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Articles 35281 - 35310 of 39882

Full-Text Articles in Engineering

Conference Committees, Multiple Members May 1984

Conference Committees, Multiple Members

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Bearing Capacity Of Piles Under Long-Term Vibration, Xu You Zai, Liu Yao Fu, Shi Yul Iang, Xin Su Lan May 1984

Bearing Capacity Of Piles Under Long-Term Vibration, Xu You Zai, Liu Yao Fu, Shi Yul Iang, Xin Su Lan

International Conference on Case Histories in Geotechnical Engineering

The Bearing capacity of piles under long-term vibration is herein discussed. A real case of continuous subsidence of vibrating pile foundations is presented with a set of vibratory loading tests in-situ and the characteristics of settlement-time curves are described. Analyses of the observed data are made and the additional plastic deformation induced in the soil strata under the piles is interpreted. Based on the test data, authors recommend a conception of long-term bearing capacity of piles to be used in the design of pile foundation under vibration instead of the conventional one, and a method of determination of bearing capacity …

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Design Considerations And Long-Term Performance Of A Building Foundation In Clay, G. E. Bauer May 1984

Design Considerations And Long-Term Performance Of A Building Foundation In Clay, G. E. Bauer

International Conference on Case Histories in Geotechnical Engineering

Based on the results of a full-scale footing tests, spread footings were used instead of end-bearing piles to support a four storey building extension. Five proto-type footings were instrumented and the settlement behaviour was monitored over 13 years. Special construction procedures had to be employed to achieve compatible differential settlements between the individual footings and the adjacent existing building.

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Excessive Settlement In Buildings, A. Verghese Chummar May 1984

Excessive Settlement In Buildings, A. Verghese Chummar

International Conference on Case Histories in Geotechnical Engineering

The paper deals with three case studies where the foundations of buildings in the coastal areas of South India settled from 10 to 100 Cms resulting in excessive tilt or cracks in the superstructure. Details of soil exploration work carried out, description of the soil characteristics and the analysis of the causes of settlement are dealt with in this paper. The remedial measures suggested for the possible rectification of the damages are also presented.

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Failure Of The Ghana Law School Building In Accra, Ghana, N. K. Kumapley, S. Ramachandra May 1984

Failure Of The Ghana Law School Building In Accra, Ghana, N. K. Kumapley, S. Ramachandra

International Conference on Case Histories in Geotechnical Engineering

The immediate post-independence era in Ghana, namely the late 1950's to early 1960's, was characterised by extensive physical and infrastructural development, for most of which proper design and construction records were either not kept or were lost. This has often led to difficulties when remedial measures have to be designed for some of these structures which have failed after only a few years in service. The paper describes attempts to diagnose the cause(s) of failure and to design remedial measures for one such structure in the absence of original construction records.

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Foundation Design And Construction For A Large Mill Complex, C. R. I. Clayton, J. Milititsky, L. J. L. Carvalho May 1984

Foundation Design And Construction For A Large Mill Complex, C. R. I. Clayton, J. Milititsky, L. J. L. Carvalho

International Conference on Case Histories in Geotechnical Engineering

Very little good field data exists concerning the performance of heavily loaded end-bearing piles on thin layers of weak rock. The problems associated with the foundations for silos are often severe, since loads are normally heavy, and allowable differential settlements are often very small. The paper describes just such problems, associated with the construction of a flour mill complex, where the principal problems were associated with the uncertainties of pile performance. On the basis of the uniaxial unconfined compressive strength of the supporting rock the end-bearing piles supporting silos within the mill appeared to be overloaded. A programme of slow …

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Foundation Performance Of Very Old Structures, S. C. Handa May 1984

Foundation Performance Of Very Old Structures, S. C. Handa

International Conference on Case Histories in Geotechnical Engineering

Withstanding the agents of destruction for several centuries, some of the structures in this world, exist as a testimony to the sound and perfected techniques of construction used in years that belong to the bygone past. Among the most famous are Taj Mahal and Qutb Minar, still standing in a magnificent and sound condition. One of the wonders of the world, Taj Mahal though built in seventeenth century still looks so fresh that the super-structure performance also speaks of the adequate and perfect foundation that must have been built for it. This paper deals with subsoil conditions at site, the …

