A cyclic viscoelastic–viscoplastic constitutive model for clay and liquefaction analysis of multi‐layered ground
Identifieur interne : 002621 ( Istex/Corpus ); précédent : 002620; suivant : 002622A cyclic viscoelastic–viscoplastic constitutive model for clay and liquefaction analysis of multi‐layered ground
Auteurs : Fusao Oka ; Takeshi Kodaka ; Yong Eong KimSource :
- International Journal for Numerical and Analytical Methods in Geomechanics [ 0363-9061 ] ; 2004-02.
English descriptors
- KwdEn :
Abstract
In order to estimate viscous effect of clay in the wide range of low to high level of strain, a cyclic viscoelastic–viscoplastic constitutive model for clay is proposed. First, we confirm the performance of the proposed model by simulating the cyclic undrained triaxial tests to determine the cyclic strength and deformation characteristics of a natural marine clay. Then, the proposed model is incorporated into an effective stress based liquefaction analysis method to estimate the effect of an intermediate clay layer on the behaviour of liquefiable sand layers. The seismic response against foreshocks, main shock as well as aftershocks of 1995 Hyogoken Nambu Earthquake is analysed in the present study. The difference of shear strength characteristics of the alluvial clay layer is one of the reasons why Port Island has a higher liquefaction potential than that of Rokko Island. The proposed model gives a good description of the damping characteristics of clay layer during large earthquakes. Acceleration responses in both clay layer and liquefiable sand layer just above it are damped due to viscous effect of clay. In the case of main shock and the following aftershocks that occurred within less than 9 days after main event, acceleration responses near ground surface are de‐amplified due to the developed excess pore water pressure, while responses near ground surface are amplified before and long after the main event. Using the viscoelastic–viscoplastic model for clay layer, time history of acceleration response in upper liquefiable sand layer can be well calculated, in particular in the range of microtremor process after the main seismic motion. Copyright © 2004 John Wiley & Sons, Ltd.
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DOI: 10.1002/nag.329
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First, we confirm the performance of the proposed model by simulating the cyclic undrained triaxial tests to determine the cyclic strength and deformation characteristics of a natural marine clay. Then, the proposed model is incorporated into an effective stress based liquefaction analysis method to estimate the effect of an intermediate clay layer on the behaviour of liquefiable sand layers. The seismic response against foreshocks, main shock as well as aftershocks of 1995 Hyogoken Nambu Earthquake is analysed in the present study. The difference of shear strength characteristics of the alluvial clay layer is one of the reasons why Port Island has a higher liquefaction potential than that of Rokko Island. The proposed model gives a good description of the damping characteristics of clay layer during large earthquakes. Acceleration responses in both clay layer and liquefiable sand layer just above it are damped due to viscous effect of clay. In the case of main shock and the following aftershocks that occurred within less than 9 days after main event, acceleration responses near ground surface are de‐amplified due to the developed excess pore water pressure, while responses near ground surface are amplified before and long after the main event. Using the viscoelastic–viscoplastic model for clay layer, time history of acceleration response in upper liquefiable sand layer can be well calculated, in particular in the range of microtremor process after the main seismic motion. Copyright © 2004 John Wiley & Sons, Ltd.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Fusao Oka</name><affiliations><json:string>Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Yoshida Hon‐machi, Sakyo‐ku, Kyoto 606‐8501, Japan</json:string></affiliations></json:item><json:item><name>Takeshi Kodaka</name><affiliations><json:string>Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Yoshida Hon‐machi, Sakyo‐ku, Kyoto 606‐8501, Japan</json:string></affiliations></json:item><json:item><name>Yong‐Seong Kim</name><affiliations><json:string>Dam Safety Research Team, Water Resources Research Institute, Yuseong‐gu, Daejeon, South Korea</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>viscoelastic</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>viscoplastic</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>constitutive model</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>clay</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>layered