Seismic Soil-Structure Interaction of Cross Sections of Flexible Underground Structures Subjected to Soil Liquefaction

Tamari, Yukio; Towhata, Ikuo

doi:10.3208/sandf.43.2_69

Cited by 30 publications

(9 citation statements)

References 11 publications

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“…Iwatate et al (2000) launched shaking table tests to investigate the failure mechanism of subway structures in the 1995 Kobe earthquake. Tamari and Towhata (2003) conducted a series of shaking table tests on a flexible rectangular cross-section structure in liquefiable ground. Ohtomo et al (2001Ohtomo et al ( , 2003 carried out shaking table tests on a large tunnel model (3.0 m × 1.75 m × 0.97 m, scale ratio 1/3-1/4) to investigate the soil-structure-interaction (SSI) based on the assumption of a two-dimensional plane strain model.…”

Section: Introductionmentioning

confidence: 99%

Shaking table tests on a three-arch type subway station structure in a liquefiable soil

Chen

et al. 2014

Bull Earthquake Eng

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A series of large-scale shaking table tests were performed to investigate the damage mechanisms of a three-arch type subway station structure in a liquefiable soil experiencing strong motions. Methods to measure the displacement included the vision-based displacement test and the fiber Bragg grating test to measure the strain of the galvanized steel wire. Sand boils, waterspouts, ground surface cracks and settlements, and buoyancy movement of the model structure were observed. When the peak excess pore pressure ratios dramatically increased, the Arias intensity also dramatically increased. The peak acceleration of the model soil also almost coincided with liquefaction of the model soil. The seismic responses of the model structure and the soil were shown to be more sensitive to input motions with larger low-frequency components, the phenomenon of high frequency filtering and low frequency amplification effect of the liquefied soil were observed. The peak tensile strain located at the top and bottom of the center pillars was larger than that obtained at the subarch, while the peak tensile strain at the atrium arch was the smallest. The peak strain at the primary and secondary observation sections were remarkably affected by the spatial effect. The results can provide valuable insight into the seismic investigation of these subway structures.

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Section: Introductionmentioning

confidence: 99%

Shaking table tests on a three-arch type subway station structure in a liquefiable soil

Chen

et al. 2014

Bull Earthquake Eng

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“…Koseki et al (1997a and1997b) investigated dynamic behaviors of several types of underground structures in liquefiable sand subjected to earthquake excitations. Tamari and Towhata (2003) performed a series of shaking table tests on an aluminum fixed base structure model embedded in liquefiable soil to propose a solution for determining dynamic soil pressures on a flexible underground structure during liquefaction. In most of these researches, main focus has been addressed to nonlinear behaviors of soil foundation where a simple linear response of built-in structures was assumed.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Seismic Response and Damage of Reinforced Concrete Ducts in Liquefiable Soils

Okhovat

Feng

Maekawa

2009

ACT

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Highly inelastic nonlinear interaction of liquefied soil and underground RC ducts is computationally investigated in view of the structural damage. The required ductility is expected to be insensitive to the risk of liquefaction for normally deposited layers of soil, and the lesser ductility is acceptable for the case of highly liquefiable foundation similar to the seismic isolation. Although the structural nonlinearity has a fewer effect on the uplift of the underground ducts, the amount of main reinforcement may control the structural damage with the same efficiency for both drained and undrained soil deposits.

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“…The eŠect of excess pore water is signiˆcant, and may be larger than the eŠective stress acting on the pile (Tokimatsu and Suzuki, 2004) and dependent on the seepage condition . Studies in this category of soil-structure interactions include case histories of pile damage (Tokimatsu and Asaka, 1998) and underground structures (Iida et al, 1996) as well as model tests on embedded footing (Tamura et al, 2007) and ‰exible underground structures (Tamari and Towhata, 2003).…”

Section: Geotechnical Structures With Saturated Soilmentioning

confidence: 99%

Soils and Foundations During Earthquakes

Iai

Ichii

2010

Soils and Foundations

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This paper provides an overview of the modern understanding of the behavior of soils and foundations during an earthquake based on the papers published in Soils and Foundations over the lastˆfty years. The most fundamental issues in geotechnical earthquake engineering are the non-linearity of soil under cyclic loading and its implications on the seismic performance of geotechnical structures. The non-linearity of granular materials is essentially anisotropic, whereas the linear or equivalent linear model often used in conventional practices is isotropic. The non-linearity of dry soil is characterized by the diŠerence between the peak and residual strengths, and the increased awareness of the implications of this diŠerence over time has allowed for the development of a generalized methodology for evaluating active earth pressures. The non-linearity of saturated soil under undrained cyclic shear diŠers fundamentally from that of dry soil, with saturated soil capable of mobilizing 100z of the shear strain in the double amplitude. The cyclic behavior of saturated soil under initial shear is typical of most seismic behaviors of geotechnical structures, including embankments, caisson quay walls, and underground structures. The liquefaction-induced ‰ow failure of geotechnical structures is associated with the steady state of sand in the order of 10 kPa. However, the challenge in the coming decades will be to evaluate the combined eŠects due to cyclic loading and the steady state. Moreover, the eŠects of pore water migration are signiˆcant in the case of highly permeable geotechnical materials when evaluating settlement of the ground or addressing inter-layered structures of clay and sand. Although current research is elucidating the mechanics of partially saturated sands, the new challenge is to understand combined hazards, such as a combination of earthquake motions and tsunamis. Thus, new approaches and technologies need to be developed.

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Seismic Soil-Structure Interaction of Cross Sections of Flexible Underground Structures Subjected to Soil Liquefaction

Cited by 30 publications

References 11 publications

Shaking table tests on a three-arch type subway station structure in a liquefiable soil

Shaking table tests on a three-arch type subway station structure in a liquefiable soil

Nonlinear Seismic Response and Damage of Reinforced Concrete Ducts in Liquefiable Soils

Soils and Foundations During Earthquakes

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