The importance of vertical accelerations in liquefied soils

Hughes, FE; Madabhushi, Spg

doi:10.1201/9780429438646-31

Cited by 7 publications

(2 citation statements)

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“…In fact, the cyclic components rise slightly above this, indicating that there is a net vertical acceleration of the soil body during the earthquake loading. Similar observations were made by Hughes and Madabhushi (2018) with respect to basement structures in liquefied soils. In contrast, the excess pore pressures below the structure are much higher at comparative depths.…”

Section: Excess Pore Water Pressures In the Foundation Soilsupporting

confidence: 85%

Modelling the behaviour of large gravity wharf structure under the effects of earthquake-induced liquefaction

Madabhushi

Boksmati

Torres

2019

Coastal Engineering

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Gravity Wharf Structures are widely used worldwide to form shallow and deep water ports. They are large structures with a height of 25~50 m depending on the water depth. When these structures are to be sited on loose to medium dense sand, earthquake induced liquefaction settlements present a significant risk. This often requires expensive soil replacement or other ground improvement techniques. In this paper, the dynamic behaviour of these large structures that exert very high bearing pressures on the foundation soil was investigated for the first time. The level of settlements they can suffer due to soil liquefaction was investigated using dynamic centrifuge testing. It will be shown that the full liquefaction does not occur below the structure even when the free field soil fully liquefies during strong earthquakes. However there will be some stiffness degradation owing to excess pore pressure generation and consequent structural settlements. The level of these settlements are considered to be acceptable from a Service Limit State (SLS) perspective. In addition to this the hydro-dynamic pressures that act on the Gravity Wharf structure were also investigated.

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Section: Excess Pore Water Pressures In the Foundation Soilsupporting

confidence: 85%

Modelling the behaviour of large gravity wharf structure under the effects of earthquake-induced liquefaction

Madabhushi

Boksmati

Torres

2019

Coastal Engineering

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“…Dynamic centrifuge tests employing Duxseal or other energy-absorbing materials along their boundaries mainly consist of two categories: earthquake induced events with relatively large ground movement amplitudes and ground-borne vibration problems with small amplitude ground movements. The majority of these studies focus on the former category and relate to free-field ground motions (Pak et al 2011;Soudkhah and Pak 2012;Zhu et al 2018), retaining wall behavior (Dewoolkar et al 2001;Madabhushi and Haigh 2019;Madabhushi and Haigh 2021), shallow foundations (Chakrabortty and Popescu 2012;Heron et al 2015;Adamidis and Madabhushi 2018;Kassas et al 2020;Kassas et al 2021;Adamidis and Madabhushi 2021), basement structures sited on liquefiable soil (Hughes and Madabhushi 2018), and underground structures (Cilingir and Madabhushi 2011;Chian and Madabhushi 2013;Chian et al 2014). The latter category has mainly related to railway induced ground-borne vibrations and soilstructure interactions, including vibrations from surface (Yang et al 2013b) and underground railways (Yang et al 2013a).…”

Section: Introductionmentioning

confidence: 99%

Effect of Duxseal on Horizontal Stress and Soil Stiffness in Small-Amplitude Dynamic Centrifuge Models

Cui

Heron

Marshall

2022

Geotechnical Testing Journal

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The constitutive behavior of soil is stress dependent. Therefore, geotechnical centrifuges are widely used to replicate full-scale stress fields, thereby ensuring the correct soil response within reduced-scale centrifuge models. A vibration absorbing material (such as Duxseal) is commonly employed to reduce the effect of reflected waves generated at the boundaries of rigid containers in dynamic centrifuge tests.However, such a material has the potential to deform laterally under the high horizontal stresses applied within centrifuge tests and consequently the initial at rest lateral earth pressure condition will not be maintained. A procedure to back-calculate the lateral earth pressure coefficient (𝐾) is presented in this paper.In addition, two experimental methods, which are implemented to evaluate 𝐾 by measuring the shear wave velocity from centrifuge-based air hammer testing and triaxial based bender element testing, are described.Results demonstrate that significant lateral earth pressure and soil stiffness reductions are observed within the upper soil region (top third of the model depth). In addition, the appropriate manipulation of the crosscorrelation method used to process shear wave signals is discussed and an empirical equation to predict the small strain shear modulus of the dry silica sand (HST95 Congleton sand) used in this study is provided.Outcomes of this study are directly applicable to small-amplitude dynamic centrifuge tests such as groundborne vibrations; some factors relating to large-amplitude seismic studies, such as soil inertial effects and

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Centrifuge Modeling of Soil Liquefaction Triggering: 2017 Pohang Earthquake

Choi,

Kwon,

2024

KSCE J Civ Eng

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The importance of vertical accelerations in liquefied soils

Cited by 7 publications

References 1 publication

Modelling the behaviour of large gravity wharf structure under the effects of earthquake-induced liquefaction

Modelling the behaviour of large gravity wharf structure under the effects of earthquake-induced liquefaction

Effect of Duxseal on Horizontal Stress and Soil Stiffness in Small-Amplitude Dynamic Centrifuge Models

Centrifuge Modeling of Soil Liquefaction Triggering: 2017 Pohang Earthquake

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