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Articles 35461 - 35490 of 39915

Full-Text Articles in Civil and Environmental Engineering

Forge Hammer Foundation On Dilative Soil, S. J. Yang May 1984

Forge Hammer Foundation On Dilative Soil, S. J. Yang

International Conference on Case Histories in Geotechnical Engineering

The property of dilative soil will further change when the dynamic force with different frequency acts on soil surface. So far, the physical process of this change remains unknown. However, it has been observed in the field test that dynamic force would increase the amount of the crevice of dilative soil and destroy the soil by combining with the external water.

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Foundation-Bearing-Rotor Interaction Problem In Controlling Vibrations In A 120 Mw Turbo Generator, Krishen Kumar, Shamsher Prakash May 1984

Foundation-Bearing-Rotor Interaction Problem In Controlling Vibrations In A 120 Mw Turbo Generator, Krishen Kumar, Shamsher Prakash

International Conference on Case Histories in Geotechnical Engineering

A two-pole turbogenerator posed problem of resonance and excessive vibrations at the operating speed during test runs in the Test-bed. The entire system comprising the foundation, pedestals supporting the generator, journal bearing seats, bearing oil-film, and the rotor has been modeled and analysed for computing the rotor's critical speeds as also the foundation's natural frequencies. Some of the system's parameters have been derived from actual tests. Sensitivity analysis for the rotor's critical speed that coincided with the operating speed of machine showed that this critical speed is relatively insensitive to the foundation mass as well as stiffness, and largely depends …

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General Report For Theme Six – Case Histories In Machine Foundations, Richard D. Woods May 1984

General Report For Theme Six – Case Histories In Machine Foundations, Richard D. Woods

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Machine Foundations In Power Plant And Other Industries- Case Studies, K. G. Bhatia May 1984

Machine Foundations In Power Plant And Other Industries- Case Studies, K. G. Bhatia

International Conference on Case Histories in Geotechnical Engineering

Studies on dynamic behaviour of turbo-generator foundations of various ratings have been carried out. Salient response parameters have been identified, Field vibration measurements taken on a 200 MW T.G. foundation have been reported. Measurements taken under intermittent coast-up and constant speed conditions have been analysed using FFT analyser and the frequency response thus obtained has been presented and discussed. From the signature analysis, high vibration peaks associated with the soil vibration modes have been observed. Analytical study carried out for 200 MW TG foundation also indicated the significance of soil structure interaction effect on the dynamic response. Based on the …

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Vibration Studies Of Block Type Machine Foundations, S. K. Guha May 1984

Vibration Studies Of Block Type Machine Foundations, S. K. Guha

International Conference on Case Histories in Geotechnical Engineering

Detailed vibration measurements were undertaken at eight block type machine foundations with different supporting soil conditions. These extensive measurements were supplemented by theoretical vibration calculations using principally Barkan's method but, at times, using methods of Reissner, Pauw, Richart and Ford and Haddow. The results of prototype experiments and theoretical studies on various compressor foundations described above as also on similar foundations in the country justify broadly the validity of various theories, particularly Barkan’s method, though these are based on somewhat different concepts. Design criteria for foundations are generally described in terms of limiting values of amplitudes of displacement at the …

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General Report For Theme Seven – Case Histories In Rock Mechanics, Alfred J. Hendson Jr. May 1984

General Report For Theme Seven – Case Histories In Rock Mechanics, Alfred J. Hendson Jr.

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Mechanised Rock Tunneling In Adverse Conditions, I. Mcfeat-Smith May 1984

Mechanised Rock Tunneling In Adverse Conditions, I. Mcfeat-Smith

International Conference on Case Histories in Geotechnical Engineering

Several case histories are presented in order to highlight the way in which unexpected adverse geological conditions promote large delays in rock tunnelling. These are selected from tunnels which have been excavated by drill and blast, roadheader and fullface tunnel boring machines. In each case the important properties of rock affecting the progress rates obtained are identified together with the nature of the tunnelling problems encountered.

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Research On Slope Stability Of A Certain Open-Pit Mine, Wang Wuling May 1984

Research On Slope Stability Of A Certain Open-Pit Mine, Wang Wuling

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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The Experience Of A Dam Founded On Difficult Rock Foundation, Jian-Yun Mei, Yu-Yin Guo May 1984

The Experience Of A Dam Founded On Difficult Rock Foundation, Jian-Yun Mei, Yu-Yin Guo

International Conference on Case Histories in Geotechnical Engineering

This paper summarize all the respects related to the in-situ test of rock mechanical properties, model experiments, FEM analysis and the data of prototype monitoring of a dam founded on the complex rock foundation. Basing on these informations the reasonableness of the adopted design scheme is discussed.

