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Geotechnical Engineering

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Articles 3271 - 3300 of 4582

Full-Text Articles in Engineering

Pressure Relief Tunnel System At Us22/Sr7 Interchange, Oh, J. R. Graham, R. W. Humphries, J. M. Fuller, G. M. Elliott Jun 1993

Pressure Relief Tunnel System At Us22/Sr7 Interchange, Oh, J. R. Graham, R. W. Humphries, J. M. Fuller, G. M. Elliott

International Conference on Case Histories in Geotechnical Engineering

Construction of the US22/SR7 interchange in Steubenville, OH resulted in the need to excavate the toe of the steep 350 ft. high slope overlooking the Ohio River. To maintain the stability of the slope, the Ohio Department of Transportation (ODOT) chose to construct a 4 tier, 130- ft. high, 2,200 ft. long tieback anchor retaining wall. During the design phase, it became apparent that reductions in both the tieback loading and cost could be realized by lowering the groundwater levels in the hillside. A Pressure Relief Tunnel System (PRTS) was selected from several drainage options. The PRTS consists of a …

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Studies On A 4.0m High Reinforced Earth Wall, Swami Saran, I. N. Khan Jun 1993

Studies On A 4.0m High Reinforced Earth Wall, Swami Saran, I. N. Khan

International Conference on Case Histories in Geotechnical Engineering

In this paper studies carried out on an instrumented 4. 0 m high reinforced earth wall have been described. The shape of potential failure surface was found bi-linear. Stability analysis based on computation using classical Renkine's theory was found applicable.

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Cavern Wall Support Requirements In A Hydro-Electric Project, Manoj Verman, J. L. Jethwa, R. K. Goel Jun 1993

Cavern Wall Support Requirements In A Hydro-Electric Project, Manoj Verman, J. L. Jethwa, R. K. Goel

International Conference on Case Histories in Geotechnical Engineering

Construction of a 23m wide, 57m high, and 210m long underground power house cavern is in progress as a part of the multi-purpose Sardar Sarovar Project in India. The rock mass around the cavern is basalt which is intruded by a number of dolerite dykes. In view of the high side walls of the cavern, and the presence of a 1 to 2m thick shear zone running across the cavern width, a comprehensive approach was worked out for estimation of the wall support requirements. The approach included estimation of the roof support requirements using the four available approaches, and comparison …

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Impact Of Environmental Conditions On A Structural Damage, M. A. El-Sohby, M. A. Bahr Jun 1993

Impact Of Environmental Conditions On A Structural Damage, M. A. El-Sohby, M. A. Bahr

International Conference on Case Histories in Geotechnical Engineering

This paper deals with a case history of a structural damage of college buildings lie in a nearly developed area at the north-east of Cairo. The building behavior and the factors cause the damage arc contributed. As a result, the light on the importance of topographical condition of the site is sighted and recommended for such similar cases.

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Preloading Wastewater Treatment Plant Tanks, K. Lowery, A. N. Wagh, J. B. Falcon Jun 1993

Preloading Wastewater Treatment Plant Tanks, K. Lowery, A. N. Wagh, J. B. Falcon

International Conference on Case Histories in Geotechnical Engineering

Storage tanks for a wastewater treatment plant were stage-loaded on weak compressible fine-grained soils. The in situ silt and sand layers/pockets present in the fine-grained soils were theorized to create sufficient drainage paths, so that the use of sand or wick drains were not required. Although the silt and sand layers/pockets were found to be discontinuous, "hydraulic fracturing" was expected to develop continuous drainage paths. A review of the extensive field investigation and geotechnical optimization of the site is presented. Details for the evaluation of the shear strength of the soils, the stage loading schedule and predicted settlements during loading …

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Surcharging Of Organic Silt Using Prefabricated Vertical Drains, T. H. Bedenis Jun 1993

