Shear-displacement-amplitude dependent pore-pressure generation in undrained cyclic loading ring shear tests : An energy approach
Identifieur interne : 001374 ( Main/Exploration ); précédent : 001373; suivant : 001375Shear-displacement-amplitude dependent pore-pressure generation in undrained cyclic loading ring shear tests : An energy approach
Auteurs : Kyoji Sassa [Japon] ; GONGHUI WANG [Japon] ; Hiroshi Fukuoka [Japon] ; Dmitri A. Vankov [Japon]Source :
- Journal of geotechnical and geoenvironmental engineering [ 1090-0241 ] ; 2005.
Descripteurs français
- Pascal (Inist)
English descriptors
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Abstract
By conducting a series of shear-torque-controlled (STC) and shear-displacement-controlled (SDC) ring shear tests under undrained conditions, the effects of cyclic loading frequency, shear displacement rate, and overconsolidation ratio (OCR) on the pore-pressure generation were examined and analyzed by means of an energy approach. Cyclic STC tests demonstrated that as the frequency of loading increased, the shear energy (Wtoal) as well as the total shear displacement (ltotal) until liquefaction substantially decreased, while the number of cycles to liquefaction (N) increased with frequency. Nevertheless, SDC tests showed that Wtotal, ltotal, N did not vary with frequency. This dependency of Wtotal on the loading frequency in STC tests was inferred to be due to the different resultant shear displacement amplitude after shear failure but before liquefaction during cyclic shearing. The results of STC tests on samples with different OCRs showed that all these three parameters of Wtotal, ltotal, N increased with OCR. The SDC tests at different shear-displacement amplitude (Δlmax) showed that there existed an optimal Δlmax at which Wtotal was minimum. Δlmax smaller than this optimal value was probably not as effective at enforcing the grains to adjust their position, and then it was difficult for the volume shrinkage to occur and pore-water pressure to generate; while an increase in Δlmax from this optimal value led to extra energy consumption probably due to grain crushing and heat transferring from grains friction, and then elevate the value of Wtotal for liquefaction. These results proved that pore-pressure generation in undrained cyclic loading was strongly dependent on the shear-displacement amplitude during the shearing.
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Vankov</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Graduate School of Science, Kyoto Univ</s1><s2>Kyoto 611-0011</s2><s3>JPN</s3><sZ>4 aut.</sZ></inist:fA14><country>Japon</country><wicri:noRegion>Kyoto 611-0011</wicri:noRegion></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">05-0450793</idno><date when="2005">2005</date><idno type="stanalyst">PASCAL 05-0450793 INIST</idno><idno type="RBID">Pascal:05-0450793</idno><idno type="wicri:Area/PascalFrancis/Corpus">000434</idno><idno type="wicri:Area/PascalFrancis/Curation">000353</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000381</idno><idno type="wicri:doubleKey">1090-0241:2005:Sassa K:shear:displacement:amplitude</idno><idno type="wicri:Area/Main/Merge">001411</idno><idno type="wicri:Area/Main/Curation">001374</idno><idno type="wicri:Area/Main/Exploration">001374</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Shear-displacement-amplitude dependent pore-pressure generation in undrained cyclic loading ring shear tests : An energy approach</title><author><name sortKey="Sassa, Kyoji" sort="Sassa, Kyoji" uniqKey="Sassa K" first="Kyoji" last="Sassa">Kyoji Sassa</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Disaster Prevention Research Institute, Kyoto Univ</s1><s2>Kyoto 611-0011</s2><s3>JPN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><wicri:noRegion>Kyoto 611-0011</wicri:noRegion></affiliation></author><author><name sortKey="Gonghui Wang" sort="Gonghui Wang" uniqKey="Gonghui Wang" last="Gonghui Wang">GONGHUI WANG</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Disaster Prevention Research Institute, Kyoto Univ</s1><s2>Kyoto 611-0011</s2><s3>JPN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><wicri:noRegion>Kyoto 611-0011</wicri:noRegion></affiliation></author><author><name sortKey="Fukuoka, Hiroshi" sort="Fukuoka, Hiroshi" uniqKey="Fukuoka H" first="Hiroshi" last="Fukuoka">Hiroshi Fukuoka</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Disaster Prevention Research Institute, Kyoto Univ</s1><s2>Kyoto 611-0011</s2><s3>JPN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>Japon</country><wicri:noRegion>Kyoto 611-0011</wicri:noRegion></affiliation></author><author><name sortKey="Vankov, Dmitri A" sort="Vankov, Dmitri A" uniqKey="Vankov D" first="Dmitri A." last="Vankov">Dmitri A. Vankov</name><affiliation wicri:level="1"><inist:fA14 i1="02"><s1>Graduate School of Science, Kyoto Univ</s1><s2>Kyoto 611-0011</s2><s3>JPN</s3><sZ>4 aut.