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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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Case Histories Of Compacted Clay Liners And Covers For Waste Disposal Facilities, David E. Daniel Jun 1993

Case Histories Of Compacted Clay Liners And Covers For Waste Disposal Facilities, David E. Daniel

International Conference on Case Histories in Geotechnical Engineering

Compacted clay liners and covers are widely used in waste containment units. Case histories in three categories are presented: (1) case histories illustrating compaction, construction, and quality assurance difficulties; (2) case histories involving field hydraulic conductivity testing of large-scale test pads; and (3) case histories involving final cover systems. The case histories illustrate that: (1) compaction criteria should be chosen carefully and with consideration given to how the compaction will be controlled in the field; (2) regulatory roadblocks may defeat sound technical approaches in terms of developing compaction criteria; (3) one can follow ASTM procedures and still get into difficulty …

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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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Geotechnical Problems Encountered During The Excavation Of Underground Cavities For Varahi Hydro Electric Project, H. V. Eswaraiah, V. S. Upadhyaya, B. N. Vishwanath Jun 1993

Geotechnical Problems Encountered During The Excavation Of Underground Cavities For Varahi Hydro Electric Project, H. V. Eswaraiah, V. S. Upadhyaya, B. N. Vishwanath

International Conference on Case Histories in Geotechnical Engineering

Varahi river in Karnataka State, India originates on the Western Ghats and is harnessed for power generation by constructing three dams. The water is conveyed through two inclined pressure shaft to the underground power house below the Ghats. The underground power house of the Varahi Hydro Electric Project executed by the Karnataka Power Corporation has 2 units of 135 MW each in the first stage with a provision to add two more identical units. Three underground cavities are excavated parallel to one another for housing the rotary valves, generators and the transformers respectively and are at a gee-static head of …

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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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Behavior Of Laterally Loaded Drilled Shafts In Stiff Soil, A. J. Lutenegger, G. A. Miller Jun 1993

Behavior Of Laterally Loaded Drilled Shafts In Stiff Soil, A. J. Lutenegger, G. A. Miller

International Conference on Case Histories in Geotechnical Engineering

Results of lateral load tests on four drilled shafts installed in stiff cohesive soil are presented. Predictions of the load/displacement behavior were made using p-y curves generated from the results of Prebored Pressuremeter and Dilatometer Tests. A new method to develop p-y curves from the DMT is presented and discussed.

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Case Histories Of Bored Pile Foundations, T. Z. Rao Jun 1993

Case Histories Of Bored Pile Foundations, T. Z. Rao

International Conference on Case Histories in Geotechnical Engineering

A kind of bored pile with large diameter is being used in civil engineering in China. The maximum length in earth of the pile is greater than 100 m. This pile may be built in rock. In the paper, the constructing methods of the bored pile foundation of a bridge and a grade separation are described. Relating the result with its cause, the failure of the bored pile in construction, the cause of the failure and the treatment methods are related.

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Case History Of Foundation Design For 50000 M3 Oil Tank, Hai-Chen Hsu Jun 1993

Case History Of Foundation Design For 50000 M3 Oil Tank, Hai-Chen Hsu

International Conference on Case Histories in Geotechnical Engineering

This paper introduces the case history of foundation design for 50000 m3 oil tank in collapsible loess region. After field deep blasting test and laboratory soil test, author design deep Explosion-Squeeze-Foundation under the foundations of two oil tanks in a refinery for refining 5 million tons of crude oil per year. Diameter of E.S.F. :D1=66.43m; thickness of E.S.F.: H1=12m. It was the largest engineering practice in collapsible loess region in China in 1979 that deep foundation of 50000 cubic meter oil tanks are built by explosion squeeze technique first time.

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Damage Of A Broadcasting Station Due To Shrinkage Of Soil, M. A. El-Sohby, A. M. Elleboudy Jun 1993

Damage Of A Broadcasting Station Due To Shrinkage Of Soil, M. A. El-Sohby, A. M. Elleboudy

International Conference on Case Histories in Geotechnical Engineering

This paper discusses the causes of damage of a broadcasting transmission station suffered from settlement cracks. The station buildings were low-rise reinforced concrete structures with isolated footings founded on alluvial deposit. Investigations revealed that the main causes of the observed nonuniform settlement were the existence of silt pockets below some footings, and the shrinkage of clayey soils due to dryness of the subsoil after ceasing the cultivation of land and using it as construction site. Rehabilitation scheme included structural repair of the cracked columns, beams and walls, and injection grouting of the foundation soil beneath the settled columns.

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Failure Of A Shipping Berth, Dinesh Mohan Jun 1993

Failure Of A Shipping Berth, Dinesh Mohan

International Conference on Case Histories in Geotechnical Engineering

A Major port in India had six cargo berths and a seventh one was to be added to cater for the heavy cargo traffic. The top layer of the soil along the berth was 20 m thick soft and sensitive marine silty clay with an average shear strength of 2 tons/Sqm. The design provided for a berth 342 m long. It had a quay and transit area supported on 750 mm diameter bored piles which was followed by open stacking ground 60 m wide, to be preconsolidated by sand drains. Finally it had a paved unconsolidated area 120 m wide. …

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Friction Pile Foundations Subject To Regional Subsidence, A. Rico, J. M. Orozco, J. L. León Jun 1993

Friction Pile Foundations Subject To Regional Subsidence, A. Rico, J. M. Orozco, J. L. León

International Conference on Case Histories in Geotechnical Engineering

A load mechanism and its associated displacements for friction piles driven in a soil subject to regional subsidence is presented. The effect of a surficial crust, which is not under consolidation, is analyzed and to avoid pile emersion, a boundary for the piles safety factor is established. Foundations supported on friction piles, where the foundation slab should always be in contact with the supporting soil, is also analyzed. It is proposed to consider that the load transmitted by the foundation slab be equal to the excavated weight and it is suggested that the increase pile-soil adherence with time, should be …

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Successful Design Of Expansive-Soil Foundation For A Large Modern Chemical Fertilizer Plant, H. B. Qian Jun 1993

Successful Design Of Expansive-Soil Foundation For A Large Modern Chemical Fertilizer Plant, H. B. Qian

International Conference on Case Histories in Geotechnical Engineering

Various methods of foundation treatment had been adopted in the design of different parts of the plant according to its particular needs respectively. The adopted methods include: selecting rational depth of foundation; increasing pressure on the base of foundation; replacement of soils; sand mat; pier foundation and large diameter cast-in-place piles. In addition to the foundation treatments, measures were also taken to prevent the infiltration of water and to protect the moisture of sub-soils. The super-structure were also designed to have a greater rigidity.

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Deformation Prediction For An Underground Opening, Yang Zhifa, Du Yonglian, Wang Sijing, Ji Liang Jie Jun 1993

Deformation Prediction For An Underground Opening, Yang Zhifa, Du Yonglian, Wang Sijing, Ji Liang Jie

International Conference on Case Histories in Geotechnical Engineering

For excavation of a large underground opening, how to predict the deformation caused by excavation is a subject of interest to the engineers. In this paper, the main underground opening of Lubuge Hydroelectric Power Station will be cited to explain the method predicting its deformation. The successful application shows that the method called MDBD could, perhaps, be used for deformation prediction of other large underground excavations if they satisfy some special conditions basically.

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