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Negative Friction And Lateral Loading On Piles, E. E. De Beer, M. Wallays, E. Goelen May 1984

Negative Friction And Lateral Loading On Piles, E. E. De Beer, M. Wallays, E. Goelen

International Conference on Case Histories in Geotechnical Engineering

An example is first given of a structure founded on piles and having suffered damages caused by negative friction and passive lateral loading on the supporting piles. It appears that the effects of negative friction are in general less disastrous than should be expected from a simplified theoretical approach. The described case shows that, at the contrary, the passive lateral loadings, when not accounted for, become rapidly detrimental. Both influences are time delayed, with the consequence that the critical situation does mostly not occur during construction, but a certain time after completion. The design of a second structure, in which …

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Performance Of Large Diameter Oil Storage Tanks, I. K. Ozaydin, S. Y. K. Inan May 1984

Performance Of Large Diameter Oil Storage Tanks, I. K. Ozaydin, S. Y. K. Inan

International Conference on Case Histories in Geotechnical Engineering

The performance of very large diameter petroleum storage tanks erected at Ipras Refinery in Turkey are presented. The findings and predictions of the geotechnical investigation carried out before the construction are summarized together with the observed behavior during the water load tests. The results of a post-construction investigation performed to evaluate the observed behavior, and comparisons between the predicted, observed and back-calculated behaviors are presented and discrepancies encountered are discussed.

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Philip Morris Corporate Headquarters Building, A. J. Ciancia, H. M. Horn May 1984

Philip Morris Corporate Headquarters Building, A. J. Ciancia, H. M. Horn

International Conference on Case Histories in Geotechnical Engineering

The temporary support of three city streets, a subway tunnel, and a high-rise office tower during the construction of the Philip Morris Corporate Headquarters Building is discussed. The results of an extensive field exploration program, consisting of test borings, probes, and geologic mapping were evaluated for the design of temporary support systems; i.e., rock anchors and rakers. Borehole extensometers and conventional optical survey techniques were successfully used to monitor movements of the adjacent structures during demolition operations of a building that occupied the site. Minimal movements were measured during demolition. At the northeast corner of the site, six heavily loaded …

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Recovering Differential Settlements By Vertical Drains, C. Mastrantuono, A. Tomiolo, E. Arcangeli May 1984

Recovering Differential Settlements By Vertical Drains, C. Mastrantuono, A. Tomiolo, E. Arcangeli

International Conference on Case Histories in Geotechnical Engineering

The differential settlement recovering of a large six storeys building by means of overloading and vertical drains is described. The results are discussed in relation with the geotechnical characteristics of the soil and by numerical analyses of the settlement curves.

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Settlement Experienced At A Recently Licensed Nuclear Station, J. T. Chen, L. W. Heller May 1984

Settlement Experienced At A Recently Licensed Nuclear Station, J. T. Chen, L. W. Heller

International Conference on Case Histories in Geotechnical Engineering

The settlement experienced at a recently licensed nuclear station demonstrated the need for coordination among geologists, geotechnical engineers and structural engineers to ensure that essential geological knowledge and experience is applied to the design and construction of the structures. The nuclear station had been under construction for a number of years when unexpected settlements were noticed which caused significant concrete cracking of the nuclear service water intake structure. The “seismic Category I” intake structure has an internal dimension of 12 feet wide by 15 feet high, a length of 167 feet with the thickness of walls and roof varied from …

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Settlement Observations On Two Mat Foundations, E. Winter, P. Chung May 1984

