Numerical Analysis of Seismic Behavior of Embankments Founded on Liquefiable Soils

Matsuo, Osamu; Shimazu, Takao; Uzuoka, Ryosuke; Mihara, Masaya; Nishi, Kunio

doi:10.3208/sandf.40.2_21

Cited by 40 publications

(7 citation statements)

References 9 publications

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“…Typical results of measured (Matsuo et al, 2000) and computed stress-strain and stress path are shown in Figure 13.3 (Ozutsumi, 2003). For undrained cyclic loading tests of soil with lateral normal strain constrained, usually called liquefaction tests, primary focus of the strain components is directed on shear strain amplitude.…”

Section: Cyclic Deformation Of Soil Under Initial Deviator Stressmentioning

confidence: 99%

Earthquake Geotechnical Engineering

Bojorque

Roeck

Maertens

2007

Geotechnical, Geological and Earthquake Engineering

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Section: Cyclic Deformation Of Soil Under Initial Deviator Stressmentioning

confidence: 99%

Earthquake Geotechnical Engineering

Bojorque

Roeck

Maertens

2007

Geotechnical, Geological and Earthquake Engineering

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“…Performance of the model for cyclic loading under undrained condition is studied without considering the effect of steady state. In this simulation, laboratory test results by Matsuo et al 47 are used as a reference for the simulation. The soil element is at first isotropically consolidated with a confining pressure of p 0 = 65.3 kPa, and then is subject to a cyclic simple shear with an amplitude of τ xy = 14 kPa, that corresponds to the stress ratio of τ xy / p 0 = 0.21, for 15 cycles.…”

Section: Simulation Of Steady State and Cyclic Mobilitymentioning

confidence: 99%

“… Cyclic undrained behavior (measured data after Matsuo et al 47): stress–strain relationship (measured (a), computed (b)) and stress path (measured (c), computed (d)). …”

Section: Simulation Of Steady State and Cyclic Mobilitymentioning

confidence: 99%

Dilatancy of granular materials in a strain space multiple mechanism model

Iai

Tobita

Ozutsumi³

et al. 2011

Num Anal Meth Geomechanics

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SUMMARYA granular material consists of an assemblage of particles with contacts newly formed or disappeared, changing the micromechanical structures during macroscopic deformation. These structures are idealized through a strain space multiple mechanism model as a twofold structure consisting of a multitude of virtual two-dimensional mechanisms, each of which consists of a multitude of virtual simple shear mechanisms of one-dimensional nature. In particular, a second-order fabric tensor describes direct macroscopic stressstrain relationship, and a fourth-order fabric tensor describes incremental relationship. In this framework of modeling, the mechanism of interlocking defined as the energy less component of macroscopic strain provides an appropriate bridge between micromechanical and macroscopic dilative component of dilatancy. Another bridge for contractive component of dilatancy is provided through an obvious hypothesis on micromechanical counterparts being associated with virtual simple shear strain. It is also postulated that the dilatancy along the stress path beyond a line slightly above the phase transformation line is only due to the mechanism of interlocking and increment in dilatancy due to this interlocking eventually vanishing for a large shear strain. These classic postulates form the basis for formulating the dilatancy in the strain space multiple mechanism model. The performance of the proposed model is demonstrated through simulation of undrained behavior of sand under monotonic and cyclic loading.

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“…However, recent experiences in the analysis of one particular type of river dike, river dike No. 1 of the Shiribeshi-Toshibeshi river, Hokkaido, Japan, during the 1993 Hokkaido-Nanseioki earthquake with a Richter magnitude of 7.8, poses a new challenge (Matsuo et al, 2000). This river dike, which was constructed on loosely deposited sand with a thick- (Fig.…”

Section: Liquefaction-induced Flow Failurementioning

confidence: 99%

“…13(a)-(d). To validate the engineering methodology, a complete set of data on the undrained cyclic behavior of soil elements, input earthquake motions, and the behaviors of embankments is required (Kuwano and Ishihara, 1988;Matsuo et al, 2000).…”

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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Numerical Analysis of Seismic Behavior of Embankments Founded on Liquefiable Soils

Cited by 40 publications

References 9 publications

Earthquake Geotechnical Engineering

Earthquake Geotechnical Engineering

Dilatancy of granular materials in a strain space multiple mechanism model

Soils and Foundations During Earthquakes

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