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Articles 177481 - 177510 of 197991

Full-Text Articles in Engineering

Drilled Pier Load Capacity Of Detroit Area Hardpan Using An Overberg Load Cell, L. P. Jedele, T. H. Bedenis Jun 1993

Drilled Pier Load Capacity Of Detroit Area Hardpan Using An Overberg Load Cell, L. P. Jedele, T. H. Bedenis

International Conference on Case Histories in Geotechnical Engineering

Supplemental geotechnical investigations were conducted on two Detroit area projects with the purpose of optimizing design criteria for proposed drilled pier foundations. For both projects, the major effort involved the formulation, implementation and interpretation of a load test using an Osterberg load cell rather than conventional dead weight or reaction piers. Load and settlement trends were monitored with a series of strain gauges and telltales. Field data are presented in graphical form to illustrate the results of the load tests.

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Performance Evaluation Of A Hydraulic Asphalt Concrete Pavement Capping A Hazardous Waste Site, John W. Anthony, Robert J. Sterrett, Greg Shepherd Jun 1993

Performance Evaluation Of A Hydraulic Asphalt Concrete Pavement Capping A Hazardous Waste Site, John W. Anthony, Robert J. Sterrett, Greg Shepherd

International Conference on Case Histories in Geotechnical Engineering

Hydrologic Consultants, Inc. was contracted to undertake the closure of a former pesticide facility. While pesticide compounds were present on the site, they were located primarily in the top two feet of soil. Five remedial action alternatives for the site were reviewed; the remedial action selected was to cap the site. Because of the expense of obtaining clay in sufficient quantities, a less costly alternative to clay was adopted: a high-bitumen-content hydraulic asphalt concrete (HAC) pavement. For preliminary design purposes, a performance assessment was conducted utilizing the Hydraulic Evaluation of Landfill Performance (HELP) model to compare the relative performance of …

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Discussions And Replies Session 11, Karen Brakefield, Aswath V. Rao, Dieter Genske Jun 1993

Discussions And Replies Session 11, Karen Brakefield, Aswath V. Rao, Dieter Genske

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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General Report Session No. 10, 11 And 12: Case Histories Of Geotechnical And Hydrological Management And Remediation Of Solid, Hazardous And Low-Level Radioactive Wastes, Hari D. Sharma Jun 1993

General Report Session No. 10, 11 And 12: Case Histories Of Geotechnical And Hydrological Management And Remediation Of Solid, Hazardous And Low-Level Radioactive Wastes, Hari D. Sharma

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Past Proceedings: Third International Conference On Case Histories In Geotechnical Engineering, St. Louis (1993), Multiple Authors Jun 1993

Past Proceedings: Third International Conference On Case Histories In Geotechnical Engineering, St. Louis (1993), Multiple Authors

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

No abstract provided.

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Discussions And Replies Session 12, C. A. Dougherty, Subijoy Dutta, J. Blayne Kirsch, Clifford Knitter Jun 1993

Discussions And Replies Session 12, C. A. Dougherty, Subijoy Dutta, J. Blayne Kirsch, Clifford Knitter

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Use Of Low Plasticity For Soil Liners And Covers, Clifford C. Knitter, K. G. Haskell, M. L. Peterson Jun 1993

Use Of Low Plasticity For Soil Liners And Covers, Clifford C. Knitter, K. G. Haskell, M. L. Peterson

International Conference on Case Histories in Geotechnical Engineering

Loess, which consists predominantly of low plasticity to non-plastic silt (PI≤10) with varying amounts of sand and clay-sized (- 5 microns) material, covers much of north-central Oregon and eastern Washington. Several landfills operate in this area. Because of the lack of clayey soils and clayey bedrock in the region, loess was proposed for use as the low permeability soil barrier layer. Laboratory testing and large-scale field tests of test fills using SDRI's have shown that the remolded permeability of the loess is related to grain-size, soil gradation, and the percent saturation of the placed soil. We had an approximately 1:1 …

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Deteriorated Concrete Foundation On The Gulf Coast, W. Akili, M. H. El-Haddad Jun 1993

Deteriorated Concrete Foundation On The Gulf Coast, W. Akili, M. H. El-Haddad

International Conference on Case Histories in Geotechnical Engineering

An investigation into the deteriorated condition of a concrete mat foundation under saline water table on a coastal sabkha sand in Qatar, the Arabian Gulf coast, was undertaken. The investigation aided by visual examination, testing (destructive and non-destructive), analysis and consideration of different soil-structure interaction schemes resulted in re-approval of the foundation from a structural integrity point of view; however its water tightness role was judged inadequate and required remedial works. Options for repair of the foundation were examined and proposed. To safeguard against the adverse effects of salts on foundation concrete, appropriate design and construction measures are required.

