Effect of ageing on stiffness of very loose sand
The paper presents the results of laboratory triaxial compression tests to study the stiffness of very loose Fraser River sands. The stiffness has been shown to be very dependent on the time of confinement prior to shearing and the stress ratio at which the sample is aged. Higher stress ratios resul...
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| Veröffentlicht in: | Canadian geotechnical journal 2002-02, Vol.39 (1), p.149-156 |
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| creator | Howie, J A Shozen, T Vaid, Y P |
| description | The paper presents the results of laboratory triaxial compression tests to study the stiffness of very loose Fraser River sands. The stiffness has been shown to be very dependent on the time of confinement prior to shearing and the stress ratio at which the sample is aged. Higher stress ratios resulted in very low initial moduli with no ageing, but the moduli increased by several hundred percent during the first 1000 min of ageing. For ageing at a stress ratio of 1.0 (i.e., isotropic ageing), the initial moduli were higher than those for ageing at high stress ratios, but the stiffness increased by only about 60% during the first 1000 min of ageing. The rate of stiffness increase was approximately linear with the logarithm of time up to ageing times of 10 000 min (>1 week). Ageing at any stress ratio resulted in reduced contractive volumetric strain during subsequent shearing, reflecting a change in soil structure during ageing. The d ε
v
/d ε
a
ratio under triaxial compression loading decreased as the ageing stress ratio increased. The results suggest that close attention must be paid to the age of laboratory samples prepared to study the stressstrain response of sands at strains up to about 0.1%, particularly in studies on loose sand.Key words: sands, ageing, creep, modulus. |
| doi_str_mv | 10.1139/t01-085 |
| format | Article |
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v
/d ε
a
ratio under triaxial compression loading decreased as the ageing stress ratio increased. The results suggest that close attention must be paid to the age of laboratory samples prepared to study the stressstrain response of sands at strains up to about 0.1%, particularly in studies on loose sand.Key words: sands, ageing, creep, modulus.</description><identifier>ISSN: 0008-3674</identifier><identifier>EISSN: 1208-6010</identifier><identifier>DOI: 10.1139/t01-085</identifier><identifier>CODEN: CGJOAH</identifier><language>eng</language><publisher>Ottawa, Canada: NRC Research Press</publisher><subject>Earth sciences ; Earth, ocean, space ; Engineering and environment geology. Geothermics ; Engineering geology ; Exact sciences and technology ; Sand & gravel ; Soil mechanics</subject><ispartof>Canadian geotechnical journal, 2002-02, Vol.39 (1), p.149-156</ispartof><rights>2002 INIST-CNRS</rights><rights>Copyright National Research Council of Canada Feb 2002</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a464t-51f3638d2fb49568fedd1be15b258034ec918fd7708d23553d8afa0cba18f563</citedby><cites>FETCH-LOGICAL-a464t-51f3638d2fb49568fedd1be15b258034ec918fd7708d23553d8afa0cba18f563</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://cdnsciencepub.com/doi/pdf/10.1139/t01-085$$EPDF$$P50$$Gnrcresearch$$H</linktopdf><linktohtml>$$Uhttps://cdnsciencepub.com/doi/full/10.1139/t01-085$$EHTML$$P50$$Gnrcresearch$$H</linktohtml><link.rule.ids>314,776,780,2919,27901,27902,64401,65207</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=13589437$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Howie, J A</creatorcontrib><creatorcontrib>Shozen, T</creatorcontrib><creatorcontrib>Vaid, Y P</creatorcontrib><title>Effect of ageing on stiffness of very loose sand</title><title>Canadian geotechnical journal</title><addtitle>Revue canadienne de géotechnique</addtitle><description>The paper presents the results of laboratory triaxial compression tests to study the stiffness of very loose Fraser River sands. The stiffness has been shown to be very dependent on the time of confinement prior to shearing and the stress ratio at which the sample is aged. Higher stress ratios resulted in very low initial moduli with no ageing, but the moduli increased by several hundred percent during the first 1000 min of ageing. For ageing at a stress ratio of 1.0 (i.e., isotropic ageing), the initial moduli were higher than those for ageing at high stress ratios, but the stiffness increased by only about 60% during the first 1000 min of ageing. The rate of stiffness increase was approximately linear with the logarithm of time up to ageing times of 10 000 min (>1 week). Ageing at any stress ratio resulted in reduced contractive volumetric strain during subsequent shearing, reflecting a change in soil structure during ageing. The d ε
v
/d ε
a
ratio under triaxial compression loading decreased as the ageing stress ratio increased. The results suggest that close attention must be paid to the age of laboratory samples prepared to study the stressstrain response of sands at strains up to about 0.1%, particularly in studies on loose sand.Key words: sands, ageing, creep, modulus.