Settlement Observations On Two Mat Foundations, E. Winter, P. Chung

International Conference on Case Histories in Geotechnical Engineering

The performance of two mat foundations is examined. The first case history includes a mat founded over generally granular terrace soils, underlain by a deep clay layer of medium compressibility. The second case history includes a mat over stiff preconsolidated clay. The mats are analyzed based on laboratory test and field pressuremeter data using the Winkler method. The particular approach taken in the analysis includes the determination of the modulus of subgrade reaction for the design using Vesic's method. Vesic (1968). This calculation was developed for pavements but is based on the theory of plates on elastic media which applies …

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Settlement Of A Building Founded On Difficult Soil, Iqbal H. Khan, Fathi M. Layas May 1984

Settlement Of A Building Founded On Difficult Soil, Iqbal H. Khan, Fathi M. Layas

International Conference on Case Histories in Geotechnical Engineering

Many coastal areas in Benghazi have been reclaimed from lagoons. Quite often such areas are covered by debris, rubbish and other artificial fills over many years. The proximity of these deposits to the Mediterranean Sea coupled with the seasonal moisture variations has resulted in the formation of the so-called Sabkha soils having a high proportion of chemical content. Settlement records of a four storey building founded on sabkha soil are prescuted for seven years. The building underwent large settlement resulting in a tilt from the vertical. It is found that, for Sabkha soils, the measured settlement is larger than that …

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Settlement Of A One Floor Building On Soft Clay Beside A Heavy Building, Mohamed A. El-Sohby, Ossama Mazen May 1984

Settlement Of A One Floor Building On Soft Clay Beside A Heavy Building, Mohamed A. El-Sohby, Ossama Mazen

International Conference on Case Histories in Geotechnical Engineering

A one floor building was founded on a deposit of normally consolidated soft clay. It was constructed to annex an existing three storey high building founded on piles. After construction, tilting and settlements of the Annexe were detected relative to the existing building. Recorded absolute and differential settlements, monitored over a period of five years, were considerably high. It is shown here that this could be caused by the combined effect of high compressibility, confinement of clay layers and variations in pressure distribution below foundations.

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Settlement Performance Of A Mat Foundation On Unsaturated Loess, Alan J. Lutenegger, Bernard D. Remmes, Leo D. Handfelt May 1984

Settlement Performance Of A Mat Foundation On Unsaturated Loess, Alan J. Lutenegger, Bernard D. Remmes, Leo D. Handfelt

International Conference on Case Histories in Geotechnical Engineering

Previously reported settlements of structures founded on loess soils in the United States have been limited to cases of rapid deformation: the result of wetting and structural collapse. While the possibility of subsidence is usually a consideration in design, when the potential for wetting does not exist, economics generally govern the use of a shallow foundation system; in which case an accurate prediction of settlement is required. Since most loess deposits occur as unsaturated sediments, the use of one-dimensional consolidation theory is not applicable to the problem of settlement prediction. In 1977, a circular mat foundation was constructed on typical …

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Stability Problems In A Deep Excavation In Clay, Gunnar Aas May 1984

Stability Problems In A Deep Excavation In Clay, Gunnar Aas

International Conference on Case Histories in Geotechnical Engineering

This paper describes the excavation procedure and some stability problems encountered in connection with a 10-m deep braced excavation in medium soft Oslo clay. Very large deformations in the first excavated sections made it clear that the factor of safety with respect to bottom heave failure was very close to unity, and hence, much lower than the value of 1.5 calculated from a conventional total stress analysis based on vane strength. Thus, the experiences from this excavation yield an excellent opportunity to test new and better methods of stability analysis which have been developed during the last 10 years. Furthermore, …

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Repair Of A Reinforced Earth Wall, N. T. Long, J. Livet, M. Boutonnet, J. Marchal, G. Olivier, A. Nabonne, E. Plaut May 1984

Repair Of A Reinforced Earth Wall, N. T. Long, J. Livet, M. Boutonnet, J. Marchal, G. Olivier, A. Nabonne, E. Plaut

International Conference on Case Histories in Geotechnical Engineering

The facing of a Reinforced Earth retaining wall, built at an altitude of 1200 m, was damaged during the winter 1981. The repair was achieved quickly and under traffic. The instrumentation carried out on the repairs and the tests run on the backfill material have revealed the action of the frost and its increase in the fortuitous presence of water.