Surcharging Of Organic Silt Using Prefabricated Vertical Drains, T. H. Bedenis

International Conference on Case Histories in Geotechnical Engineering

A new Combined Sewage Overflow (CSO) basin was constructed in Saginaw, Michigan. The project required an 8.5 foot (2.6 m) diameter connecting sewer to be constructed under a 12 foot (3.7 m) high stockpile of spoil from the excavation for basin. The soil profile at the site contained a 32 foot (9 .8 m) thick layer of compressible organic silt. Since the weight of the stockpile was anticipated to cause settlement of the sewer, a surcharge was placed to preconsolidate the organic silt prior to construction of the sewer. Analysis indicated prefabricated vertical (PV) drains would be required to achieve …

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Foundation Soil Preparation For Landfills In Karst Terrain, Kou-Roung Chang, John Carter Jun 1993

Foundation Soil Preparation For Landfills In Karst Terrain, Kou-Roung Chang, John Carter

International Conference on Case Histories in Geotechnical Engineering

Stabilizing sand-filled solution chimneys in karst terrain for the construction of sanitary landfills is challenging for geotechnical engineers. A ground water contamination assessment conducted at a sanitary landfill in north central Florida indicated that landfill leachate was contaminating the Floridian Aquifer. To expand the landfill, the Florida Department of Environmental Regulation (FDER) required that a liner system be constructed and that stringent landfill subgrade preparation be performed to minimize the potential for sinkhole formation and subsequent damage to the liner system. To meet the requirements, the following foundation soil preparations were performed: (1) prerolling the subgrade with vibratory rollers, (2) …

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Instrumented Caissons At The Ibm Building, Baltimore, S. Kesavanathan, D. W. Kozera Jun 1993

Instrumented Caissons At The Ibm Building, Baltimore, S. Kesavanathan, D. W. Kozera

International Conference on Case Histories in Geotechnical Engineering

Two of the caissons supporting the 26-story IBM office building were instrumented to evaluate the load transfer mechanism from caissons to the surrounding soil and rock. These drilled shafts extended through loose alluvial stratum, a stratum of dense sands and silts, a disintegrated rock stratum, and were founded in the underlying Amphibolite bedrock. Evaluation of mobilized skin friction and end bearing for one of the caissons are presented in this study. Instrumentation consisted of vibrating wire total load cells and embedded strain gauges. Total load cells were installed at the bottom of the caissons to measure the end bearing pressure. …

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Behavior Of Direct Tower Foundation On Improved Soil, F. Colleselli, P. Varagnolo Jun 1993

Behavior Of Direct Tower Foundation On Improved Soil, F. Colleselli, P. Varagnolo

International Conference on Case Histories in Geotechnical Engineering

The paper presents the foundation behaviour of a 146-m telecommunications tower situated near Verona in Italy, with foundation soils characterized as a thick deposit of alluvial gravels and sands. In order to limit total and differential settlements of the tower it was decided to improve the foundation soil with jet-grouting columns. Predictions on the behaviour of the structure and the foundation soil were performed with an axisymmetric finite-element model adopting an elastic linear constitutive law. Soil moduli were obtained from the results of a cross-hole test and from Standard Penetration Tests; jet-grouting columns behaviour was estimated from load and borehole …

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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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The Impact Of Rising Ground Water Level On The Geotechnical Behavior Of Soil In Hot Climate Regions, A. S. Stipho Jun 1993

The Impact Of Rising Ground Water Level On The Geotechnical Behavior Of Soil In Hot Climate Regions, A. S. Stipho

International Conference on Case Histories in Geotechnical Engineering

The continuous development and industrial changes in Saudi Arabia necessitates large ground water exploitation and brought about significant changes to the ground water regime. The alarming evidence of rising shallow ground water level and the widespread structural problems have mitigate the extra demand to develop special geotechnical awareness, standard testing and designing procedures to minimize the impact of wetting on soil behavior in the hot climate region. Field and laboratory test results on typical soil samples have established the influence of rising moisture and exemplified the adverse levels of collapse manifested by the large reduction in shearing strength and the …

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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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Modified Cover System For Hazardous Waste Landfills In Semi-Arid Areas, S. Dutta Jun 1993

