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Articles 15421 - 15450 of 21740
Full-Text Articles in Engineering
The Impact Of Rising Ground Water Level On The Geotechnical Behavior Of Soil In Hot Climate Regions, A. S. Stipho
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 …
Drilled Pier Load Capacity Of Detroit Area Hardpan Using An Overberg Load Cell, L. P. Jedele, T. H. Bedenis
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.
Modified Cover System For Hazardous Waste Landfills In Semi-Arid Areas, S. Dutta
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 …
Damage Patterns/Response Of Deep Stiff Clay In Oakland, Joseph I. Sun, Susan W. Chang, Jonathan D. Bray, Lelio H. Mejia
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 …
Geotechnical Aspects On Seismic Risk Assessment In Cusco, Peru, M. A. Candia-Gallegos, K. F. Sprenke, J. C. Perez
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 …
Liquefaction Risk Mitigation — Manchester Airport, J. M. Sobol, J. I. Baez, F. J. Swekosky
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.
Soil Response During The 1988 Armenia Earthquake, M. K. Yegian, V. G. Ghahraman, G. Gazetas
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.
Negative Skin Friction In Piles And Design Decisions, M. T. Davisson
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.
Seismic Response Of The Pile Foundation Of Ohba-Ohashi Bridge, George Gazetas, Takashi Tazoh, Katsumi Shimizu, Ke Fan
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 …
Conference Snapshots, Multiple People
Conference Snapshots, Multiple People
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Authors And Discussors Index, Multiple Authors
Authors And Discussors Index, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Steering Committee; Organizing Committee; Paper Review Committee, Multiple Members
Steering Committee; Organizing Committee; Paper Review Committee, Multiple Members
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Disclaimer And Preface - Vol. Iii, Shamsher Prakash
Disclaimer And Preface - Vol. Iii, Shamsher Prakash
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Disclaimer And Preface - Vol. I, Shamsher Prakash
Disclaimer And Preface - Vol. I, Shamsher Prakash
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Disclaimer And Preface - Vol. Ii, Shamsher Prakash
Disclaimer And Preface - Vol. Ii, Shamsher Prakash
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Table Of Contents - Vol. Iii, Multiple Authors
Table Of Contents - Vol. Iii, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Field Trip Report: To View Effect Of An Earthquake That Happened Almost 200 Years Ago, David Stewart
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.
Case Histories Of Pile Foundations In Bombay Region, K. R. Datye, J. R. Patil
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 …
Case History Of A Bridge Foundation, T. Z. Rao
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.
Discussions And Replies Session 1, T. P. Smith, Y. Iwasaki, D. Sielbach, C. Mirza
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.
Eccentric Loading Of Helical PiersTm For Underpinning, Gary Seider
Eccentric Loading Of Helical PiersTm For Underpinning, Gary Seider
International Conference on Case Histories in Geotechnical Engineering
Over the last six years, Helical Piers have been utilized as compression members in the remedial repair of residential and light commercial structures. Current installation techniques create a small offset between the pier shaft and the grade beam or footing being underpinned. The purpose of this study was to examine the effects of the eccentric load that is applied to the top of the shaft on the Helical Pier. Three different sizes of piers were installed at a building site where the soil is predominantly clay. Compressive loads were applied, and data was recorded from which bending moments versus depth, …
Failure Of Buildings Founded On Fills, Iqbal H. Khan, S. M. A. Kazimi
Failure Of Buildings Founded On Fills, Iqbal H. Khan, S. M. A. Kazimi
International Conference on Case Histories in Geotechnical Engineering
A number of cases have come to light in Delhi recently where partial or total failure of buildings has occurred. Two cases of failures due to excessive settlement are discussed. The nature of distress and the geotechnical factors leading to failures were investigated. It was found that in both cases the foundations were resting on fills, resulting in excessive settlement. Remedial measures were considered and in one case, these have been successfully implemented. A large number of structures were thus rehabilitated.
Instrumented Load Test On A Bent Pile, P. Dunlop, R. E. Sandiford, D. R. Erali
Instrumented Load Test On A Bent Pile, P. Dunlop, R. E. Sandiford, D. R. Erali
International Conference on Case Histories in Geotechnical Engineering
The load carrying capacity of a bent shell pile in soft silts and clays was determined from an instrumented test. Lateral pile displacements along the pile were measured during loading and unloading using an inclinometer traveling in a plastic casing. Pile capacity was estimated by Johnson's (1962) method prior to the load test and by the STRUDL structural engineering program after performing the load test. Both methods adequately predicted the pile performance. STRUDL, however, accommodated more realistic soil parameter variation and boundary conditions necessary for an integral soil-pile-structure interaction analysis.