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Anchored Cutoff Structure Design And Construction, G. K. Burke, G. T. Brill Jun 1993

Anchored Cutoff Structure Design And Construction, G. K. Burke, G. T. Brill

International Conference on Case Histories in Geotechnical Engineering

As part of a new cogeneration plant being built in Jacksonville, Florida, a 31-foot deep excavation was required to install a 173-foot by 53-foot coal unloading structure in loose to medium-dense fine sands with shallow ground water. A conventional system of excavation support would typically consist of installing and maintaining a dewatering system and driving sheet piles. However, due to the potential for shallow contaminated ground water at the site and a restricted amount of inflow treatment capacity, a nearly complete cutoff or "bathtub" structure was required. A system that is relatively new to the United States was designed and …

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Discussions And Replies Session 13, B. S. Y. Chen Jun 1993

Discussions And Replies Session 13, B. S. Y. Chen

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Evaluation Of Consolidation Parameters By Graphical Method, T. Shogaki, M. Kaneko Jun 1993

Evaluation Of Consolidation Parameters By Graphical Method, T. Shogaki, M. Kaneko

International Conference on Case Histories in Geotechnical Engineering

The applicability of the graphical method to estimate the consolidation parameters in the conventional oedometer test is investigated experimentally. The behaviors of settlement and the pore water pressure at the bottom of specimen under one dimensional consolidation for disturbed cohesive soil are discussed in this study, and the length of increment for the graphical method is given as the function of the consolidation pressure. It should be said that the values of consolidation parameters obtained by the graphical method can be same in a practical use as that by the classical methods. When both the graphical method and its application …

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Marta East Line Tunnels Under I-285, Atlanta, Georgia, M. R. Funkhouser, K. P. Akins Jun 1993

Marta East Line Tunnels Under I-285, Atlanta, Georgia, M. R. Funkhouser, K. P. Akins

International Conference on Case Histories in Geotechnical Engineering

The Metropolitan Atlanta Rapid Transit Authority combined three new technologies − microtunneling, jet grouting, and rock-socketed "minipiles" − to successfully construct twin rail tunnels under an eight-lane highway with as little as 4-1/2 feet of cover. Geotechnical parameters, tunneling method selection, and construction methods are discussed. Ground response and monitoring are summarized.

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General Report Session No. 13: Case Histories Of New Solutions To Traditional Geotechnical Problems, Bruce L. Kutter, Ross W. Boulanger Jun 1993

General Report Session No. 13: Case Histories Of New Solutions To Traditional Geotechnical Problems, Bruce L. Kutter, Ross W. Boulanger

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Geotechnical Aspects On Seismic Risk Assessment In Cusco, Peru, M. A. Candia-Gallegos, K. F. Sprenke, J. C. Perez Jun 1993

Geotechnical Aspects On Seismic Risk Assessment In Cusco, Peru, M. A. Candia-Gallegos, K. F. Sprenke, J. C. Perez

International Conference on Case Histories in Geotechnical Engineering

Results from many efforts to better understand the nature of ground motions and the seismic behavior or structures in Cusco, Peru, give now the possibility to combine several sources of information to produce estimates of seismic hazard and risk. A model is presented which estimates expected damage, based on geotechnical characteristics and intensity-damage relations derived for several types of buildings representative of Cusco’s constructions. The study area was divided into smaller sections covering the whole city. This information, along with the geographic distribution of soil types and construction density, allows computation of expected losses during a given event for sites …

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Ground Movements In Mexico City During Recent Earthquakes, E. Ovando, M. P. Romo, L. Díaz Jun 1993

Ground Movements In Mexico City During Recent Earthquakes, E. Ovando, M. P. Romo, L. Díaz