ground</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>liquefaction</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>finite element analysis</value></json:item></subject><articleId><json:string>NAG329</json:string></articleId><language><json:string>eng</json:string></language><abstract>In order to estimate viscous effect of clay in the wide range of low to high level of strain, a cyclic viscoelastic–viscoplastic constitutive model for clay is proposed. First, we confirm the performance of the proposed model by simulating the cyclic undrained triaxial tests to determine the cyclic strength and deformation characteristics of a natural marine clay. Then, the proposed model is incorporated into an effective stress based liquefaction analysis method to estimate the effect of an intermediate clay layer on the behaviour of liquefiable sand layers. The seismic response against foreshocks, main shock as well as aftershocks of 1995 Hyogoken Nambu Earthquake is analysed in the present study. The difference of shear strength characteristics of the alluvial clay layer is one of the reasons why Port Island has a higher liquefaction potential than that of Rokko Island. The proposed model gives a good description of the damping characteristics of clay layer during large earthquakes. Acceleration responses in both clay layer and liquefiable sand layer just above it are damped due to viscous effect of clay. In the case of main shock and the following aftershocks that occurred within less than 9 days after main event, acceleration responses near ground surface are de‐amplified due to the developed excess pore water pressure, while responses near ground surface are amplified before and long after the main event. Using the viscoelastic–viscoplastic model for clay layer, time history of acceleration response in upper liquefiable sand layer can be well calculated, in particular in the range of microtremor process after the main seismic motion. 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In the case of main shock and the following aftershocks that occurred within less than 9 days after main event, acceleration responses near ground surface are de‐amplified due to the developed excess pore water pressure, while responses near ground surface are amplified before and long after the main event. Using the viscoelastic–viscoplastic model for clay layer, time history of acceleration response in upper liquefiable sand layer can be well calculated, in particular in the range of microtremor process after the main seismic motion. 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First, we confirm the performance of the proposed model by simulating the cyclic undrained triaxial tests to determine the cyclic strength and deformation characteristics of a natural marine clay. Then, the proposed model is incorporated into an effective stress based liquefaction analysis method to estimate the effect of an intermediate clay layer on the behaviour of liquefiable sand layers.</p><p>The seismic response against foreshocks, main shock as well as aftershocks of 1995 Hyogoken Nambu Earthquake is analysed in the present study. The difference of shear strength characteristics of the alluvial clay layer is one of the reasons why Port Island has a higher liquefaction potential than that of Rokko Island. The proposed model gives a good description of the damping characteristics of clay layer during large earthquakes. Acceleration responses in both clay layer and liquefiable sand layer just above it are damped due to viscous effect of clay. In the case of main shock and the following aftershocks that occurred within less than 9 days after main event, acceleration responses near ground surface are de‐amplified due to the developed excess pore water pressure, while responses near ground surface are amplified before and long after the main event. Using the viscoelastic–viscoplastic model for clay layer, time history of acceleration response in upper liquefiable sand layer can be well calculated, in particular in the range of microtremor process after the main seismic motion. Copyright © 2004 John Wiley & Sons, Ltd.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>A cyclic viscoelastic–viscoplastic constitutive model for clay and liquefaction analysis of multi‐layered ground</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>A CYCLIC VISCOELASTIC–VISCOPLASTIC MODEL FOR CLAY</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>A cyclic viscoelastic–viscoplastic constitutive model for clay and liquefaction analysis of multi‐layered ground</title></titleInfo><name type="personal"><namePart type="given">Fusao</namePart><namePart type="family">Oka</namePart><affiliation>Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Yoshida Hon‐machi, Sakyo‐ku, Kyoto 606‐8501, Japan</affiliation><description>Correspondence: Department of Civil and Earth Resources Engineering, Kyoto University, Yoshida Hon‐machi, Sakyo‐ku, Kyoto 606‐8501, Japan</description><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Takeshi</namePart><namePart type="family">Kodaka</namePart><affiliation>Department of Civil and Earth Resources Engineering, Graduate School of Engineering, Kyoto University, Yoshida Hon‐machi, Sakyo‐ku, Kyoto 606‐8501, Japan</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Yong‐Seong</namePart><namePart type="family">Kim</namePart><affiliation>Dam Safety Research Team, Water Resources Research Institute, Yuseong‐gu, Daejeon, South Korea</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>John Wiley & Sons, Ltd.