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Thrust Evolution On The Shoring Of Two Large Excavations In Geneva, A. Fontana May 1984

Thrust Evolution On The Shoring Of Two Large Excavations In Geneva, A. Fontana

International Conference on Case Histories in Geotechnical Engineering

This study presents the results of thrust measures on the shoring of two large excavations, located in downtown Geneva, in fine saturated soils of low capacity and great thickness. Loads were measured by regular extensometer readings, completed in one excavation by three daily readings on VSL load cells. Although the obtained measurements seem puzzling at first sight, their analysis enable to draw some useful conclusions for the design of deep retaining structures.

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Use Of Ground Anchors In Residual Soils, R. Kannan, Bengt B. Broms May 1984

Use Of Ground Anchors In Residual Soils, R. Kannan, Bengt B. Broms

International Conference on Case Histories in Geotechnical Engineering

In the past decade the use of ground anchors in deep basements has increased in most parts of the world, while their applications in Singapore have been very limited so far because of their interference with adjacent properties. Empirical design methods which are adequate in most cases are still commonly used. Analytical design methods and finite element analysis (FEM) which give better insight into the soil-anchor interaction are gaining popularity. Post grouting is often used for anchors in residual soils and has been found successful. Some case histories from Singapore are presented in this paper.

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Load Measurements Of An Anchored Retaining Wall, P. Rocha Filho, N. M. Zeitoune May 1984

Load Measurements Of An Anchored Retaining Wall, P. Rocha Filho, N. M. Zeitoune

International Conference on Case Histories in Geotechnical Engineering

Thirty six anchors, corresponding approximately to five per cent of the total anchors of a retaining wall, were instrumented using electrical load cells, aiming to study the variation of the applied load with time associated with the sequencing of construction. It was observed that the average total loss was 25% of the average applied load, which consisted of three major component: rapid loss; long term loss and loss due to adjacent anchors loading.

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Anchor Slab Retaining Wall Stands Overtopping Flood, Z. L. Wang, X. M. Wu, Z. S. Zhang May 1984

Anchor Slab Retaining Wall Stands Overtopping Flood, Z. L. Wang, X. M. Wu, Z. S. Zhang

International Conference on Case Histories in Geotechnical Engineering

An anchor slab retaining wall which stands seasonal overtopping floods was constructed in 1980 beside a river in the valley of Nanping, Fukien Province, China. Monitor measurements of its stresses and deformations were taken during the mean water level and flood seasons every year since its completion. The results of three years' observations and measurements proved that the wall is stable against floods and the earth pressure is slightly higher than the designed value.

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Performance Of A 30 M Deep Instrumented Diaphragm Wall, M. M. Soares May 1984

Performance Of A 30 M Deep Instrumented Diaphragm Wall, M. M. Soares

International Conference on Case Histories in Geotechnical Engineering

This paper summarizes the performance of the second instrumented research section of the Rio de Janeiro underground. The first aim of this programme was to establish a simple procedure to design diaphragm walls in soft clay soils. The model of a beam on elastic supports was chosen due to its simplicity and usefulness in the prediction of the wall behaviour. The concrete wall was built using the slurry trench technique and was instrumented to measure the concrete strain, the load on the reinforcement bars, the horizontal displacement and the horizontal earth pressure. It was measured the loads in the two …

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Permanent Tieback Retention System, T. C. Anderson, M. E. Lockwood, M. F. Nethero May 1984

Permanent Tieback Retention System, T. C. Anderson, M. E. Lockwood, M. F. Nethero

International Conference on Case Histories in Geotechnical Engineering

This paper describes the design, construction, and monitoring of a permanent tieback retention system which permitted a 55-foot-deep excavation for an 16-story addition to the existing Good Samaritan Hospital in Cincinnati, Ohio. Tieback anchor capacity is developed in moderate-to-low-strength shale bedrock with intermittent thin limestone layers. The retention system provides temporary and permanent support for adjacent 5- and 10-story buildings and unbalanced lateral earth pressures due to sloping site topography. A permanently tiedback wall also supports a 17-to-33-foot-deep cut adjacent to the a-story parking structure in lieu of a conventional retaining wall.

