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1984

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Articles 271 - 300 of 408

Full-Text Articles in Civil and Environmental Engineering

Rock Borer Attack On Juaymah Trestle Concrete Piles, E. A. Wiltsie, W. C. Brown, K. Al-Shafei May 1984

Rock Borer Attack On Juaymah Trestle Concrete Piles, E. A. Wiltsie, W. C. Brown, K. Al-Shafei

International Conference on Case Histories in Geotechnical Engineering

Rock boring mollusks and sponges are infesting the concrete cylinder piles supporting the Juaymah NGL Trestle located in the western Arabian Gulf. The calcareous aggregate used in pile fabrication provides a favorable substrate for borer activity. Rock boring organisms are common in the Arabian Gulf and typically inhabit nearshore reefs and exposed limestone bottom areas. Although the entire trestle wetted area is subject to attack, infestation is concentrated in the area adjacent to reefs and limestone, on the down current pile face and near the water surface. Boring organisms pose a significant threat to the trestle structural integrity, in that …

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A Comparison Of Methods Of Estimating The Attenuation Of Earthquake Strong Ground Motion, O. W. Nuttli, R. B. Herrmann May 1984

A Comparison Of Methods Of Estimating The Attenuation Of Earthquake Strong Ground Motion, O. W. Nuttli, R. B. Herrmann

International Conference on Case Histories in Geotechnical Engineering

Strong ground-motion attenuation relations take on a variety of forms, depending upon the parameters used to express the relations and upon the geographic area for which the equations are developed. In general the strong ground-motion parameters, namely acceleration, velocity, displacement and response spectra ordinates, are taken to be proportional to the distance from the earthquake source to the site, to the magnitude or some measure of the strength of the earthquake source, and to loss factors resulting from transmission of energy through the inelastic earth. In certain areas of the world, where strong-motion data are abundant, empirical relations can be …

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A Geotechnical Study For Land-Use Planning Purposes, F. Ciuffi May 1984

A Geotechnical Study For Land-Use Planning Purposes, F. Ciuffi

International Conference on Case Histories in Geotechnical Engineering

The purpose of this paper is to describe the different stages and the final results of a geotechnical study for use by planners in zoning a seismic area in the south of Italy. Particular attention is given the method followed to draw a “Geotechnical Seismic Zoning Map”. Also described in summary fashion are a number of dynamic laboratory tests carried out and their results.

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Assessment Of Earthquake Size From Rock Fracture Dimensions Of Seismic Source In Geotechnical Earthquake Engineering Investigations, L. S. Srivastava May 1984

Assessment Of Earthquake Size From Rock Fracture Dimensions Of Seismic Source In Geotechnical Earthquake Engineering Investigations, L. S. Srivastava

International Conference on Case Histories in Geotechnical Engineering

The paper presents two case histories of rock fractures resulting in strong ground motion. Case I describes the November 27, 1971 rock burst involving 270 m long rupture with displacement of 15 mm in Nundydroog mine in Kolar Gold Field in Karnataka State, India, which resulted in damage to buildings on the surface and underground works in the mine. The event was recorded as an earthquake by seismic stations and the computed magnitude ml = 3.9 of the rockburst compares well with magnitude mb= 4.6 determined from the recorded seismogram. Case II describes April 5, 1976 rock …

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Behavior Of Some Earth Dams On Liquefiable Soil, A. Popovici, V. Perlea, L. Corda May 1984

Behavior Of Some Earth Dams On Liquefiable Soil, A. Popovici, V. Perlea, L. Corda

International Conference on Case Histories in Geotechnical Engineering

The 1977 March 4 Vrancea earthquake emphasized several zones with liquefiable materials on Romanian territory. Some earth dams of such zones, placed to over 200 km from the earthquake epicenter were damaged. Important hydropower works are at present in different design or construction stages in such area, comprising long earth dams. The Seismic analysis procedure applied to their design was based on the finite element method. Some characteristic cross - sections of the earth dams in different versions have been studied. The analysed sections had different shapes (with and without stabilizing benches downstream) and included different zoning of the materials …

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Pile Foundations Under Liquefied Soils, Liu Huishan, Qiao Taiping May 1984

Pile Foundations Under Liquefied Soils, Liu Huishan, Qiao Taiping

International Conference on Case Histories in Geotechnical Engineering

The Tangshan and Haichen earthquakes gave engineers a chance to examine the aseismic behaviors of various structures and provided valued information for further revision of aseismic regulations. The results of investigation of pile foundations resting on potentially liquefied soils herein presented. In addition, some supplementary laboratory tests were also performed to clarify some phenomena. Based upon the investigation in situ and shaking table tests authors made some analysis and comments on pile foundation design in this paper.