Monitoring Of Load And Distribution In Long Caissons Under 49 Story Structure, W. A. Trow, T. G. Orpwood, R. L. Carrington
Monitoring Of Load And Distribution In Long Caissons Under 49 Story Structure, W. A. Trow, T. G. Orpwood, R. L. Carrington
International Conference on Case Histories in Geotechnical Engineering
This paper presents the results of settlement and load distribution monitoring carried out during the construction of a 49 storey condominium supported on long end-bearing caissons socketed into shale bedrock. Four caissons were instrumented to determine load distribution within the rock socket. One of these caissons also was instrumented to measure actual load reaching the top and bedrock level of the shaft. As of early March 1992, with the building already topped-off for over 6 months and about 100% of anticipated dead load applied, the settlement appears to consist entirely of elastic compression of the caisson shafts. Although the estimated …
Performance Of Fill Soils During The Loma Prieta Earthquake, J. D. Frost, F. A. Reyna, J. L. Chameau, P. Karanikolas
Performance Of Fill Soils During The Loma Prieta Earthquake, J. D. Frost, F. A. Reyna, J. L. Chameau, P. Karanikolas
International Conference on Case Histories in Geotechnical Engineering
The results of high quality in situ test results obtained at Hunter's Point Naval Station both before and after the Lorna Prieta earthquake are presented. The interpretation of these tests and the results of subsequent numerical ground motion analyses are validated by the observed response at that site during the event. Data show that densification of the loose fill soils occurred as a result of the seismic activity and corroborate the observed surface deformations.
Rigid Vs. Flexible Pile Caps: Case Study For 235 M. Delhi T.V. Tower, H. R. Viswanath
Rigid Vs. Flexible Pile Caps: Case Study For 235 M. Delhi T.V. Tower, H. R. Viswanath
International Conference on Case Histories in Geotechnical Engineering
Foundation for the prestigious 235m. Delhi television tower commissioned in 1988 in New Delhi consists of 279 reinforced concrete piles of 500 mm diameter with 1250 KN load carrying capacity. The tower is resting on a circular pile cap 32 m. diameter with an average thickness of 2.5 m. Pile cap was designed assuming full rigid conditions at site. When it was noticed that the pile reinforcement was predominantly anchored to the layers of the pile cap reinforcement, it was apprehended that this arrangement does not ensure complete rigidity as assumed, but it makes it only partially flexible. This paper …
Safety Evaluation Of Overhead Line Towers, M. P. Luong
Safety Evaluation Of Overhead Line Towers, M. P. Luong
International Conference on Case Histories in Geotechnical Engineering
A nondestructive vibratory testing using impulsive tension slacking has been devised for the quality and safety control of overhead line towers of Electricité de France. Several structural control experiments have been conducted on four-legged towers resting on three types of foundations: concrete stepped or pedestal blocks, steel piles and prestressed foundations. Experimental results have given significant vibratory signatures in close connection with the geotechnical response characteristics of both slender structures and their foundations. This paper presents some significant results of the test program of safety evaluation of the pylon.
Settlement Of Multi-Story Buildings On Sand Fills, K. J. Osinubi
Settlement Of Multi-Story Buildings On Sand Fills, K. J. Osinubi
International Conference on Case Histories in Geotechnical Engineering
The behaviour of two residential buildings with shallow foundations supported on sand fills with underlying soft alluvial deposits are discussed. Regular settlement measurements were taken for four and seven years on the foundations of the nine-storey and five-storey buildings respectively. Measured settlements have been compared with predictions based on the theory of one-dimensional consolidation. The factors that might have been responsible for the lower predicted settlement values are highlighted.
Soil-Structure Interaction And Aseismic Design Of A Stadium Building, V. D. Miglani
Soil-Structure Interaction And Aseismic Design Of A Stadium Building, V. D. Miglani
International Conference on Case Histories in Geotechnical Engineering
The paper presents case history of a reinforced concrete stadium building which had been structurally designed for a particular component configuration and also constructed upto seating level and which was referred to the author for suggesting structural modifications and redesigning for different configuration which meant curtailing middle two main columns each above the seating level out of four columns in each of left and right halves of the building. The required modifications necessitated analysis of the modified frame under static loads taking into account soil-structure interaction. The other problem to be tackled was ensuring lateral stability with reduced number of …
Stability Of A Mast Foundation: A Case Study, Yudhbir, P. K. Basudhar
Stability Of A Mast Foundation: A Case Study, Yudhbir, P. K. Basudhar
International Conference on Case Histories in Geotechnical Engineering
The paper describes details of analysis for stability and deformation of mast foundations during installation operations for a chemical reactor in alluvial deposits. Brief details of the loads involved, foundation type, installation procedure, and evaluation of geotechnical design parameters have also been presented. The successful installation of the reactor seems to support the predicted response of the foundation.