Field evaluation of large-scale, shallow ground improvements to mitigate liquefaction triggering

dc.contributor.advisorStokoe, Kenneth H.
dc.contributor.committeeMemberAndrus, Ronald D.
dc.contributor.committeeMemberCox, Brady R.
dc.contributor.committeeMemberRathje, Ellen M.
dc.contributor.committeeMemberWilson, Clark R.
dc.creatorRoberts, Julia Nicole
dc.creator.orcid0000-0001-8745-7895
dc.date.accessioned2018-01-30T20:46:04Z
dc.date.available2018-01-30T20:46:04Z
dc.date.created2017-12
dc.date.issued2017-10-26
dc.date.submittedDecember 2017
dc.date.updated2018-01-30T20:46:04Z
dc.description.abstractMuch of the devastation wrought by the 2010-2011 Canterbury Earthquake Sequence (CES) in Christchurch, New Zealand, was caused by extreme levels of liquefaction-induced damage to structures with shallow foundations. In response to this disaster, the New Zealand Earthquake Commission (EQC) funded a large study known as the Ground Improvement Trials to evaluate and identify shallow ground improvement methods that are not only effective at increasing the soil’s resistance to soil liquefaction, but are also cost effective and practical to build for lightweight structures. Of the nine ground improvement methods included in the trials, three were selected for extensive analysis in this dissertation. These three ground improvement methods are the Rapid Impact Compaction (RIC), the Rammed Aggregate PiersTM (RAP), and the Low-Mobility Grout (LMG). At three test sites along the Avon River in Christchurch neighborhoods that were among the worst hit by liquefaction-related damage, full-scale test panels of natural soil and ground-improved soil were constructed and evaluated using a variety of in situ test methods. The analysis in this dissertation primarily relies on data from excavation trenching, cone penetrometer testing (CPT), direct-push crosshole testing (DPCH), and shake testing with T-Rex. These tests capture changes in density and stiffness, and therefore liquefaction resistance, due to the ground improvement methods in comparison to the natural soil. Shake testing with T-Rex is further able to define the relationship between cyclic shear strain and the generation of excess pore pressure that ultimately determines whether or not a soil will liquefy under cyclic loading. Under this framework, the effectiveness of each of the three ground improvement methods is evaluated and discussed.
dc.description.departmentCivil, Architectural, and Environmental Engineering
dc.format.mimetypeapplication/pdf
dc.identifierdoi:10.15781/T26M33M12
dc.identifier.urihttp://hdl.handle.net/2152/63347
dc.language.isoen
dc.subjectSoil liquefaction
dc.subjectGround improvement
dc.subjectCpt
dc.subjectCrosshole testing
dc.subjectT-Rex
dc.subjectIn situ
dc.subjectChristchurch
dc.subjectNew Zealand
dc.subjectShake testing
dc.titleField evaluation of large-scale, shallow ground improvements to mitigate liquefaction triggering
dc.typeThesis
dc.type.materialtext
thesis.degree.departmentCivil, Architectural, and Environmental Engineering
thesis.degree.disciplineCivil Engineering
thesis.degree.grantorThe University of Texas at Austin
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
ROBERTS-DISSERTATION-2017.pdf
Size:
9.88 MB
Format:
Adobe Portable Document Format
License bundle
Now showing 1 - 2 of 2
No Thumbnail Available
Name:
PROQUEST_LICENSE.txt
Size:
4.45 KB
Format:
Plain Text
Description:
No Thumbnail Available
Name:
LICENSE.txt
Size:
1.84 KB
Format:
Plain Text
Description: