dc.contributor.author	Girsang, Christian Hariady	en
dc.contributor.committeechair	Gutierrez, Marte S.	en
dc.contributor.committeemember	Mitchell, James K.	en
dc.contributor.committeemember	Martin, James R. II	en
dc.contributor.department	Civil Engineering	en
dc.date.accessioned	2014-03-14T20:50:34Z	en
dc.date.adate	2002-01-02	en
dc.date.available	2014-03-14T20:50:34Z	en
dc.date.issued	2001-12-20	en
dc.date.rdate	2003-01-02	en
dc.date.sdate	2001-12-21	en
dc.description.abstract	The 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
dc.description.degree	Master of Science	en
dc.identifier.other	etd-12212001-133242	en
dc.identifier.sourceurl	http://scholar.lib.vt.edu/theses/available/etd-12212001-133242/	en
dc.identifier.uri	http://hdl.handle.net/10919/36363	en
dc.publisher	Virginia Tech	en
dc.relation.haspart	05Table_of_contents.pdf	en
dc.relation.haspart	11Chapter_4.pdf	en
dc.relation.haspart	06List_of_tables.pdf	en
dc.relation.haspart	18Vita.pdf	en
dc.relation.haspart	17Appendix_A.pdf	en
dc.relation.haspart	07List_of_figures.pdf	en
dc.relation.haspart	03Dedication.pdf	en
dc.relation.haspart	01Title.pdf	en
dc.relation.haspart	13Chapter_6.pdf	en
dc.relation.haspart	16References.pdf	en
dc.relation.haspart	09Chapter_2.pdf	en
dc.relation.haspart	15Chapter_8.pdf	en
dc.relation.haspart	08Chapter_1.pdf	en
dc.relation.haspart	10Chapter_3.pdf	en
dc.relation.haspart	14Chapter_7.pdf	en
dc.relation.haspart	02Abstract.pdf	en
dc.relation.haspart	04Acknowledgment.pdf	en
dc.relation.haspart	12Chapter_5.pdf	en
dc.rights	In Copyright	en
dc.rights.uri	http://rightsstatements.org/vocab/InC/1.0/	en
dc.subject	liquefaction	en
dc.subject	aggregate pier	en
dc.subject	ground improvement	en
dc.subject	numerical modeling	en
dc.subject	earthquake	en
dc.subject	mitigation	en
dc.title	A Numerical Investigation of the Seismic Response of the Aggregate Pier Foundation System	en
dc.type	Thesis	en
thesis.degree.discipline	Civil Engineering	en
thesis.degree.grantor	Virginia Polytechnic Institute and State University	en
thesis.degree.level	masters	en
thesis.degree.name	Master of Science	en

A Numerical Investigation of the Seismic Response of the Aggregate Pier Foundation System

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