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A Case Of Land Use And Urban Planning In The Expansive-Soil District, Hou Shitao, Wang Siyi, Zhou Jibing, Cao Kezhi May 1984

A Case Of Land Use And Urban Planning In The Expansive-Soil District, Hou Shitao, Wang Siyi, Zhou Jibing, Cao Kezhi

International Conference on Case Histories in Geotechnical Engineering

Taking the construction and reform planning for new town of Yunxian County as an example, this paper deals with the principles of land development and use and town construction and reform planning in the expansive-soil area in the case of undulating mountain topography, including the problems of treating expansive-soil slope, of treating expansive-soil foundation etc., not involving other aspects of general planning.

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A Case Of Singular Geotechnical Failure For Industrial Structures In The Peruvian Andes, A. Carillo Gil, R. Torres Vega May 1984

A Case Of Singular Geotechnical Failure For Industrial Structures In The Peruvian Andes, A. Carillo Gil, R. Torres Vega

International Conference on Case Histories in Geotechnical Engineering

During the rainy season of 1982, foundation distress was occurred at several recently completed and still incomplete structures of an important mine project located in the Peruvian Andes. When the tailings thickener was tested an unexpected settlement started, some cracking was observed in the slab, and the central pier settled and tilted. The nature of the distress suggested the failure occurred as the result of the combined effect of a long term seepage under the bearing foundation soil and due to its different degree of compaction. This paper presents the characteristics of these problems as both foundation and fill materials, …

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A Dockwall Failure In Milwaukee, Wisconsin, A. B. Wagner May 1984

A Dockwall Failure In Milwaukee, Wisconsin, A. B. Wagner

International Conference on Case Histories in Geotechnical Engineering

In 1975, a dockwall at the Port of Milwaukee, Wisconsin failed as salt was being deposited behind the wall. In 1981, exploration at the site was required for a new development. The exploration program included field testing to measure the shear strength of the organic soils through which the failure occurred. Dutch cone and vane shear devices were used. Continuous undisturbed samples were obtained in two (2) borings. This allowed an accurate determination of the stratigraphy in the slide area. The shear strength of the undisturbed samples was measured in the laboratory by means of the Torvane device. The shear …

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General Report For Theme Eight – Case Histories In Selection Of Sites For Industrial Structures And Determination Of Design, P. D. Deo May 1984

General Report For Theme Eight – Case Histories In Selection Of Sites For Industrial Structures And Determination Of Design, P. D. Deo

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Geotechnical Investigations For Foundation Design For Multi-Storeyed Building, S. C. Handa, Swami Saran, G. Ramasamy, A. S. R. Rao, B. Prakash May 1984

Geotechnical Investigations For Foundation Design For Multi-Storeyed Building, S. C. Handa, Swami Saran, G. Ramasamy, A. S. R. Rao, B. Prakash

International Conference on Case Histories in Geotechnical Engineering

Oil and Natural Gas Commission of India plans to construct a multi-storeyed building in Dehradun city at the foothills of Himalayas. The geotechnical investigations were carried out at site to determine soil parameters for foundation design. It was found that it was not possible to provide a raft foundation for the building and hence alternatively the pile foundation was suggested. The pile load capacity was predicted on the basis of soil parameters determined and a comparison was then made with the results obtained by carrying out load tests on constructed piles.

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Siting For A Nuclear Power Plant In Saudi Arabia, A. A. Sabtan, W. M. Shehata May 1984

Siting For A Nuclear Power Plant In Saudi Arabia, A. A. Sabtan, W. M. Shehata

International Conference on Case Histories in Geotechnical Engineering

A site reconnaissance study was conducted in the mid-western coastal area of Saudi Arabia to select the most suitable site for a nuclear power plant. Three potential sites near Yanbu, Rabigh and Jeddah were selected, evaluated and ranked according to their acceptability based on the U.S. Atomic Energy Commission Regulatory criteria. Based on this preliminary investigation, it was found that the area south of Yanbu city is the most feasible site. Geotechnical properties of the soil and rock, seismicity and proximity to load center played an important role in Yanbu site selection. More detailed study is recommended for this site. …