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Post-Earthquake Failure Of A Tailings Dam Due To Liquefaction Of Pond Deposit, Kenji Ishihara May 1984

Post-Earthquake Failure Of A Tailings Dam Due To Liquefaction Of Pond Deposit, Kenji Ishihara

International Conference on Case Histories in Geotechnical Engineering

At the time of the Izu-Ohshima-Kinkai earthquake of January 15, 1978 in Japan, two darns retaining tailings from Mochikoshi gold mine failed, leading to a release of a large volume of tailings. One of the darns, No.1 dike, collapsed almost simultaneously with the shaking of the main shock, but another darn, No.2 dike, failed about 24 hours later at a time when there was no shaking. The failure of the No.1 dike is known to have been triggered by the liquefaction which developed in the tailings deposit in the impoundment pond. The cause of the failure in the No.2 dike …

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Seismic Motion Selection Criteria For Dam Design, G. Rodolfo Saragoni May 1984

Seismic Motion Selection Criteria For Dam Design, G. Rodolfo Saragoni

International Conference on Case Histories in Geotechnical Engineering

In recent years, new seismic design methods for earthdam, based on finite element have been used. These methods generally require selection criteria of seismic ground motion to be used for the design. Most standard criteria used are maximum ground acceleration and linear response spectra. These criteria fail to predict seismic dam response due to strong nonlinear soil behavior characterized by large permanent displacement, shear modulus degradation and damping increasing with shear strain deformation variation, increase of water pore pressure and large variation of natural period of dam. A criterion based on the potential destructiveness of earthquake motion is proposed. This …

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Seismic Response And Liquefaction Analysis By An Approximate Method, M. Hyodo, T. Yamanouchi, J. Hashizume May 1984

Seismic Response And Liquefaction Analysis By An Approximate Method, M. Hyodo, T. Yamanouchi, J. Hashizume

International Conference on Case Histories in Geotechnical Engineering

Presented is a simplified procedure for performing the dynamic effective stress analysis. An equivalent linear method is applied to the procedure. It is assumed, in this method, that the variations of the shear modulus and damping factor due to strain level and effective stress are independent one another. That is, firstly the total stress analysis is done in order to obtain the effective strain. Then the effective stress analysis is carried out and the moduli are varied due to the variation of the effective stress only. The accuracy of the result is checked by comparing it with that of nonlinear …

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Surface Damage Of Tangshan Earthquake And Characteristics Of Response Spectrum Of Ground Movement, S. D. Zhao, H. Q. Fang May 1984

Surface Damage Of Tangshan Earthquake And Characteristics Of Response Spectrum Of Ground Movement, S. D. Zhao, H. Q. Fang

International Conference on Case Histories in Geotechnical Engineering

The intensive ground movement of seismic region was an essential factor in causing ground damages. Damages in historical events signified that the extent of destruction not only conformed to the epicentral distance but also related to geomorphology, soil type and ground structure. Different combination of ground lithology may reflected directly the enhancement and attenuation of seismic wave during its propagation and it had also dominating influence on ground movement, different damages and seismic excitation of the same ground. Hence the amplitude and type of seismic response spectra were determined. In this paper, ground movement and damage feature on geomorphology units …

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The Role Of Case Studies In The Evaluation Of Soil Liquefaction Potential, H. Bolton Seed May 1984

The Role Of Case Studies In The Evaluation Of Soil Liquefaction Potential, H. Bolton Seed

International Conference on Case Histories in Geotechnical Engineering

Field evidence concerning soil liquefaction is reviewed and a number of case studies are summarized. Examples of the use of case studies in developing an understanding of the liquefaction phenomenon, both on level ground due to earthquake shaking and in slopes due to earthquake and static stress applications are presented.

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Dynamic Response And Static Analysis Of Rcc Space Frames Supporting High Speed Centrifugal Machines With Coupled Soil-Structure Interaction, Dilip K. Chakravorty, Dhiman K. Ghosh, H. N. Batavyal May 1984

Dynamic Response And Static Analysis Of Rcc Space Frames Supporting High Speed Centrifugal Machines With Coupled Soil-Structure Interaction, Dilip K. Chakravorty, Dhiman K. Ghosh, H. N. Batavyal

International Conference on Case Histories in Geotechnical Engineering

The paper reviews the current state of the art on the dynamic and static analyses of RCC space frames supporting high speed centrifugal machines e.g. large turbogenerators and compressors. The need to include the effects of soil-structure interaction formulations on overall behaviour of various analytical models are highlighted, At the same time, the uncertainties involved in evaluating essential geotechnical parameters and paucity of reliable and elaborate information from the machine manufacturers are discussed. The analysis and design aspects of this inter-disciplinary problem are illustrated with two typical design case studies selected from authors’ own experience in this specialised field. The …

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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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