International Conference on Case Histories in Geotechnical Engineering

Acceleration records were obtained with a rather dense accelerographic array during three recent earthquakes in Mexico City. Following a purely observational approach, useful information about the nature and characteristics of seismic motions was derived from the analysis of these records. Broad regional studies indicate that the distribution of seismic motions in the city may be affected by directivity effects. From local site studies it is concluded that seismic movements at the base of the compressible clay deposits are fairly uniform and accelerograms recorded in vertical arrays suggest that soil strata in Mexico City respond to seismic movements according to established …

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Liquefaction Risk Mitigation — Manchester Airport, J. M. Sobol, J. I. Baez, F. J. Swekosky Jun 1993

Liquefaction Risk Mitigation — Manchester Airport, J. M. Sobol, J. I. Baez, F. J. Swekosky

International Conference on Case Histories in Geotechnical Engineering

Densification of loose sandy soil by Vibroflotation was designed and constructed to mitigate the risk of seismically-induced liquefaction for the proposed 15,000 square meter terminal building. The analyses of the geotechnical data and the design of the densification based upon specified parameters is reported. Field installation methods and post-densification results are discussed.

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Preliminary Studies Of Ground Motions At Treasure Island And Yerba Buena Sites During The 1989 Loma Prieta Earthquake, W. D. Liam Finn, Guoxi Wu, Carlos E. Ventura Jun 1993

Preliminary Studies Of Ground Motions At Treasure Island And Yerba Buena Sites During The 1989 Loma Prieta Earthquake, W. D. Liam Finn, Guoxi Wu, Carlos E. Ventura

International Conference on Case Histories in Geotechnical Engineering

Site response analyses were conducted at the Treasure Island site where surface motions were recorded during the Loma Prieta earthquake. The analyses were conducted using a nonlinear dynamic effective stress method which took into account the effects of the liquefaction that occurred at the site. The rock motions recorded at nearby Yerba Buena Island were used as input motions. Computed and recorded ground motions transverse to the direction of wave propagation and associated response spectra were in good agreement. Agreement was also good in the radial direction, except in certain frequency bands higher than 1.25 Hz. Coherence studies showed that …

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Soil Liquefaction During The 1991 Telire-Limón, Costa Rica, Earthquake, Susumu Yasuda, Hiroyuki Watanabe, Nozomu Yoshida, Sergio Mora Jun 1993

Soil Liquefaction During The 1991 Telire-Limón, Costa Rica, Earthquake, Susumu Yasuda, Hiroyuki Watanabe, Nozomu Yoshida, Sergio Mora

International Conference on Case Histories in Geotechnical Engineering

The 1991 Telire-Limón Earthquake of magnitude 7.5 caused significant damage in Costa Rica and Panama. Soil liquefaction occurred widely in the low lying area in eastern Costa Rica, which caused severe damage to the embankment, bridges, and houses, etc. The liquefied sites are classified into three categories: 1) inland areas along rivers, 2) sand bars along beach, and 3) coastal areas along rivers. In inland area, road embankment of Route 32 was severely damaged due to liquefaction. Fissures parallel to the road and lateral spreading are occurred. At the sand bar and marsh, liquefaction occurred in the areas between the …

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Soil Response During The 1988 Armenia Earthquake, M. K. Yegian, V. G. Ghahraman, G. Gazetas Jun 1993

Soil Response During The 1988 Armenia Earthquake, M. K. Yegian, V. G. Ghahraman, G. Gazetas

International Conference on Case Histories in Geotechnical Engineering

Building damage statistics from the 1988 Armenia earthquake are presented and discussed. These statistics are correlated to the local soil profiles in the two major cities of Leninakan and Kirovakan. The soil amplification effects on building damage during this earthquake are investigated. One-dimensional site response analysis results and valley effects are presented to explain the extent and pattern of damage in the two cities.

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Some Aspects On The Falyum-Egypt Earthquake Of October 12, 1992, Mohamed A. El-Sohby, Mohamed A. Bahr, Mohamed H. Riyad Jun 1993

Some Aspects On The Falyum-Egypt Earthquake Of October 12, 1992, Mohamed A. El-Sohby, Mohamed A. Bahr, Mohamed H. Riyad

International Conference on Case Histories in Geotechnical Engineering

A moderate size earthquake shocked the southern west part of Cairo by 35km at 15:15 P.M. local time on October 12, 1992 causing wide spread devastation leading to loss of many lives and structure damages along the surrounding big cities. The paper describes the behavior of two identical residential buildings constructed on two different site soil conditions. The lesson learnt from the performance differences are highlighted, and some geotechnical and structural aspects are recorded.