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Siting Study For An Aluminum Plant In Central Kentucky, Grover C. Cox Iii May 1984

Siting Study For An Aluminum Plant In Central Kentucky, Grover C. Cox Iii

International Conference on Case Histories in Geotechnical Engineering

This paper describes a soil and rock exploration program that studied three (3) alternate sites for a 2,600 foot long aluminum production facility. Based on the results of the preliminary explorations, the third side was selected, although it had the poorest geotechnical properties and would be the most expensive to develop. This site contained karst features. Therefore, the major objective of the continuing exploration and design program was the overall clarification and quantification of the degree and distribution of solution activity across the site and its effect on construction planning and operations. A detailed analysis of the subsurface geohydrology was …

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Study Of Vibration In Site Selection For A Precision Instrument Factory, Pan Fulan May 1984

Study Of Vibration In Site Selection For A Precision Instrument Factory, Pan Fulan

International Conference on Case Histories in Geotechnical Engineering

Antivibration is an important consideration in site selection for setting up a precision instrument factory. Any negligence to this could bring to the future production a great deal of trouble, as that the measurement will be inaccurate, the precision of products will not be up to the requirements, the instruments and meters will be damaged. In this paper, case histories in selection of site of the factory are described briefly. Then based on the site tests and wave theory, the formula for calculating the attenuation of amplitude, the principles for selecting the site of a factory and the necessary distances …

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Behavior Of Two Big Rockfill Dams, And Design Aims, V. F. B. De Mello May 1984

Behavior Of Two Big Rockfill Dams, And Design Aims, V. F. B. De Mello

International Conference on Case Histories in Geotechnical Engineering

The case histories of two major compacted embankment dams are analysed with regard to the problem most amenable to reasonings and computations of statistics of averages, the problem of deformations, discussed regarding specific laboratory testing compared with use of generalized correlations. Improved mental models for predictions are proposed. In the earthcore-compacted rockfill section the problem of crest cracking suggests the interest in a significant change of zoned section in the topmost stretch. For the concrete-face rockfill dam it is suggested that one needs a significant revision of instrumentation and monitoring orientation. Both dams behaved extraordinarily well on questions of consequence …

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Case Histories For Today's Geotechnique, R. B. Peck May 1984

Case Histories For Today's Geotechnique, R. B. Peck

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Case History - Hyperbolic Cooling Tower Foundation, L. J. Almaleh May 1984

Case History - Hyperbolic Cooling Tower Foundation, L. J. Almaleh

International Conference on Case Histories in Geotechnical Engineering

This paper summarizes the design considerations and construction techniques employed during the construction of two hyperbolic cooling tower foundations. Included are descriptions of the site conditions, foundation loading requirements, drilled pier design techniques, construction coordination, and foundation installation.

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Case History On Dewatering Problems In Shanghai, L. X. Shi May 1984

Case History On Dewatering Problems In Shanghai, L. X. Shi

International Conference on Case Histories in Geotechnical Engineering

This paper deals with the dewatering problems in soft soils; it also describes the historical review of the dewatering work in the Shanghai region. In some cases, the measures taken in preventing the settlement of the neighbouring buildings have been introduced.

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Densifying A Landfill For Commercial Development, S. B. Steinberg, R. G. Lukas May 1984

Densifying A Landfill For Commercial Development, S. B. Steinberg, R. G. Lukas

International Conference on Case Histories in Geotechnical Engineering

This paper presents a case study of a dynamic compaction ("pounding") project, undertaken in Skokie, Illinois. The purpose was to densify a 50-ft deep former municipal waste landfill for support of a one-story warehouse structure on shallow foundations. The majority of the pounding was performed utilizing a 15-ton weight falling from a height of 60 ft. In some areas, lower energy levels were used for surface compaction. All phases of the project are discussed, beginning with the subsurface exploration program and geotechnical analysis, through the experimental test pounding section, and the final check borings to observe that the "production" pounding …

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Design Of Road Cut Adjacent To Existing Structure, G. C. Whited, C. N. Laughter May 1984

Design Of Road Cut Adjacent To Existing Structure, G. C. Whited, C. N. Laughter

International Conference on Case Histories in Geotechnical Engineering

Interchange improvements within an urban environment required the deepening of a hillside cut. Design restraints required as deep a cut as possible without disturbing a water tower located at the crest of the slope or interfering with a shopping center at the toe. The water tower, constructed in 1933 with a steel tank encased in a concrete and brick structure, was founded on shallow spread footings. Foundation soils were silts and silty sands with seams of silty clay. The design investigation involved hydrogeologic studies, SPT borings, undisturbed sampling, laboratory testing, and stability analyses. Laboratory studies involved routine and unusual testing …

