Analysis of Undrained Cyclic Behavior of Sand under Anisotropic Consolidation

Iai, Susumu; Matsunaga, Yasuo; Kameoka, Tomohiro

doi:10.3208/sandf1972.32.2_16

Cited by 54 publications

(42 citation statements)

References 2 publications

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“…The first model is a multi-spring element model, as presented in Figure 3(a), with the hyperbolic non-linear model defined in strain space, which considers the rotation of the principle stress axis direction. This effect plays a role in the cyclic behavior of anisotropy-consolidated sand [15]. The multispring element model is generated with the shearing section in a direction in which the hyperbola model works.…”

Section: Figurementioning

confidence: 99%

Liquefaction Potential Analysis Along Coastal Area of Bengkulu Province due to the 2007 Mw 8.6 Bengkulu Earthquake

Mase

2017

J. Eng. Technol. Sci.

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Abstract. This paper presents a seismic response analysis study of liquefiable sites along the northern parts of the coastal area of Bengkulu Province that underwent liquefaction phenomena during the strong earthquake (8.6 M w ) on 12 September 2007. Several investigation tests, including the standard penetration test (SPT) and the soil shear wave velocity test, were conducted at 8 locations. The data were used to simulate the seismic response in order to investigate soil behaviors during the earthquake. In addition, the excess pore water pressure ratio obtained from the analysis was compared with the prediction value calculated from empirical data. The results show that liquefaction can occur at shallow depth layers dominated by loose sand. The results also confirm field evidence collected during the earthquake that was reported in several previous studies. The excess pore water pressure ratio was in good agreement with the predicted value from the empirical approach.

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Section: Figurementioning

confidence: 99%

Liquefaction Potential Analysis Along Coastal Area of Bengkulu Province due to the 2007 Mw 8.6 Bengkulu Earthquake

Mase

2017

J. Eng. Technol. Sci.

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“…Among the various continuum-constitutive models proposed for granular materials, a strain space multiple mechanism model is one of the promising examples for describing their specific structure. [24][25][26][27][28] The model consists of a multitude of simple shear mechanisms, each oriented in an arbitrary direction. These mechanisms can idealize the internal (or micromechanical) structure of granular materials with an induced fabric anisotropy, as well as the evolution of this structure under monotonic and cyclic loadings and complicated loading paths, including the effect of rotation of the principal stress axes.…”

Section: Introductionmentioning

confidence: 99%

Constitutive modeling of inherent anisotropy in a strain space multiple mechanism model for granular materials

Ueda

Iai

2018

Num Anal Meth Geomechanics

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Summary Consideration of fabric anisotropy is crucial to gaining an improved understanding of the behavior of granular materials. This paper presents a constitutive model to describe the sand behavior associated with fabric anisotropy within a framework of a strain space multiple mechanism model. In the proposed model, a second‐order fabric tensor is extended by incorporating a new function that represents the effect of inherent (or initial fabric) anisotropy, along with three additional parameters: two of them, a1 and a2, control the degree of anisotropy, and the second mode of inherent anisotropy can be expressed by introducing the parameter a2 as well as the first mode by the parameter a1. The third parameter, θ0, expresses the principal direction of inherent anisotropy (eg, the normal vector direction of bedding planes relative to horizontal axis). The formulation of the dilative component of dilatancy (ie, positive dilatancy) is also extended to consider the effect of inherent anisotropy based on the interlocking mechanism. Experimental data on the complex anisotropic responses of Fraser River sand and Toyoura sand under monotonic loading is used to validate this model. The proposed model is shown to successfully capture anisotropic responses, which become contractive or dilative depending on different principal‐stress directions, with a single set of anisotropy parameters; thus, the model is considered to possess the capability to simulate the anisotropic behaviors of granular materials. In addition to different loadings on the same fabric, the effects of different fabric anisotropies upon the sand behavior under the same loadings are also investigated.

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“…This model can simulate the behavior of sand subjected to the rotation of principal stress axes, which plays an important role in the behavior of initially anisotropically consolidated sand under cyclic simple shear (Iai et al, 1992b). With the effective stress and strain vectors written as: (1) ( 2) the basic form of the constitutive relation is given by (3) where (4) In this relation, the term {d8p} in Eq.…”

Section: Constitutive Modelmentioning

confidence: 99%

Effective Stress Analyses of Port Structures

Iai

Ichii

Liu

et al. 1998

SOILS AND FOUNDATIONS

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Effective stress analyses are performed on the seismic response of port structures during the 1995 Hyogoken-Nambu earthquake. The structures analyzed include: caisson type quay walls which moved up to 5 m maximum toward the sea; pneumatic caisson type bridge foundations which moved toward the sea, reducing the distance between the bridge foundations across a sea channel by a total of 0.8 m; and composite breakwaters which settled 2 m. Although these structures were all a rigid concrete type and shaken by the same earthquake, the mode and extent of deformation/ failure were different depending on the backfill and embedment conditions of the structures.The constitutive model of soil used for the seismic analyses is a multiple mechanism model defined in strain space. The model can take the effect of principal stress axis rotation into account, which is known to play an important role in the cyclic behavior of sand under anisotropic stress conditions. The model parameters are calibrated based on insitu and laboratory investigations, including in-situ freeze sampling. The results of the effective stress analyses are consistent with those measured, including the mode and extent of deformation/ failure, suggesting that the cyclic behavior of soil, idealized through the effective stress model, can explain the variety of seismic response of the port structures in a unified manner.

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Analysis of Undrained Cyclic Behavior of Sand under Anisotropic Consolidation

Cited by 54 publications

References 2 publications

Liquefaction Potential Analysis Along Coastal Area of Bengkulu Province due to the 2007 Mw 8.6 Bengkulu Earthquake

Liquefaction Potential Analysis Along Coastal Area of Bengkulu Province due to the 2007 Mw 8.6 Bengkulu Earthquake

Constitutive modeling of inherent anisotropy in a strain space multiple mechanism model for granular materials

Effective Stress Analyses of Port Structures

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