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Analysis And Performance Of Raft And Raft-Pile Systems, I. K. Lee Jun 1993

Analysis And Performance Of Raft And Raft-Pile Systems, I. K. Lee

International Conference on Case Histories in Geotechnical Engineering

A brief review is made of the development of the analyses of structure-raft and structure-raft-pile systems. Examples are presented to illustrate the scope of present-day analyses. The applicability of the linear analysis is examined by comparing predicted and measured values of settlements, contact pressure and pile loads. Consideration is given to the influence of the soil constitutive model on predicted values.

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The Kettleman Hills Landfill Failure: A Retrospective View Of The Failure Investigations And Lessons Learned, James K. Mitchell, Mihsiung Chang, Raymond B. Seed Jun 1993

The Kettleman Hills Landfill Failure: A Retrospective View Of The Failure Investigations And Lessons Learned, James K. Mitchell, Mihsiung Chang, Raymond B. Seed

International Conference on Case Histories in Geotechnical Engineering

The sliding stability failure of the Kettleman Hills waste landfill focused attention on several issues related to the safe design and filling of waste repositories, including low strengths between geosynthetic material interfaces in composite liner systems and low interface strength between compacted clay and smooth geomembranes. Waste placement plans must be carefully developed to insure an adequate factor of safety against sliding at all stages of filling. Because of assumptions and uncertainties that remained following the initial failure investigation, model tests, at a scale of 1:150, were done. These tests reproduced the field failure very well and provided insights into …

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Man-Made Vibrations And Solutions, K. R. Massarsch Jun 1993

Man-Made Vibrations And Solutions, K. R. Massarsch

International Conference on Case Histories in Geotechnical Engineering

The generation and propagation of man-made vibrations in the ground is discussed. Emphasis is placed a simplified approach which is used to assess the most important factors, such as wave attenuation, refraction focusing and vibration amplification as a result of resonance. Practical guidelines are presented which can be used to predict vibrations and settlements in the ground. A semi-empirical relationship for the assessment of permissible vibration levels for buildings is proposed. Finally, a new ground vibration isolation method, the gas cushion screen is presented.

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Negative Skin Friction In Piles And Design Decisions, M. T. Davisson Jun 1993

Negative Skin Friction In Piles And Design Decisions, M. T. Davisson

International Conference on Case Histories in Geotechnical Engineering

Negative skin friction behavior of pile foundations is described for conditions of pile usage in the USA. Methods of determining downdrag load and pile resistance to downdrag are explained. Other factors entering into design are discussed such as pile load testing and analysis, pile structural strength, factors of safety, pile drivability, and reduction of downdrag loads. Observations from seven unpublished negative skin friction failures are used for illustration.

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Practical Studies Of The Seismic Response Of A Rockfill Dam And A Tailings Impoundment, W. D. Liam Finn Jun 1993

Practical Studies Of The Seismic Response Of A Rockfill Dam And A Tailings Impoundment, W. D. Liam Finn

International Conference on Case Histories in Geotechnical Engineering

Two case studies from engineering practice are presented to demonstrate how useful a sophisticated finite element analysis can be in providing a comprehensive understanding of how dams behave during earthquakes. The first example involves determining, from the recorded performance of a rockfill dam, the volume change characteristics of the rockfill which cannot be measured directly. The second example covers the full range of current capability for analysis. It involves dynamic effective stress analysis of a tailings dam to check the triggering of liquefaction and the analysis of post-liquefaction flow deformations.

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Discussions And Replies: State Of The Art Papers, Mohamad Hussein, Fred H. Held Iii, C. Mirza, T. M. Davisson Jun 1993

Discussions And Replies: State Of The Art Papers, Mohamad Hussein, Fred H. Held Iii, C. Mirza, T. M. Davisson

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Conference Snapshots, Multiple People Jun 1993

Conference Snapshots, Multiple People

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Conference Speakers, Multiple People Jun 1993

Conference Speakers, Multiple People

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Preliminary Design Guide For Cold-Formed Steel C- And Z-Members, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members Jun 1993

Preliminary Design Guide For Cold-Formed Steel C- And Z-Members, Committee On Specifications For The Design Of Cold-Formed Steel Structural Members

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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List Of Conference Participants, Multiple Participants Jun 1993

List Of Conference Participants, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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