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A General Method For Maximizing The Error-Detecting Ability Of Distributd Algorithms, Martina Schollmeyer, Bruce M. Mcmillin Jun 1993

A General Method For Maximizing The Error-Detecting Ability Of Distributd Algorithms, Martina Schollmeyer, Bruce M. Mcmillin

Computer Science Technical Reports

Error-detecting algorithms can determine when, at run time, a program deviates from its expected behavior due to a hardware, software or communication error. In a fixed interconnect multiprocessor system, the error detecting ability heavily depends on the number of faults, which is bounded, and their spatial distribution. Otherwise multiple fault occurrences can mask each other. This paper provides a general method for computing the overall system failure bound, the maximal fault index, from the system topology and local communication patterns. The result of the computation is used to design a mapping of processes to processor groups such that multiple processor …

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Field Trip Report: To View Effect Of An Earthquake That Happened Almost 200 Years Ago, David Stewart Jun 1993

Field Trip Report: To View Effect Of An Earthquake That Happened Almost 200 Years Ago, David Stewart

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Calibrated Dynamic Response Analysis Of Stafford Dam, L. H. Mejia, R. W. Boulanger Jun 1993

Calibrated Dynamic Response Analysis Of Stafford Dam, L. H. Mejia, R. W. Boulanger

International Conference on Case Histories in Geotechnical Engineering

Stafford Dam, an approximately 79-ft high compacted earthfill founded on stream alluvium approximately 40 feet thick, was shaken by the 1989 Lorna Prieta Earthquake. Records of the earthquake motions were obtained from seismographs located at the dam crest and at the right abutment on rock. Two-dimensional dynamic finite element analyses were performed to calibrate a model of the dam using the recorded motions. Excellent agreement between the recorded and calculated response was obtained by appropriate adjustments to material parameters based on shear wave velocity measurements. Various deconvolution methods for obtaining input bedrock motions to calculate the dam response are discussed.

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Seismic Failure Of Barahona Tailings Dam, J. H. Troncoso, A. Vergara, A. Avendaño Jun 1993

Seismic Failure Of Barahona Tailings Dam, J. H. Troncoso, A. Vergara, A. Avendaño

International Conference on Case Histories in Geotechnical Engineering

The seismic failure of Barahona Tailings Dam has been analyzed. Causes of failure were decrease of the shear strength of the slimes and large displacements and breaching of the sand dikes. The dikes were partially founded on the unconsolidated slimes because the dam was built by the upstream method. Liquefied tailings flowed violently down the courses of Barahona creek and Cachapoal River causing heavy destruction over a 50 km long path. It is concluded that the upstream method of construction of tailings dams should not be encouraged in seismic zones; however, it could be considered as an alternative solution, provided …

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Failures Of Quay Walls During Chilean Earthquake Of March 1985, P. Ortigosa, E. Retamal, R. V. Whitman Jun 1993

Failures Of Quay Walls During Chilean Earthquake Of March 1985, P. Ortigosa, E. Retamal, R. V. Whitman

International Conference on Case Histories in Geotechnical Engineering

Extensive damage took place in the quay walls in the Ports of Valparaíso and San Antonio during the Chilean earthquake of March 1985. Different types of retaining structures such as gravity retaining walls built with concrete blocks, sheetpiles and decks on vertical piles were subjected to large shaking ranging from 0.3 - 0.45g at Valparaíso Port to more than 0.6g at San Antonio. Some of the retaining structures collapsed and others behave quite well. In addition, some liquefaction and settlements in the sandy fill below the yards did occur at San Antonio, along with permanent displacements in the fill slope …

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Analyzing Man-Made Vibrations, Diagnostics And Monitoring, M. R. Svinkin Jun 1993

Analyzing Man-Made Vibrations, Diagnostics And Monitoring, M. R. Svinkin

International Conference on Case Histories in Geotechnical Engineering

Machine foundation and construction vibrations ate main industrial man-made vibrating sources. Eight presented case histories are divided on two groups: machine foundation oscillations and seismic effect of man-made vibrations. There is the attempt in this paper to suggest a guideline for determination the causes of arisen perceptible machine foundation vibrations. Some case histories are described shortly using the following set-up: arisen problem, field investigation and measurements, the suggested solution, the performance, and final results. Others case histories are elaborated in details.

