Study on the pore water pressure dissipation method as a liquefaction countermeasure using soil–water coupled finite deformation analysis equipped with a macro-element method

Noda, Toshihiro; Yamada, Shotaro; Nonaka, T.; Tashiro, Mutsumi

doi:10.1016/j.sandf.2015.09.013

Cited by 9 publications

(3 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, in addition to knowing whether this technique would be effective or not in preventing liquefaction, prediction of the amount of settlement that would occur when liquefaction is inhibited is also an important point. Noda et al 29) analyzed the principle of this technique by incorporating the Fig.14 Distributions of the degree of saturation after the earthquake, showing the rise in water level 25) . .…”

Section: Ground Improvement Ground Reinforcement Methodolo-gies Andmentioning

confidence: 99%

NEW DEVELOPMENTS RELATED TO CLARIFICATION OF THE MECHANISMS OF GROUND DEFORMATION CAUSED BY EARTHQUAKES —IN THE WAKE OF THE GREAT EAST JAPAN EARTHQUAKE—

2017

Self Cite

View full text Add to dashboard Cite

The 2011 Great East Japan Earthquake caused massive ground damage, including liquefaction of sandy grounds, collapse of river levees and lands developed for housing, etc., particularly in regions across eastern Japan. Not only damage to "currently unqualified" structures that did not conform to existing design standards and codes but also ground damage that could not be explained within the framework of conventional geomechanics and geotechnical engineering was observed. Particularly in the latter case, therefore, it has become necessary to develop new techniques in geomechanics without being restrained by the conventional framework. From the above standpoint, this paper reviews the research that has been carried out in the field of geotechnology after the Great East Japan Earthquake. More specifically, new knowledge relating to the mechanism of liquefaction damage at Urayasu City and other ground deformation caused by the earthquake is introduced, together with the results of research carried out on ground strengthening techniques.

show abstract

Section: Ground Improvement Ground Reinforcement Methodolo-gies Andmentioning

confidence: 99%

NEW DEVELOPMENTS RELATED TO CLARIFICATION OF THE MECHANISMS OF GROUND DEFORMATION CAUSED BY EARTHQUAKES —IN THE WAKE OF THE GREAT EAST JAPAN EARTHQUAKE—

2017

Self Cite

View full text Add to dashboard Cite

show abstract

“…The SYS Cam-clay model (Asaoka et al, 2002) was used as a constitutive model of the soil skeleton for al soil materials. For simplicity, it was assumed that the permeability coefficient k for each ground layer to be isotropic and logarithmically related to the void ratio e in the manner expressed in 0 0 e ln e   k k C k (7) where C k is the coefficient of permeability change. As shown in Table 1, C k , k 0 , and e 0 were determined based on the results of consolidation tests on undisturbed samples.…”

Section: Verification Of the Proposed Methods Based On Simulating An Amentioning

confidence: 99%

Evaluation of the improvement effects by vertical drains/vacuum consolidation on peaty ground under embankment loading

Tashiro

Nguyen

2016

JGS Special Publication

Self Cite

View full text Add to dashboard Cite

A new macro-element method with water absorption and discharge functions proposed by the authors was incorporated into a soil-water coupled finite deformation analysis code capable of accounting for inertial forces and verified by simulating an actual ground behavior observed in a peaty ground improved with vertical drains and vacuum consolidation. It was found that the proposed method was capable of simulating a range of ground behaviors including the temporal change in pore water pressure, horizontal displacement, and the settlement of the surrounding ground. Because a continuous middle sand layer was found to exist spanning the entire improved area at the actual site, additional simulations were performed to elucidate the effect of this layer. Furthermore, based on a series of simulations with a particular focus on the influence of drain spacing, it was revealed that although the vacuum consolidation method is effective in cases where it is necessary to limit deformation of the surrounding ground, the same reduction in residual settlement can be achieved using vertical drains alone, provided that the drains are deployed at a sufficient frequency.

show abstract

“…Further, the model can represent the behavior of sandy soils, and it can simulate the compaction of loose sand into dense sand during cyclic drained shear and the decrease in effective stress and loss of shear stiffness during cyclic undrained shear by describing changes in the skeleton structure (Asaoka et al 2002). Further, the model works robustly when introduced to soil-water-coupled finite-deformation analysis (Noda et al , 2015Tashiro et al 2015;Yamada et al 2015;Nonaka et al 2017a, b;Nguyen et al 2015). Recently, a model that covers even cement-improved soil has been proposed by adding cementation to the skeletal structure concept (Yamada et al 2022b).…”

Section: Three Loading Surfaces Composed Of the Sys Cam-clay Modelmentioning

confidence: 99%

Finite-Deformation Cam-Clay Model Considering Elastic Dilatancy and Soil Skeleton Structure

Yamada

Noda

2023

Int. J. Geomech.

