Experimental Study of Wellbore Instability in Clays
Identifieur interne : 000566 ( Main/Exploration ); précédent : 000565; suivant : 000567Experimental Study of Wellbore Instability in Clays
Auteurs : Naeem O. Abdulhadi [Jordanie] ; John T. Germaine [États-Unis] ; Andrew J. Whittle [États-Unis]Source :
- Journal of geotechnical and geoenvironmental engineering [ 1090-0241 ] ; 2011.
Descripteurs français
- Pascal (Inist)
English descriptors
- KwdEn :
Abstract
This paper presents the results of an extensive program of laboratory model wellbore tests that have been performed to study wellbore instability in saturated clays. The tests were conducted on resedimented Boston blue clay (RBBC) anisotropically consolidated to vertical effective stresses up to 10 MPa by using two custom-built thick-walled cylinder (TWC) devices with outer diameters Do = 7.6 and 15.2 cm. The experimental program investigated the effects of specimen geometry, mode of loading, strain rate, consolidation stress level, and overconsolidation ratio (OCR) on deformations of the model wellbore measured during undrained shearing. Results indicate that for normally consolidated clays most of the change in cavity pressure occurs at volumetric strains less than 5% after which the borehole becomes unstable. Increases in outer diameter and strain rate led to a reduction in the minimum borehole pressure. Stress-strain properties were interpreted by using an analysis procedure originally developed for undrained plane strain expansion of hollow cylinders. The backfigured undrained strength ratios from these analyses for normally consolidated specimens range from su/σ'vc = 0.19-0.22. Overconsolidation greatly improves the stability of the borehole, and interpreted undrained strength ratios from the TWC tests are consistent with well-known power law functions previously developed for elemental shear tests.
Affiliations:
Links toward previous steps (curation, corpus...)
- to stream PascalFrancis, to step Corpus: 000120
- to stream PascalFrancis, to step Curation: 000653
- to stream PascalFrancis, to step Checkpoint: 000120
- to stream Main, to step Merge: 000572
- to stream Main, to step Curation: 000566
Le document en format XML
<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Experimental Study of Wellbore Instability in Clays</title><author><name sortKey="Abdulhadi, Naeem O" sort="Abdulhadi, Naeem O" uniqKey="Abdulhadi N" first="Naeem O." last="Abdulhadi">Naeem O. Abdulhadi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Arab Center for Engineering Studies (ACES), P.O. Box 5504</s1><s2>Amman 11183</s2><s3>JOR</s3><sZ>1 aut.</sZ></inist:fA14><country>Jordanie</country><wicri:noRegion>Amman 11183</wicri:noRegion></affiliation></author><author><name sortKey="Germaine, John T" sort="Germaine, John T" uniqKey="Germaine J" first="John T." last="Germaine">John T. Germaine</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave.</s1><s2>Cambridge, MA 02139</s2><s3>USA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Massachusetts</region></placeName></affiliation></author><author><name sortKey="Whittle, Andrew J" sort="Whittle, Andrew J" uniqKey="Whittle A" first="Andrew J." last="Whittle">Andrew J. Whittle</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave.</s1><s2>Cambridge, MA 02139</s2><s3>USA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Massachusetts</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">11-0382151</idno><date when="2011">2011</date><idno type="stanalyst">PASCAL 11-0382151 INIST</idno><idno type="RBID">Pascal:11-0382151</idno><idno type="wicri:Area/PascalFrancis/Corpus">000120</idno><idno type="wicri:Area/PascalFrancis/Curation">000653</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000120</idno><idno type="wicri:doubleKey">1090-0241:2011:Abdulhadi N:experimental:study:of</idno><idno type="wicri:Area/Main/Merge">000572</idno><idno type="wicri:Area/Main/Curation">000566</idno><idno type="wicri:Area/Main/Exploration">000566</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Experimental Study of Wellbore Instability in Clays</title><author><name sortKey="Abdulhadi, Naeem O" sort="Abdulhadi, Naeem O" uniqKey="Abdulhadi N" first="Naeem O." last="Abdulhadi">Naeem O. Abdulhadi</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Arab Center for Engineering Studies (ACES), P.O. Box 5504</s1><s2>Amman 11183</s2><s3>JOR</s3><sZ>1 aut.