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Construction Of Pedestrian Tunnels, Essex Junction, Vt, B. F. Townsend, A. D. Walker Jun 1993

Construction Of Pedestrian Tunnels, Essex Junction, Vt, B. F. Townsend, A. D. Walker

International Conference on Case Histories in Geotechnical Engineering

A combination of innovative tunnel engineering concepts and ground improvement technologies are described as applied to an IBM facility in Vermont, with emphasis on the geotechnical aspects of the construction. By this approach, emergency access and egress tunnels were built through difficult soils beneath the slab on grade of a vibration sensitive manufacturing building, with minimal disruption to daily operations.

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General Report Session No. 6: Case Histories Of Geotechnical Engineering And Rock Engineering, Charles J. Haas Jun 1993

General Report Session No. 6: Case Histories Of Geotechnical Engineering And Rock Engineering, Charles J. Haas

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Soft Clay Ground Improvement Of Ningbo International Airport, X. R. Zhu, Q. Y. Pan, K. H. Xie Jun 1993

Soft Clay Ground Improvement Of Ningbo International Airport, X. R. Zhu, Q. Y. Pan, K. H. Xie

International Conference on Case Histories in Geotechnical Engineering

Ningbo International Airport is built on the soft clay ground first in China. It has a runway 3,000m in length and 45m in width. The thickness of soft clay is greater than 32m. The calculating consolidation settlement is 0. 48m, far beyond to allowable limit. The soft clay ground is improved by wick drain and surcharge precompression. The airport has been put in service since July, 1990. The process and the results of a full scale embankment test, the ground improvement and the settlement observation are described. The influence of the smear and the well resistance of the wick drain …

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Field Measurements Of A Diaphragm Wall Foundation, T. Matsui, H. Nakajima, T. Nagano, T. Hosoi, Y. Fukuda, K. Hayashi Jun 1993

Field Measurements Of A Diaphragm Wall Foundation, T. Matsui, H. Nakajima, T. Nagano, T. Hosoi, Y. Fukuda, K. Hayashi

International Conference on Case Histories in Geotechnical Engineering

Field measurements of a small-sectioned diaphragm wall foundation for a highway bridge have been performed to understand the stability of the trench wall during construction. In this paper, a case history on the field measurements of the diaphragm wall foundation during deep trench excavation is presented.

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Soil Improvements Of An Inhomogeneous Reclaimed Ground, Sasumu Yasuda, Hiroshi Suzuki, Hideotoshi Takemoto, Kohi Hayashi, Kazuo Saito, Naomi Ine Jun 1993

Soil Improvements Of An Inhomogeneous Reclaimed Ground, Sasumu Yasuda, Hiroshi Suzuki, Hideotoshi Takemoto, Kohi Hayashi, Kazuo Saito, Naomi Ine

International Conference on Case Histories in Geotechnical Engineering

A coal storage yard for an electric power plant was to be constructed on reclaimed land in northern Japan. As the reclaimed land consisted of loose sand and soft silt, a deep well excavation method, a dynamic compaction method and a sand compaction method were selected to improve clayey grounds, sandy grounds and intermediate grounds, respectively. After the improvement, no obvious settlement and no liquefaction has been induced.

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Session 10, 11, 12 − Opening Remarks, Shiming Wu Jun 1993

Session 10, 11, 12 − Opening Remarks, Shiming Wu

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Case History Of Aquifer Thermal Energy Storage (Ates), C. Mirza Jun 1993

Case History Of Aquifer Thermal Energy Storage (Ates), C. Mirza

International Conference on Case Histories in Geotechnical Engineering

Aquifer Thermal Energy storage (ATES) is a relatively new energy conserving technology which enables subsurface seasonal storage of freely available cold of winters and heat of summers for re-use in the opposite season. Thermal energy is stored in aquifers, groundwater serving as the medium of energy transfer. This case history describes an ATES installation for an office building in Ontario. Groundwater from a 10 m thick sandy aquifer at the 60 m depth is pumped from one pair of wells and re-injected, after extraction or addition of heat, into an opposing pair of wells. ATES technology not only conserves non-renewable …

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Foundation Problems At A Residential Complex – A Case History, U. N. Sinha Jun 1993

Foundation Problems At A Residential Complex – A Case History, U. N. Sinha

International Conference on Case Histories in Geotechnical Engineering

The paper describes a case history in connection with foundation problems at a residential complex on the adequacy or otherwise of the bearing capacity of foundation soil for raising the existing buildings to double storeyed configuration. The study made possible to raise few existing buildings to double storeyed where safe bearing capacity was found adequate and these buildings could reveal good performance since implementation of suggestions.