Self Cite

View full text Add to dashboard Cite

Elastoplastic constitutive equations for soils often employ the nonlinear rate-type isotropic Hooke's law, which is based on the additive decomposition of strain rate and considers the pressure dependency in the elastic part. Hooke's law has independent isotropic and deviatoric components, and therefore, it cannot express elastic dilatancy as confirmed in experiments. In this model, although the elastic volume change is path-independent, the shear strain exhibits a significant residual when subjected to an effective stress cycle. This study proposes a rate-type elastic constitutive equation for soil applicable to elastoplastic constitutive equations based on finite deformation theory using an objective stress rate and additive decomposition of stretching; these equations cover these shortcomings of the rate-type Hooke's law. The proposed rate-type elasticity constitutive equation is based on the hyperelastic body in the infinitesimal deformation theory proposed by Einav and Puzrin or Houlsby et al. and has confining pressure dependence, path independence of elastic volume change, and elastic dilatancy. Further, the residual strain is considerably smaller than that of the rate-type Hooke's law. Moreover, this study improves the elastoplastic constitutive equation, SYS Cam-Clay model, based on the skeleton structure concept by introducing the proposed elastic constitutive equation. The basic behavior of the elastoplastic constitutive equation for clay and sand is demonstrated to show that the newly acquired elastic dilatancy improves the mean effective stress reduction behavior during shear stress unloading under undrained conditions and the stiffness recovery behavior during liquefaction, which is essential for describing cyclic mobility.

show abstract

Study on the pore water pressure dissipation method as a liquefaction countermeasure using soil–water coupled finite deformation analysis equipped with a macro-element method

Cited by 9 publications

References 7 publications

NEW DEVELOPMENTS RELATED TO CLARIFICATION OF THE MECHANISMS OF GROUND DEFORMATION CAUSED BY EARTHQUAKES —IN THE WAKE OF THE GREAT EAST JAPAN EARTHQUAKE—

NEW DEVELOPMENTS RELATED TO CLARIFICATION OF THE MECHANISMS OF GROUND DEFORMATION CAUSED BY EARTHQUAKES —IN THE WAKE OF THE GREAT EAST JAPAN EARTHQUAKE—

Evaluation of the improvement effects by vertical drains/vacuum consolidation on peaty ground under embankment loading

Finite-Deformation Cam-Clay Model Considering Elastic Dilatancy and Soil Skeleton Structure

Contact Info

Product

Resources

About

Study on the pore water pressure dissipation method as a liquefaction countermeasure using soil–water coupled finite deformation analysis equipped with a macro-element method

Cited by 9 publications

References 7 publications

NEW DEVELOPMENTS RELATED TO CLARIFICATION OF THE MECHANISMS OF GROUND DEFORMATION CAUSED BY EARTHQUAKES &mdash;IN THE WAKE OF THE GREAT EAST JAPAN EARTHQUAKE&mdash;

NEW DEVELOPMENTS RELATED TO CLARIFICATION OF THE MECHANISMS OF GROUND DEFORMATION CAUSED BY EARTHQUAKES &mdash;IN THE WAKE OF THE GREAT EAST JAPAN EARTHQUAKE&mdash;

Evaluation of the improvement effects by vertical drains/vacuum consolidation on peaty ground under embankment loading

Finite-Deformation Cam-Clay Model Considering Elastic Dilatancy and Soil Skeleton Structure

Contact Info

Product

Resources

About

NEW DEVELOPMENTS RELATED TO CLARIFICATION OF THE MECHANISMS OF GROUND DEFORMATION CAUSED BY EARTHQUAKES —IN THE WAKE OF THE GREAT EAST JAPAN EARTHQUAKE—

NEW DEVELOPMENTS RELATED TO CLARIFICATION OF THE MECHANISMS OF GROUND DEFORMATION CAUSED BY EARTHQUAKES —IN THE WAKE OF THE GREAT EAST JAPAN EARTHQUAKE—