</sZ></inist:fA14><country>Japon</country><wicri:noRegion>Kyoto 611-0011</wicri:noRegion></affiliation></author></analytic><series><title level="j" type="main">Journal of geotechnical and geoenvironmental engineering</title><title level="j" type="abbreviated">J. geotech. geoenviron. eng.</title><idno type="ISSN">1090-0241</idno><imprint><date when="2005">2005</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of geotechnical and geoenvironmental engineering</title><title level="j" type="abbreviated">J. geotech. geoenviron. eng.</title><idno type="ISSN">1090-0241</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Cyclic load</term><term>Displacement</term><term>Experimental study</term><term>Liquefaction</term><term>Overconsolidated soil</term><term>Pore pressure</term><term>Sand</term><term>Shear test</term><term>Soil test</term><term>Undrained soil test</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Essai sol</term><term>Sable</term><term>Etude expérimentale</term><term>Essai cisaillement</term><term>Déplacement</term><term>Pression pores</term><term>Charge cyclique</term><term>Essai non drainé</term><term>Sol surconsolidé</term><term>Liquéfaction</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">By conducting a series of shear-torque-controlled (STC) and shear-displacement-controlled (SDC) ring shear tests under undrained conditions, the effects of cyclic loading frequency, shear displacement rate, and overconsolidation ratio (OCR) on the pore-pressure generation were examined and analyzed by means of an energy approach. Cyclic STC tests demonstrated that as the frequency of loading increased, the shear energy (W<sub>toal</sub>) as well as the total shear displacement (l<sub>total</sub>) until liquefaction substantially decreased, while the number of cycles to liquefaction (N) increased with frequency. Nevertheless, SDC tests showed that W<sub>total</sub>, l<sub>total</sub>, N did not vary with frequency. This dependency of W<sub>total</sub> on the loading frequency in STC tests was inferred to be due to the different resultant shear displacement amplitude after shear failure but before liquefaction during cyclic shearing. The results of STC tests on samples with different OCRs showed that all these three parameters of W<sub>total</sub>, l<sub>total</sub>, N increased with OCR. The SDC tests at different shear-displacement amplitude (Δl<sub>max</sub>) showed that there existed an optimal Δl<sub>max</sub> at which W<sub>total</sub> was minimum. Δl<sub>max</sub> smaller than this optimal value was probably not as effective at enforcing the grains to adjust their position, and then it was difficult for the volume shrinkage to occur and pore-water pressure to generate; while an increase in Δl<sub>max</sub> from this optimal value led to extra energy consumption probably due to grain crushing and heat transferring from grains friction, and then elevate the value of W<sub>total</sub> for liquefaction. These results proved that pore-pressure generation in undrained cyclic loading was strongly dependent on the shear-displacement amplitude during the shearing.</div></front></TEI><affiliations><list><country><li>Japon</li></country></list><tree><country name="Japon"><noRegion><name sortKey="Sassa, Kyoji" sort="Sassa, Kyoji" uniqKey="Sassa K" first="Kyoji" last="Sassa">Kyoji Sassa</name></noRegion><name sortKey="Fukuoka, Hiroshi" sort="Fukuoka, Hiroshi" uniqKey="Fukuoka H" first="Hiroshi" last="Fukuoka">Hiroshi Fukuoka</name><name sortKey="Gonghui Wang" sort="Gonghui Wang" uniqKey="Gonghui Wang" last="Gonghui Wang">GONGHUI WANG</name><name sortKey="Vankov, Dmitri A" sort="Vankov, Dmitri A" uniqKey="Vankov D" first="Dmitri A." last="Vankov">Dmitri A. Vankov</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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