Modified Cover System For Hazardous Waste Landfills In Semi-Arid Areas, S. Dutta

International Conference on Case Histories in Geotechnical Engineering

Flawless installation of conventional clay cover system in semi-arid areas is almost an impossibility. Cracks and microfractures in clay cover system leading to high seepage and plume migration has been experienced by many landfills in semi-arid areas. A modified cover system developed by the author at Tinker Air Force Base, Oklahoma is designed to overcome the leakage effect by using manufactured clay liners in combination with a thin cushion of clay layer. Another major disadvantage of the conventional clay cover system is the mounding effect of the cover system and the resulting capture and conversion of the contiguous clean and …

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Damage Patterns/Response Of Deep Stiff Clay In Oakland, Joseph I. Sun, Susan W. Chang, Jonathan D. Bray, Lelio H. Mejia Jun 1993

Damage Patterns/Response Of Deep Stiff Clay In Oakland, Joseph I. Sun, Susan W. Chang, Jonathan D. Bray, Lelio H. Mejia

International Conference on Case Histories in Geotechnical Engineering

The 1985 Mexico City earthquake and the 1989 Loma Prieta earthquake provided well-documented evidence of the effect of local ground conditions on site response and damage patterns. Deep soft clay deposits, in particular, were often cited as the "culprit" of amplified ground motions. However, during the 1989 Loma Prieta earthquake, ground accelerations in the downtown Oakland area were amplified by a factor of two to four and a significant number of structures were heavily damaged, despite the fact that much of the area is underlain by deposits of deep stiff clay. A preliminary review of damage patterns in the Oakland …

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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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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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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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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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Seismic Response Of The Pile Foundation Of Ohba-Ohashi Bridge, George Gazetas, Takashi Tazoh, Katsumi Shimizu, Ke Fan Jun 1993

Seismic Response Of The Pile Foundation Of Ohba-Ohashi Bridge, George Gazetas, Takashi Tazoh, Katsumi Shimizu, Ke Fan

International Conference on Case Histories in Geotechnical Engineering

The paper outlines the recorded response to numerous earthquakes of the pile foundation, the supporting soil, and the superstructure of the main pier of a road bridge. The records include free-field accelerograms at the ground surface and the base of the alluvial deposit, accelerograms on the footing and the superstructure, and the bending and axial strain histories at several depths along two of the sixty-four piles. Recently developed methods of seismic analysis are used in interpreting the recorded data. Extensive comparisons are made between theory and measurements. Successes and failures of the theory are discussed. Emphasis is given to the …

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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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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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Steering Committee; Organizing Committee; Paper Review Committee, Multiple Members Jun 1993

Steering Committee; Organizing Committee; Paper Review Committee, Multiple Members

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Disclaimer And Preface - Vol. Iii, Shamsher Prakash Jun 1993

Disclaimer And Preface - Vol. Iii, Shamsher Prakash

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Disclaimer And Preface - Vol. I, Shamsher Prakash Jun 1993

Disclaimer And Preface - Vol. I, Shamsher Prakash

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Disclaimer And Preface - Vol. Ii, Shamsher Prakash Jun 1993

Disclaimer And Preface - Vol. Ii, Shamsher Prakash

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Table Of Contents - Vol. Iii, Multiple Authors Jun 1993

Table Of Contents - Vol. Iii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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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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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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Case History Of A Bridge Foundation, T. Z. Rao Jun 1993

Case History Of A Bridge Foundation, T. Z. Rao

International Conference on Case Histories in Geotechnical Engineering

A reinforcement open caisson of a bridge was constructed on a sand island. Its constructing characteristic couldn't been foreseen and were calculated conventionally. Besides, there were some mistaken methods in the constructing. Therefore the open caisson broke up to become 4 blocks in the construction. The largest width in these cracks was 80 cm. Investigation and analysis having been done, the causes of the failure were found. Some repairing methods, such as opposite cutting edge, reinforcement hoop, and so on, adopted. Correct excavation was carried out. The open caisson finally sunk to the rock. The treatment was successful.

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Discussions And Replies Session 1, T. P. Smith, Y. Iwasaki, D. Sielbach, C. Mirza Jun 1993

Discussions And Replies Session 1, T. P. Smith, Y. Iwasaki, D. Sielbach, C. Mirza

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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