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Liquefaction Analysis of Level and Sloping Ground Using Field Case Histories and Penetration Resistance
No full text547 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001.Lastly, the author proposed a comprehensive liquefaction analysis procedure for sandy soils to evaluate liquefaction susceptibility, liquefaction triggering, and post-triggering stability. The procedure incorporates the proposed relationships to estimate yield and liquefied strength ratio, and does not require a suite of laboratory tests or corrections for sloping ground and vertical effective stress. The procedure is verified initially using the Lower San Fernando Dam case history.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Liquefaction Analysis of Level and Sloping Ground Using Field Case Histories and Penetration Resistance
No full textLastly, the author proposed a comprehensive liquefaction analysis procedure for sandy soils to evaluate liquefaction susceptibility, liquefaction triggering, and post-triggering stability. The procedure incorporates the proposed relationships to estimate yield and liquefied strength ratio, and does not require a suite of laboratory tests or corrections for sloping ground and vertical effective stress. The procedure is verified initially using the Lower San Fernando Dam case history.Made available in DSpace on 2015-09-25T21:03:13Z (GMT). No. of bitstreams: 2
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Previous issue date: 2001Embargo set by: Seth Robbins for item 84449
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Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only547 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2001
Drained shear strength of stiff clays for slope stability analyses
No full textAn investigation has been conducted to gain a better understanding of the drained residual and fully softened shear strengths of cohesive soils, the shear strength mobilized in field case histories involving previous and no previous sliding in stiff clays, and develop empirical relationships that describe the stress-dependent nature of the residual and fully softened shear strengths in terms of soil index properties. To investigate the drained residual strength, a Bromhead ring shear apparatus was modified to allow testing of overconsolidated, presheared, remolded soil specimens of different plasticity and clay-size fraction. Residual shear strengths measured using the modified ring shear apparatus were compared to shear strengths measured in conventional reversal direct shear tests on precut remolded specimens and shear strength values back-calculated from well documented field case histories of slopes that underwent previous sliding. The modified ring shear, direct shear, and triaxial compression apparatuses were used to investigate the fully softened shear strength using normally consolidated, remolded specimens. The natural soils used in the residual and fully softened research have a range of liquid limit of 24 to 286%, plasticity index of 8 to 244%, and clay-size fraction of 10 to 88%.New relationships describing the residual and fully softened friction angles developed from the extensive ring shear testing were presented in terms of the liquid limit, clay-size fraction, and effective normal stress. Most of the existing residual and fully softened strengths relationships are based on only one soil index property and provide a friction angle that is independent of effective normal stress. The importance of incorporating the liquid limit, clay-size fraction, and effective normal stress in estimating the residual and fully softened friction angles was illustrated using field case histories.Several first-time slides through stiff fissured clays were also studied to estimate the shear strength mobilized during failure. Based on these studies and laboratory test results, recommendations for estimating the field shear strength of stiff fissured clay involved in first-time slides were presented.A reanalysis of the 1981 upstream slide in San Luis Dam was conducted to evaluate the shear strength reduction caused by the displacement induced by repeated loading. The effect of plasticity and degree of overconsolidation on this shear strength reduction was investigated.Made available in DSpace on 2011-05-07T12:52:27Z (GMT). No. of bitstreams: 2
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Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Guidelines for the Use of Expanded Polystyrene (eps)-Block Geofoam for the Function of Lightweight Fill in Road Embankment Projects
No full textThis dissertation presents a design guideline or procedure as well as an appropriate material and construction standard. It is anticipated that the results of this study will encourage greater and more consistent use of EPS-block geofoam as an alternative for construction of embankments over soft ground. The ultimate benefit of this is an optimization of both the technical performance as well as cost of EPS-block geofoam embankments. The research has confirmed that EPS-block geofoam can provide a safe and economical solution to problems with construction of roadway embankments on soft soils. Although this study addresses only EPS-block geofoam, the completed design manual can serve as a blueprint for development of design guidelines for other types of lightweight fills.Made available in DSpace on 2015-09-25T21:03:56Z (GMT). No. of bitstreams: 2
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Previous issue date: 2005Embargo set by: Seth Robbins for item 84538
Lift date: Forever
Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only1006 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005
Variations on the Author
Get PDF“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Use of Cone Penetration Testing in the Interpretation of Ground Shaking From Paleoliquefaction Evidence
No full textTo evaluate seismic hazard in regions of infrequent earthquakes it is often necessary to rely on evidence left from earthquakes that occurred before seismographs were available. This evidence can consist of human observations or of evidence left in the geologic record. The New Madrid Seismic Zone is a region where geologic evidence of previous earthquakes can be found in abundance in the form of soil liquefaction features. Present day measurements of liquefaction resistance can be used to estimate the severity of the ground shaking that had to occur to cause the observed liquefaction features. The database of present-day liquefaction cases is refined to add recent data and to cull older data based on a set of criteria that allow the effect of measured fines content on liquefaction resistance to be quantified. This refined database allows for the development of liquefaction resistance relationships based on the magnitude of the earthquake-induced shear stress and on the energy dissipated in the soil during earthquake shaking. To apply the energy-based liquefaction resistance relationship in the NMSZ a relationship between the number of equivalent cycles of shaking and site characteristics is developed based on regional seismological characteristics and site conditions. Back-analyses conducted at paleoliquefaction sites in the NMSZ using these refined tools suggest that the magnitude of the 1811--1812 event that caused the paleoliquefaction features was between 7.0 and 7.9 depending on the choice of ground motion prediction relationship, and the choice of magnitude and ground motion prediction relationship for design should be consistent to avoid significantly overestimating or underestimating ground motions at a site.Made available in DSpace on 2015-09-25T21:04:31Z (GMT). No. of bitstreams: 2
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Previous issue date: 2007Embargo set by: Seth Robbins for item 84644
Lift date: Forever
Reason: Restricted to the U of I community idenfinitely during batch ingest of legacy ETDsRestricted to the U of I community idenfinitely during batch ingest of legacy ETDsU of I Only220 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007
Use of Cone Penetration Testing in the Interpretation of Ground Shaking From Paleoliquefaction Evidence
No full text220 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2007.To evaluate seismic hazard in regions of infrequent earthquakes it is often necessary to rely on evidence left from earthquakes that occurred before seismographs were available. This evidence can consist of human observations or of evidence left in the geologic record. The New Madrid Seismic Zone is a region where geologic evidence of previous earthquakes can be found in abundance in the form of soil liquefaction features. Present day measurements of liquefaction resistance can be used to estimate the severity of the ground shaking that had to occur to cause the observed liquefaction features. The database of present-day liquefaction cases is refined to add recent data and to cull older data based on a set of criteria that allow the effect of measured fines content on liquefaction resistance to be quantified. This refined database allows for the development of liquefaction resistance relationships based on the magnitude of the earthquake-induced shear stress and on the energy dissipated in the soil during earthquake shaking. To apply the energy-based liquefaction resistance relationship in the NMSZ a relationship between the number of equivalent cycles of shaking and site characteristics is developed based on regional seismological characteristics and site conditions. Back-analyses conducted at paleoliquefaction sites in the NMSZ using these refined tools suggest that the magnitude of the 1811--1812 event that caused the paleoliquefaction features was between 7.0 and 7.9 depending on the choice of ground motion prediction relationship, and the choice of magnitude and ground motion prediction relationship for design should be consistent to avoid significantly overestimating or underestimating ground motions at a site.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
Guidelines for the Use of Expanded Polystyrene (eps)-Block Geofoam for the Function of Lightweight Fill in Road Embankment Projects
No full text1006 p.Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2005.This dissertation presents a design guideline or procedure as well as an appropriate material and construction standard. It is anticipated that the results of this study will encourage greater and more consistent use of EPS-block geofoam as an alternative for construction of embankments over soft ground. The ultimate benefit of this is an optimization of both the technical performance as well as cost of EPS-block geofoam embankments. The research has confirmed that EPS-block geofoam can provide a safe and economical solution to problems with construction of roadway embankments on soft soils. Although this study addresses only EPS-block geofoam, the completed design manual can serve as a blueprint for development of design guidelines for other types of lightweight fills.U of I OnlyRestricted to the U of I community idenfinitely during batch ingest of legacy ETD
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