</description><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Engineering and environment geology. Geothermics</subject><subject>Engineering geology</subject><subject>Exact sciences and technology</subject><subject>Sand & gravel</subject><subject>Soil mechanics</subject><issn>0008-3674</issn><issn>1208-6010</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2002</creationdate><recordtype>article</recordtype><sourceid>BENPR</sourceid><recordid>eNqF0dtKAzEQBuAgCtYqvsIieEBYnclhN3sppR6g4E3vQ5pN6pbtpiZboW9vSguCYL2aYfj4YfgJuUR4QGTVYw-YgxRHZIAUZF4AwjEZAKSdFSU_JWcxLgCQc0oHBMbOWdNn3mV6bptunvkui33jXGdj3J6_bNhkrffRZlF39Tk5cbqN9mI_h2T6PJ6OXvPJ-8vb6GmSa17wPhfoWMFkTd2MV6KQztY1ziyKGRUSGLemQunqsoRkmBCsltppMDOdzqJgQ3Kzi10F_7m2sVfLJhrbtrqzfh0VLRGRSvovxLIoJKswwbvDUFDkwCrBEr36RRd-Hbr0rqLImKg4yIRud8gEH2OwTq1Cs9RhoxDUtgmVmlCpiSSv93E6Gt26oDvTxB_OhKw4K5O737kumGCj1cF8HAi9-RvvkVrVjn0D98KgLg</recordid><startdate>20020201</startdate><enddate>20020201</enddate><creator>Howie, J A</creator><creator>Shozen, T</creator><creator>Vaid, Y P</creator><general>NRC Research Press</general><general>National Research Council of Canada</general><general>Canadian Science Publishing NRC Research Press</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>3V.</scope><scope>7TG</scope><scope>7UA</scope><scope>7XB</scope><scope>88I</scope><scope>8AF</scope><scope>8FD</scope><scope>8FE</scope><scope>8FG</scope><scope>8FK</scope><scope>8FQ</scope><scope>8FV</scope><scope>ABJCF</scope><scope>ABUWG</scope><scope>AEUYN</scope><scope>AFKRA</scope><scope>AZQEC</scope><scope>BENPR</scope><scope>BGLVJ</scope><scope>BHPHI</scope><scope>BKSAR</scope><scope>C1K</scope><scope>CCPQU</scope><scope>DWQXO</scope><scope>F1W</scope><scope>FR3</scope><scope>GNUQQ</scope><scope>H96</scope><scope>HCIFZ</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L6V</scope><scope>M2P</scope><scope>M3G</scope><scope>M7S</scope><scope>PCBAR</scope><scope>PHGZM</scope><scope>PHGZT</scope><scope>PKEHL</scope><scope>PQEST</scope><scope>PQGLB</scope><scope>PQQKQ</scope><scope>PQUKI</scope><scope>PTHSS</scope><scope>Q9U</scope></search><sort><creationdate>20020201</creationdate><title>Effect of ageing on stiffness of very loose sand</title><author>Howie, J A ; Shozen, T ; Vaid, Y P</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a464t-51f3638d2fb49568fedd1be15b258034ec918fd7708d23553d8afa0cba18f563</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2002</creationdate><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Engineering and environment geology. Geothermics</topic><topic>Engineering geology</topic><topic>Exact sciences and technology</topic><topic>Sand & gravel</topic><topic>Soil mechanics</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Howie, J A</creatorcontrib><creatorcontrib>Shozen, T</creatorcontrib><creatorcontrib>Vaid, Y P</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Water Resources Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>STEM Database</collection><collection>Technology Research Database</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Canadian Business & Current Affairs Database</collection><collection>Canadian Business & Current Affairs Database (Alumni Edition)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest One Sustainability</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ProQuest One Community College</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>ProQuest Central Student</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>ProQuest Engineering Collection</collection><collection>Science Database</collection><collection>CBCA Reference & Current Events</collection><collection>Engineering Database</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>ProQuest Central (New)</collection><collection>ProQuest One Academic (New)</collection><collection>ProQuest One Academic Middle East (New)</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Applied & Life Sciences</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>ProQuest Central Basic</collection><jtitle>Canadian geotechnical journal</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Howie, J A</au><au>Shozen, T</au><au>Vaid, Y P</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Effect of ageing on stiffness of very loose sand</atitle><jtitle>Canadian geotechnical journal</jtitle><addtitle>Revue canadienne de géotechnique</addtitle><date>2002-02-01</date><risdate>2002</risdate><volume>39</volume><issue>1</issue><spage>149</spage><epage>156</epage><pages>149-156</pages><issn>0008-3674</issn><eissn>1208-6010</eissn><coden>CGJOAH</coden><abstract>The paper presents the results of laboratory triaxial compression tests to study the stiffness of very loose Fraser River sands. The stiffness has been shown to be very dependent on the time of confinement prior to shearing and the stress ratio at which the sample is aged. Higher stress ratios resulted in very low initial moduli with no ageing, but the moduli increased by several hundred percent during the first 1000 min of ageing. For ageing at a stress ratio of 1.0 (i.e., isotropic ageing), the initial moduli were higher than those for ageing at high stress ratios, but the stiffness increased by only about 60% during the first 1000 min of ageing. The rate of stiffness increase was approximately linear with the logarithm of time up to ageing times of 10 000 min (>1 week). Ageing at any stress ratio resulted in reduced contractive volumetric strain during subsequent shearing, reflecting a change in soil structure during ageing. The d ε
v
/d ε
a
ratio under triaxial compression loading decreased as the ageing stress ratio increased. The results suggest that close attention must be paid to the age of laboratory samples prepared to study the stressstrain response of sands at strains up to about 0.1%, particularly in studies on loose sand.Key words: sands, ageing, creep, modulus.</abstract><cop>Ottawa, Canada</cop><pub>NRC Research Press</pub><doi>10.1139/t01-085</doi><tpages>8</tpages></addata></record> |
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| source | NRC Research Press; Alma/SFX Local Collection |
| subjects | Earth sciences Earth, ocean, space Engineering and environment geology. Geothermics Engineering geology Exact sciences and technology Sand & gravel Soil mechanics |
| title | Effect of ageing on stiffness of very loose sand |
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