</publisher><place><placeTerm type="text">Chichester, UK</placeTerm></place><dateIssued encoding="w3cdtf">2004-02</dateIssued><dateCaptured encoding="w3cdtf">2003-03-14</dateCaptured><dateValid encoding="w3cdtf">2003-09-08</dateValid><copyrightDate encoding="w3cdtf">2004</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">35</extent><extent unit="tables">9</extent><extent unit="references">26</extent></physicalDescription><abstract lang="en">In order to estimate viscous effect of clay in the wide range of low to high level of strain, a cyclic viscoelastic–viscoplastic constitutive model for clay is proposed. First, we confirm the performance of the proposed model by simulating the cyclic undrained triaxial tests to determine the cyclic strength and deformation characteristics of a natural marine clay. Then, the proposed model is incorporated into an effective stress based liquefaction analysis method to estimate the effect of an intermediate clay layer on the behaviour of liquefiable sand layers. The seismic response against foreshocks, main shock as well as aftershocks of 1995 Hyogoken Nambu Earthquake is analysed in the present study. The difference of shear strength characteristics of the alluvial clay layer is one of the reasons why Port Island has a higher liquefaction potential than that of Rokko Island. The proposed model gives a good description of the damping characteristics of clay layer during large earthquakes. Acceleration responses in both clay layer and liquefiable sand layer just above it are damped due to viscous effect of clay. In the case of main shock and the following aftershocks that occurred within less than 9 days after main event, acceleration responses near ground surface are de‐amplified due to the developed excess pore water pressure, while responses near ground surface are amplified before and long after the main event. Using the viscoelastic–viscoplastic model for clay layer, time history of acceleration response in upper liquefiable sand layer can be well calculated, in particular in the range of microtremor process after the main seismic motion. Copyright © 2004 John Wiley & Sons, Ltd.</abstract><subject lang="en"><genre>keywords</genre><topic>viscoelastic</topic><topic>viscoplastic</topic><topic>constitutive model</topic><topic>clay</topic><topic>layered ground</topic><topic>liquefaction</topic><topic>finite element analysis</topic></subject><relatedItem type="host"><titleInfo><title>International Journal for Numerical and Analytical Methods in Geomechanics</title></titleInfo><titleInfo type="abbreviated"><title>Int. J. Numer. Anal. Meth. Geomech.</title></titleInfo><genre type="journal">journal</genre><subject><genre>article-category</genre><topic>Research Article</topic></subject><identifier type="ISSN">0363-9061</identifier><identifier type="eISSN">1096-9853</identifier><identifier type="DOI">10.1002/(ISSN)1096-9853</identifier><identifier type="PublisherID">NAG</identifier><part><date>2004</date><detail type="volume"><caption>vol.</caption><number>28</number></detail><detail type="issue"><caption>no.</caption><number>2</number></detail><extent unit="pages"><start>131</start><end>179</end><total>49</total></extent></part></relatedItem><relatedItem type="preceding"><titleInfo><title>Mechanics of Cohesive‐frictional Materials</title></titleInfo><identifier type="ISSN">1082-5010</identifier><identifier type="ISSN">1099-1484</identifier><part><date point="end">2000</date><detail type="volume"><caption>last vol.</caption><number>5</number></detail><detail type="issue"><caption>last no.</caption><number>8</number></detail></part></relatedItem><identifier type="istex">A544547AE3E1EF8352277FB7FF05F6C190099B45</identifier><identifier type="DOI">10.1002/nag.329</identifier><identifier type="ArticleID">NAG329</identifier><accessCondition type="use and reproduction" contentType="copyright">Copyright © 2004 John Wiley & Sons, Ltd.</accessCondition><recordInfo><recordContentSource>WILEY</recordContentSource><recordOrigin>John Wiley & Sons, Ltd.</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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