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dc.contributor.authorGirsang, Christian Hariadyen_US
dc.date.accessioned2014-03-14T20:50:34Z
dc.date.available2014-03-14T20:50:34Z
dc.date.issued2001-12-20en_US
dc.identifier.otheretd-12212001-133242en_US
dc.identifier.urihttp://hdl.handle.net/10919/36363
dc.description.abstractThe response of an aggregate pier foundation system during seismic loading was investigated. The factors and phenomena governing the performance of the aggregate pier and the improved ground were identified and clarified. The key factors affecting the performance of the aggregate pier include soil density, stiffness modulus, and drainage capacity. The improved ground is influenced by soil stratification, soil properties, pore pressure dissipation, and earthquake time history. Comprehensive numerical modeling using FLAC were performed. The focus of the study in this research was divided into three parts: the studies of the ground acceleration, the excess pore water pressure ratio and the shear stress in soil matrix generated during seismic loading. Two earthquake time histories scaled to different peak acceleration were used in the numerical modeling: the 1989 Loma Prieta earthquake (pga = 0.45g) and the 1988 Saguenay earthquake (pga = 0.05g). The main results of the simulation showed the following effects of aggregate pier on liquefiable soil deposits: 1) The aggregate pier amplifies the peak horizontal acceleration on the ground surface (amax), 2) The aggregate pier reduces the liquefaction potential up to depth where it is installed, 3) Pore pressures are generally lower for soils reinforced with aggregate pier than unreinforced soils except for very strong earthquake, 4) The maximum shear stresses in soil are much smaller for reinforced soils than unreinforced soils. The excess pore water pressure ratio and the shear stress in the soil matrix calculated by FLAC were generally lower than those predicted by available procedures.en_US
dc.publisherVirginia Techen_US
dc.relation.haspart05Table_of_contents.pdfen_US
dc.relation.haspart11Chapter_4.pdfen_US
dc.relation.haspart06List_of_tables.pdfen_US
dc.relation.haspart18Vita.pdfen_US
dc.relation.haspart17Appendix_A.pdfen_US
dc.relation.haspart07List_of_figures.pdfen_US
dc.relation.haspart03Dedication.pdfen_US
dc.relation.haspart01Title.pdfen_US
dc.relation.haspart13Chapter_6.pdfen_US
dc.relation.haspart16References.pdfen_US
dc.relation.haspart09Chapter_2.pdfen_US
dc.relation.haspart15Chapter_8.pdfen_US
dc.relation.haspart08Chapter_1.pdfen_US
dc.relation.haspart10Chapter_3.pdfen_US
dc.relation.haspart14Chapter_7.pdfen_US
dc.relation.haspart02Abstract.pdfen_US
dc.relation.haspart04Acknowledgment.pdfen_US
dc.relation.haspart12Chapter_5.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectliquefactionen_US
dc.subjectaggregate pieren_US
dc.subjectground improvementen_US
dc.subjectnumerical modelingen_US
dc.subjectearthquakeen_US
dc.subjectmitigationen_US
dc.titleA Numerical Investigation of the Seismic Response of the Aggregate Pier Foundation Systemen_US
dc.typeThesisen_US
dc.contributor.departmentCivil Engineeringen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
dc.contributor.committeechairGutierrez, Marte S.en_US
dc.contributor.committeememberMitchell, James K.en_US
dc.contributor.committeememberMartin, James R. IIen_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12212001-133242/en_US
dc.date.sdate2001-12-21en_US
dc.date.rdate2003-01-02
dc.date.adate2002-01-02en_US


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