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Vibrations Due To Pile Driving, M. R. Lewis, J. R. Davie Jun 1993

Vibrations Due To Pile Driving, M. R. Lewis, J. R. Davie

International Conference on Case Histories in Geotechnical Engineering

Vibrations due to pile installation have long been a concern to owners, contractors, and engineers. Specifically, what levels of vibrations can be assumed for a given pile, hammer, and subsurface conditions and how can these levels be predicted in advance of construction so an assessment of nearby structures can be made? This paper presents the results of vibration monitoring at several sites where various piles and pile hammers have been used, and recommends a conservative method of predicting peak particle velocity at the ground surface near pile installations. Where sensitive structures are involved, a response spectrum analysis is recommended.

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General Report On Session No. 5: Case Histories Of Retaining Structures And Deep Excavations, John T. Christian, Çetin Soydemir, Alan J. Lutenegger Jun 1993

General Report On Session No. 5: Case Histories Of Retaining Structures And Deep Excavations, John T. Christian, Çetin Soydemir, Alan J. Lutenegger

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Westhazel General Petroleums Pool: Case History Of A Salt- Dissolution Trap In West-Central Saskatchewan, Canada, Neil Lennart Anderson, Dale A. Cederwall Jun 1993

Westhazel General Petroleums Pool: Case History Of A Salt- Dissolution Trap In West-Central Saskatchewan, Canada, Neil Lennart Anderson, Dale A. Cederwall

Geosciences and Geological and Petroleum Engineering Faculty Research & Creative Works

The Westhazel General Petroleums (GP) Pool of west-central Saskatchewan, Canada, produces from the GP member of the Lower Cretaceous Mannville Group. This reservoir is structurally closed across the updip, eastern dissolutional edge of the underlying Middle Devonian rock salt of the Leofnard Member, Prairie Formation. The leaching of these salts occurred in post-Mannville time in the Westhazel area and caused the regional southwest dip of the General Petroleums member to be locally reversed.The Westhazel GP Pool, from a geophysical perspective, is characteristic of many of the shallow Lower Cretaceous pools situated along the dissolutional edge of the Prairie salt. The …

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Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors Jun 1993

Past Proceedings: Second International Conference On Case Histories In Geotechnical Engineering (1988), Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Case Histories Of Pile Foundations In Bombay Region, K. R. Datye, J. R. Patil Jun 1993

Case Histories Of Pile Foundations In Bombay Region, K. R. Datye, J. R. Patil

International Conference on Case Histories in Geotechnical Engineering

Piles in Bombay region are bored cast-in-situ installed by bailor and chisel boring or direct mud circulation with drop chisels. In weak and weathered rock interpretation of core drilling, SPT, CPT, pressuremeter tests are subject to several limitations, hence design parameters based on conventional soil investigation methods are subject to uncertainties. The past practice has been empirical and the designers relied mainly on load tests and failures have occurred in areas subject to considerable variation in rock characteristics and large depth of soft clay overburden. Recently improvements in investigation and design methodology have been introduced based on postulated relations of …

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The Agua Prieta Powerhouse Slope Instability, F. Gonzalez-Valencia, S. Herrera-Castañeda Jun 1993

The Agua Prieta Powerhouse Slope Instability, F. Gonzalez-Valencia, S. Herrera-Castañeda

International Conference on Case Histories in Geotechnical Engineering

The slope instability that endangered seriously the powerhouse of the Aqua Prieta Hydroelectric Project and involved about one million cubic meters of soils and breccias is described. The evolution of the geotechnical instrumentation measurements done from October 1987 to date, the geomechanic analysis performed and the stabilization works are discussed.

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Combined Isolation Foundation By Elastic Base Plate And Ground Barriers, Guang-Yun Gao, Xian-Jian Yang Jun 1993

Combined Isolation Foundation By Elastic Base Plate And Ground Barriers, Guang-Yun Gao, Xian-Jian Yang

International Conference on Case Histories in Geotechnical Engineering

A high sensitive and large semi-anechoic chamber, designed by a new system of isolation is reported in this paper. The combined isolation of a large size elastic plate on sand cushion and pile barriers was used in this system. By properly designing the stiffness of elastic base plate, the amplitude of the anechoic chamber floor under the action of dynamic toad of testing vehicle can be controlled within the allowed range of accuracy. This new system has been conformed with the disturbance of outside of vibration on anechoic chamber (passive vibration isolation) and with that of vehicle testing inside the …