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Dewatering Of The Construction Site For A 200-Foot Diameter Clarifier Tank Founded On Sand And Gravel, Grover C. Cox Iii May 1984

Dewatering Of The Construction Site For A 200-Foot Diameter Clarifier Tank Founded On Sand And Gravel, Grover C. Cox Iii

International Conference on Case Histories in Geotechnical Engineering

This paper presents the preliminary design, the field modifications applied to the final design, and additions made to the dewatering system for a wastewater treatment plant. The site history is described, as are the exploration, design and construction phases of the dewatering operation. The difference between the predicted results and the actual results and lessons learned from experience in the field are discussed. The data includes design parameters for hydrological applications derived from the site soils and the groundwater elevations from one month before the beginning of construction through the construction of the clarifier tank and an additional pump building.

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Direct And Indirect Influence Of Mining Related Subsidence On Structural Damages - A Case Study, H. J. Siriwardane, L. K. Moulton May 1984

Direct And Indirect Influence Of Mining Related Subsidence On Structural Damages - A Case Study, H. J. Siriwardane, L. K. Moulton

International Conference on Case Histories in Geotechnical Engineering

An investigation of causes of damages to a structure located at a toe of a hillside over an undermined area is described. The investigation included a finite element analysis and an analysis of landslide susceptibility of the hillside. Direct and Indirect influence of mining activity appears to be the cause of structural damages.

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Dykes On Clay Foundation At Bersimis 2, S. Z. Akber May 1984

Dykes On Clay Foundation At Bersimis 2, S. Z. Akber

International Conference on Case Histories in Geotechnical Engineering

This paper discusses the behaviour (settlement, high foundation pore pressure, horizontal displacement and seepage) of two dykes founded on a thick clay deposit, since their completion in December, 1958 to date. In the first case, coarse and fine sand layers successively cover an over sixty meters thick clay deposit; in the second case, an eight to thirty meters thick clay layer is underlain by a heterogeneous granular deposit. Foundation treatments including problems encountered during the foundation works are discussed. Results of static and pseudo-static analyses carried out using the measured high pore pressures are compared with the factors of safety …

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General Report A For Theme Nine – Case Histories In Subsidence Of Soils, Tunnels And Shafts In Soft Ground, Waste Disposal Sites And Pavements, Hal Aldrich May 1984

General Report A For Theme Nine – Case Histories In Subsidence Of Soils, Tunnels And Shafts In Soft Ground, Waste Disposal Sites And Pavements, Hal Aldrich

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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General Report B For Theme Nine – Geotechnical History Of Projects Other Than Presented In Sessions 1-8, Charles Mansur May 1984

General Report B For Theme Nine – Geotechnical History Of Projects Other Than Presented In Sessions 1-8, Charles Mansur

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Geotechnical Aspects Of The Fort Mchenry Tunnel - Design And Construction, S. K. Sarkar, G. A. Munfakh May 1984

Geotechnical Aspects Of The Fort Mchenry Tunnel - Design And Construction, S. K. Sarkar, G. A. Munfakh

International Conference on Case Histories in Geotechnical Engineering

The geotechnical considerations affecting the design and construction of an immersed-tube tunnel are presented. Construction of the tunnel required deep excavations in overconsolidated fissured and slickensided clay deposits. Undrained, long-term residual and fully softened drained strength parameters were determined. The depth of excavation and the life of the cut slope were considered in selecting the design parameters for the slope study analysis. A tied-back soldier pile and lagging system was used for protection of the east end excavation in a congested urban area. Each tie-back was tested according to a simple acceptance criteria developed during construction. Lateral displacements measured behind …

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Ground Improvement For Oil Tank Farm In Indonesia, A. F. Abbs, J. M. Cognon, R. W. N. Kelsey May 1984

Ground Improvement For Oil Tank Farm In Indonesia, A. F. Abbs, J. M. Cognon, R. W. N. Kelsey

International Conference on Case Histories in Geotechnical Engineering

This case study describes the use of ground improvement to treat a highly variable site, where new oil storage tanks were constructed. Varied techniques were used comprising a combination of dynamic compaction, preload, vertical drains and replacement. Settlement data from the storage tanks during water test shows the treatment to have been successful.

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