Stations

Shi,

Tao,

Wang

2024

Applied Sciences

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Subway systems are a crucial component of urban public transportation, especially in terms of safety during seismic events. Soil liquefaction triggered by earthquakes is one of the key factors that can lead to underground structural damage. This study investigates the impact of deep soil liquefaction on the response of subway station structures during seismic activity, aiming to provide evidence and suggestions for earthquake-resistant measures in underground constructions. The advanced finite element software PLAXIS was utilized for dynamic numerical simulations. Non-linear dynamic analysis methods were employed to construct models of subway stations and the surrounding soil layers, including soil–structure interactions. The UBC3D-PLM liquefaction constitutive model was applied to describe the liquefaction behavior of soil layers, while the HS constitutive model was used to depict the dynamic characteristics of non-liquefied soil layers. The study examined the influence of deep soil liquefaction on the dynamic response of subway station structures under different seismic waves. The findings indicate that deep soil liquefaction significantly increases the vertical displacement and acceleration responses of subway stations compared to non-liquefied conditions. The liquefaction behavior of deep soil layers leads to increased horizontal effective stress on both sides of the structure, thereby increasing the horizontal deformation of the structure and posing a potential threat to the safety and functionality of subway stations. This research employed detailed numerical simulation methods, incorporating the non-linear characteristics of deep soil layer liquefaction, providing an analytical framework based on regulatory standards for evaluating the impact of deep soil liquefaction on the seismic responses of subway stations. Compared to traditional studies, this paper significantly enhances simulation precision and practical applicability. Results from this research indicate that deep soil layer liquefaction poses a non-negligible risk to the structural safety of subway stations during earthquakes. Therefore, the issue of deep soil liquefaction should receive increased attention in engineering design and construction, with effective prevention and mitigation measures being implemented.

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Section: Introductionmentioning

confidence: 99%

Study on the Influence of Deep Soil Liquefaction on the Seismic Response of Subway Stations

Shi,

Tao,

Wang

2024

Applied Sciences

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“…Vulnerability assessments of buildings on shallow foundations in liquefiable soils have been mainly focused on soil deformation and the consequent damage to foundations. Since soil softening associated with liquefaction acts as a natural isolation barrier (Karatzia et al 2019), the damage associated with strong ground shaking, in conjunction with ground deformation, is often neglected. However, several studies (Dashti et al 2010;Kramer et al 2011) have demonstrated that when liquefaction occurs later in the strong shaking, buildings can experience both significant settlement and strong shaking.…”

Section: Introductionmentioning

confidence: 99%

Macromechanism Approach for Vulnerability Assessment of Buildings on Shallow Foundations in Liquefied Soils

Fonseca

Millen

Quintero

et al. 2023

J. Geotech. Geoenviron. Eng.

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The damage caused by seismic shaking and liquefaction-induced permanent ground deformation has conventionally been assessed as two separate problems often by different engineers. However, the two problems are inherently linked, since ground shaking causes liquefaction, and liquefaction-induced soil softening affects ground shaking. Modelling both problems within a single numerical model is complex for both the engineer and the software, and most finite element software only have the capabilities to address one of them. To improve the estimates of the seismic performance of buildings on liquefiable soil, a new sub-structuring approach is proposed called the macro-mechanism approach. This approach allows the soil-liquefaction-foundation-structure interaction to be considered in a series of sub-models accounting for the major nonlinear mechanisms of the system at a macro level. The proposed approach was implemented in the open-source finite element software OpenSees and then applied to a case study of a building where significant liquefaction-and shaking-induced damage was observed after the 1999 Mw 7.4 Kocaeli Earthquake. The case study building was also simulated using two different commercial software programs, the finite difference software FLAC, and the finite element software PLAXIS, by two different research teams. A comparison between the results from the macromechanism approach compared to full numerical models shows that the macro-mechanism approach can capture the extent of the foundation deformation and provide more realistic estimates of the building damage than full approaches since the FLAC and PLAXIS models consider elastic elements for the building.

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Numerical analysis of liquefaction-induced differential settlement of shallow foundations on an island slope

Cong

Tang

Ling

et al. 2021

Soil Dynamics and Earthquake Engineering

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Seismic isolation of surface foundations exploiting the properties of natural liquefiable soil

Cited by 9 publications

References 42 publications

Study on the Influence of Deep Soil Liquefaction on the Seismic Response of Subway Stations

Study on the Influence of Deep Soil Liquefaction on the Seismic Response of Subway Stations

Macromechanism Approach for Vulnerability Assessment of Buildings on Shallow Foundations in Liquefied Soils

Numerical analysis of liquefaction-induced differential settlement of shallow foundations on an island slope

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