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Braced Excavation At The Nipsco Bailly Station Power Plant, J. D. Bray, R. J. Deschamps, Ad. J. Augello, R. S. Parkison Jun 1993

Braced Excavation At The Nipsco Bailly Station Power Plant, J. D. Bray, R. J. Deschamps, Ad. J. Augello, R. S. Parkison

International Conference on Case Histories in Geotechnical Engineering

In July 1991, the intake and discharge pipelines of a major power plant collapsed. A 60-ft. deep excavation adjacent to several structures sensitive to ground movements was required- for remediation. Based on conventional analyses, the estimated factor of safety against base heave was close to 1. 0 for the required excavation, and there was grave concern for damage to appurtenant structures. A viable reconstruction scheme was developed through the integration of finite element analyses and construction monitoring.

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A Case History Of The Collapse Accident Of A Temporary Earth Support Structure, Noriyuki Horii, Shigeo Hanayasu, Yasuo Toyosawa, Satoshi Tamate, Takakazu Maruyasu Jun 1993

A Case History Of The Collapse Accident Of A Temporary Earth Support Structure, Noriyuki Horii, Shigeo Hanayasu, Yasuo Toyosawa, Satoshi Tamate, Takakazu Maruyasu

International Conference on Case Histories in Geotechnical Engineering

This paper presents a case study on the collapse accident of a temporary earth support structure. The examination of the design plans and investigations of the construction site where the accident occurred bas been carried out to throw light on the accident situations. Some causes of the accident occurrence which have been derived from these examinations and countermeasures for prevention of these types of accidents are discussed.

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Discussions And Replies Session 2, Wu Yingwoei, B. B. K. Huat, Ming-Hung Chen, Wade E. Cooper, Ioan Stanculescu, Anton Chirica, Pedro S. Sêco E Pinto Jun 1993

Discussions And Replies Session 2, Wu Yingwoei, B. B. K. Huat, Ming-Hung Chen, Wade E. Cooper, Ioan Stanculescu, Anton Chirica, Pedro S. Sêco E Pinto

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Investigation Of Hole Caving Due To Vibrations, W. N. Houston, S. L. Houston, K. D. Walsh Jun 1993

Investigation Of Hole Caving Due To Vibrations, W. N. Houston, S. L. Houston, K. D. Walsh

International Conference on Case Histories in Geotechnical Engineering

Foundations for a power plant were constructed by drilling holes in cemented sand for 36" piers. The boreholes in the cemented sand did not cave. A major design change required the demolition of the original piers and pile caps with large hoe rams and the drilling of new 36" boreholes in the same location. The new drilling contractor experienced widespread caving, which he was unable to remedy. The authors first investigated the possibility that the second contractor used inferior equipment or techniques. Then the authors investigated the possibility that a loss in soil cohesion occurred due to the vibrations from …

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Structural And Functional Distress Due To Slag Expansion, E. M. Morales Jun 1993

Structural And Functional Distress Due To Slag Expansion, E. M. Morales

International Conference on Case Histories in Geotechnical Engineering

Cracking and heaving of a Single Storey R.C. Building was initially perceived as settlement. This error led to unnecessary and costly remedial measures such as Piling for the Phase ll Building which further aggravated the problem. The heaving was caused by a seemingly innocent decision during the construction stage to use Slag from a steel mill as the base course material. This Slag reacted with the highly corrosive groundwater which caused heaving of the Building and discomfort and morale problems to the Building occupants. Careful engineering study and investigation resulted in a very simple solution which saved the Building from …

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Soil Remediation Via Environmentally Processed Asphalt (Epa), S. M. Testa, D. L. Patton Jun 1993

Soil Remediation Via Environmentally Processed Asphalt (Epa), S. M. Testa, D. L. Patton

International Conference on Case Histories in Geotechnical Engineering

Several methodologies are available for the remediation of contaminated soils including bioremediation, vapor extraction, chemical fixation, incineration and direct disposal. A proven innovative and cost effective alternative for the fixation of contaminated soils is via cold-mix Environmentally Processed Asphalt (EPA). EPA methodology utilizes contaminated soil as an ingredient in an industrial process to produce a commercially viable product. Petroleum hydrocarbon and metal affected soil is incorporated with an asphalt emulsion and aggregate to produce a range of cold-mix asphalt product that fulfills the requirements of a variety of end uses. This viable and creative use which is within the intent …

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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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Authors And Discussors Index, Multiple Authors Jun 1993

Authors And Discussors Index, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Meet Our Authors, Multiple Authors Jun 1993

Meet Our Authors, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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