</sZ></inist:fA14><country>Jordanie</country><wicri:noRegion>Amman 11183</wicri:noRegion></affiliation></author><author><name sortKey="Germaine, John T" sort="Germaine, John T" uniqKey="Germaine J" first="John T." last="Germaine">John T. Germaine</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave.</s1><s2>Cambridge, MA 02139</s2><s3>USA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Massachusetts</region></placeName></affiliation></author><author><name sortKey="Whittle, Andrew J" sort="Whittle, Andrew J" uniqKey="Whittle A" first="Andrew J." last="Whittle">Andrew J. Whittle</name><affiliation wicri:level="2"><inist:fA14 i1="02"><s1>Dept. of Civil and Environmental Engineering, Massachusetts Institute of Technology, 77 Massachusetts Ave.</s1><s2>Cambridge, MA 02139</s2><s3>USA</s3><sZ>2 aut.</sZ><sZ>3 aut.</sZ></inist:fA14><country>États-Unis</country><placeName><region type="state">Massachusetts</region></placeName></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="2011">2011</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>Borehole</term><term>Clay</term><term>Consolidation</term><term>Experimental study</term><term>Geometry</term><term>Instability</term><term>Laboratory test</term><term>Model test</term><term>Saturated soil</term><term>Shear strength</term><term>Soil test</term><term>Stress strain relation</term><term>Thick wall</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Essai sol</term><term>Argile</term><term>Trou forage</term><term>Etude expérimentale</term><term>Essai laboratoire</term><term>Essai sur modèle</term><term>Sol saturé</term><term>Résistance cisaillement</term><term>Instabilité</term><term>Paroi épaisse</term><term>Géométrie</term><term>Relation contrainte déformation</term><term>Consolidation</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">This paper presents the results of an extensive program of laboratory model wellbore tests that have been performed to study wellbore instability in saturated clays. The tests were conducted on resedimented Boston blue clay (RBBC) anisotropically consolidated to vertical effective stresses up to 10 MPa by using two custom-built thick-walled cylinder (TWC) devices with outer diameters D<sub>o</sub> = 7.6 and 15.2 cm. The experimental program investigated the effects of specimen geometry, mode of loading, strain rate, consolidation stress level, and overconsolidation ratio (OCR) on deformations of the model wellbore measured during undrained shearing. Results indicate that for normally consolidated clays most of the change in cavity pressure occurs at volumetric strains less than 5% after which the borehole becomes unstable. Increases in outer diameter and strain rate led to a reduction in the minimum borehole pressure. Stress-strain properties were interpreted by using an analysis procedure originally developed for undrained plane strain expansion of hollow cylinders. The backfigured undrained strength ratios from these analyses for normally consolidated specimens range from s<sub>u</sub>/σ'<sub>vc</sub> = 0.19-0.22. Overconsolidation greatly improves the stability of the borehole, and interpreted undrained strength ratios from the TWC tests are consistent with well-known power law functions previously developed for elemental shear tests.</div></front></TEI><affiliations><list><country><li>Jordanie</li><li>États-Unis</li></country><region><li>Massachusetts</li></region></list><tree><country name="Jordanie"><noRegion><name sortKey="Abdulhadi, Naeem O" sort="Abdulhadi, Naeem O" uniqKey="Abdulhadi N" first="Naeem O." last="Abdulhadi">Naeem O. Abdulhadi</name></noRegion></country><country name="États-Unis"><region name="Massachusetts"><name sortKey="Germaine, John T" sort="Germaine, John T" uniqKey="Germaine J" first="John T." last="Germaine">John T. Germaine</name></region><name sortKey="Whittle, Andrew J" sort="Whittle, Andrew J" uniqKey="Whittle A" first="Andrew J." last="Whittle">Andrew J. Whittle</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
EXPLOR_STEP=$WICRI_ROOT/Ticri/CIDE/explor/OcrV1/Data/Main/Exploration
HfdSelect -h $EXPLOR_STEP/biblio.hfd -nk 000566 | SxmlIndent | more
Ou
HfdSelect -h $EXPLOR_AREA/Data/Main/Exploration/biblio.hfd -nk 000566 | SxmlIndent | more
Pour mettre un lien sur cette page dans le réseau Wicri
{{Explor lien
|wiki= Ticri/CIDE
|area= OcrV1
|flux= Main
|étape= Exploration
|type= RBID
|clé= Pascal:11-0382151
|texte= Experimental Study of Wellbore Instability in Clays
}}
| This area was generated with Dilib version V0.6.32. |  |