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Discussions And Replies, Multiple Authors May 1984

Discussions And Replies, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Embankments Built Over Swamps, Samuel Y. Ng, James C. Rudd May 1984

Embankments Built Over Swamps, Samuel Y. Ng, James C. Rudd

International Conference on Case Histories in Geotechnical Engineering

Time and environmental constraints necessitated the development of unique methods for building earthen embankments over very deep and soft swamp deposits. Three case histories are presented. Construction techniques included alternate strip embankments, use of flexible vertical and horizontal drains, use of wood chips and high strength geotextile and the conventional stage and preloading techniques. In all cases, field instrumentation including pore-pressure/settlement transducers was installed to monitor the fill placement. The monitoring results were fed into a computer to determine the safety factor against shear failure and amount of settlement. The field monitoring results and predicted values agreed very well.

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Failure Of Micaceous Waste Tailings Dam, W. F. Brumund May 1984

Failure Of Micaceous Waste Tailings Dam, W. F. Brumund

International Conference on Case Histories in Geotechnical Engineering

The paper describes the failure and reconstruction of an 80 ft. high, 8 acre tailings impoundment in Western North Carolina. The darn was constructed using the upstream method of construction. The coarse fraction of the tailings was used as embankment construction materials; these consisted of coarse to fine sands. The fine fraction tailings consisted of low density, relatively low plasticity, layered fine sands and fine sandy silts with frequent inter bedding of micaceous silty clays. Although a 20.0 ft. section of the darn failed, the fine saturated tailings did not liquefy but rather slumped into the breach. Reconstruction was complicated …

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Lake Monona Causeway - Madison, Wisconsin, Usa, W. W. Warzyn, C. A. Stoll May 1984

Lake Monona Causeway - Madison, Wisconsin, Usa, W. W. Warzyn, C. A. Stoll

International Conference on Case Histories in Geotechnical Engineering

In 1965 and 1966, a 3,500’ long, hydraulically-placed, highway embankment was constructed over the very soft lakebed deposits of Lake Monona. The compressible deposits, which ranged in thickness from 40’ to 80’, included marl, organic silt and silty clay. An incipient shear failure occurred near the end of the 1965 construction season, necessitating embankment design and construction modifications. Pertinent slope stability and settlement data are summarized, as are time dependent changes in in-situ subsoil parameters. Measured settlements, which currently range from 3’ to more than 12’, agree well with basic consolidation theory and engineering predictions formulated at project inception. General …

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Open Pit Mine Rock Dump Geotechnical Evaluation, Z. M. Zovodni, J. D. Tygesen, S. C. Pereus May 1984

Open Pit Mine Rock Dump Geotechnical Evaluation, Z. M. Zovodni, J. D. Tygesen, S. C. Pereus

International Conference on Case Histories in Geotechnical Engineering

Open pit mining generally involves moving large quantities of waste rock to disposal areas which are usually located near the mine. This waste rock must be disposed of in a safe, economical, and environmentally acceptable manner. The stability of the waste dump depends to a great extent on the physical properties of the underlying foundation. Information must be obtained to define and assess the strength, consolidation, distribution, topographic and hydrogeologic properties for the foundation materials. Methods for obtaining estimates of the material properties include: laboratory and field testing, back analysis, and indirect estimates from other material properties. Mining operations in …

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Peculiar Behaviour Of The Manicouagan 3 Dam's Core, O. Dascal May 1984

Peculiar Behaviour Of The Manicouagan 3 Dam's Core, O. Dascal

International Conference on Case Histories in Geotechnical Engineering

The presence of some horizontal or subhorizontal zones of weakness (cracks or decompressed layers) led to high pressure development in the downstream part of the relatively wide till core of Manic 3 dam. A short description of the investigation works to determine the location of the weakness zones and an analysis of the causes which produced these zones are presented in this paper.

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