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Articles 4441 - 4470 of 5012

Full-Text Articles in Engineering

Influence Of Pile Driving On Characteristics Of Liquefiable Soils, Qiao Taiping, Liu Huishan Jun 1988

Influence Of Pile Driving On Characteristics Of Liquefiable Soils, Qiao Taiping, Liu Huishan

International Conference on Case Histories in Geotechnical Engineering

This paper offers a case of pile foundation supporting a 18-storied building rested on liquefiable sandy layers. The soil densities and the bearing capacities of piles both increased after pile driving. It is suggested that the influence of densification caused by pile driving should be considered in the case of dense spacing and large amount of piles. The formulas for sand piles are suggested for primary estimation of densification effect of pile driving.

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In-Situ Determination Of Dynamic Properties Of Soil For Foundation Of A Turbo-Generator, V. D. Miglani Jun 1988

In-Situ Determination Of Dynamic Properties Of Soil For Foundation Of A Turbo-Generator, V. D. Miglani

International Conference on Case Histories in Geotechnical Engineering

The paper presents a case history of performance and analysis of results of vertical & horizontal resonance tests on a standard concrete block in a well, for in-situ determination of dynamic properties of soil required for design of a turbo-generator, under unusual conditions of high water table. Pumping from the two wells constructed for lowering the water level was not enough and pumping from within the main well had to be resorted to bring down the water level to a little below the top surface of the model block. As expected, amplitude versus frequency curves for vertical resonance test showed …

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Landslides In Rock Slopes During January 19, 1975, Kinnaur Earthquake In Himachal Pradesh, India, Lakshman Saran Srivastava Jun 1988

Landslides In Rock Slopes During January 19, 1975, Kinnaur Earthquake In Himachal Pradesh, India, Lakshman Saran Srivastava

International Conference on Case Histories in Geotechnical Engineering

Ground failures in rugged terrain with more than 10,000 ft (3000m) elevation above mean sea level in the epicentral tract of 19 January 1975 Kinnaur earthquake in Himachal Pradesh, India, indicate that most of the earthquake generated landslides occur in surficial cover. The collapse of such material on steep slopes often result in cascading rock avalanches obliterating roads and other constructions lying on its way. The accumulated debris during this earthquake dammed Parachu river creating a reservoir behind it. The dislodging, overturning and uplift of boulders on hill tops and scabing and slabing of rocks along joints and other weak …

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Model Tests On Seismic Stability Of An Approach Fill Embankment, Annacis Island Bridge Project, Vancouver, Canada, Peter M. Byrne, Hans Vaziri, Upul Atukorala, Donald Fraser Jun 1988

Model Tests On Seismic Stability Of An Approach Fill Embankment, Annacis Island Bridge Project, Vancouver, Canada, Peter M. Byrne, Hans Vaziri, Upul Atukorala, Donald Fraser

International Conference on Case Histories in Geotechnical Engineering

This paper describes a study performed to evaluate the seismic behaviour of a 10 m high bridge end sand fill placed upon soft organic foundation soils and supported on piles. Under static conditions the fill load is essentially carried by the piles by "arching action", and little deformation was observed to occur in the field. The results of both model tests and finite element analysis are in agreement with this finding. Concern arose as to the likely response of this structure under earthquake loading and a model sand embankment supported on 400 model piles was built and tested on the …

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Observed Natural Frequency Pile, Vijay K. Puri Jun 1988

Observed Natural Frequency Pile, Vijay K. Puri

International Conference on Case Histories in Geotechnical Engineering

Vertical and horizontal vibration tests were conducted on a 45 cm. diameter concrete driven pile. The pile length was 17 m. The response of the pile was computed following the commonly used approach of Novak (1974, 1977) and Novak and El-Sharnouby (1983). A comparison was made of the predicted and observed response, the results of which are discussed in the paper.

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On Propagation Of Elastic Surface Wave In Soils, Wang Xikang, Duan Shiwei, Yang Xianjinan Jun 1988

On Propagation Of Elastic Surface Wave In Soils, Wang Xikang, Duan Shiwei, Yang Xianjinan

International Conference on Case Histories in Geotechnical Engineering

It has been proved that the propagation law of elastic surface wave emanating from machinery foundations has bearing not only on distances from vibration source but also on frequencies and depth of vibration source and external pressure acting on soil surface of wave receivers. Based on plenty of tests the calculation formulas for elastic surface wave are put forward and the computation precision of which is satisfactory.

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On Properties Of Damping Of Bases, Wang Xikang Jun 1988

On Properties Of Damping Of Bases, Wang Xikang

International Conference on Case Histories in Geotechnical Engineering

On the basis of many tests it has been proved that the damping properties of bases not only have bearing on magnitude of base area of foundation but also on weight of foundation and on mechanics model adopted. This paper puts forward the computation formulas of damping parameters to some soils.

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Probabilistic Analysis Of Earthquake-Induced Pool Release, T. F. Wolff, G. L. Hempen, M. M. Dirnberger, B. H. Moore Jun 1988

Probabilistic Analysis Of Earthquake-Induced Pool Release, T. F. Wolff, G. L. Hempen, M. M. Dirnberger, B. H. Moore

International Conference on Case Histories in Geotechnical Engineering

Wappapello Dam was constructed in 1938 near the New Madrid seismic region. Loose sands in the dam foundation led to concern for liquefaction and embankment sliding if a large earthquake were to occur. However it was also recognized that the operation of the dam for flood control results in relatively low reservoir levels the majority of the time, substantially reducing the risk of earthquake-induced flooding. Because of these factors, a probabilistic analysis was performed to assess the likelihood of the combination of required events leading to an earthquake-induced pool release. Results of such analyses provide better information on which to …

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Reliability Of A Wave Equation Analysis In The Estimation Of Static Bearing Capacity Of A Vertical Pile--A Case Study, S. Bandyopadhyay, M. K. Gupta, A. S. Arya Jun 1988

Reliability Of A Wave Equation Analysis In The Estimation Of Static Bearing Capacity Of A Vertical Pile--A Case Study, S. Bandyopadhyay, M. K. Gupta, A. S. Arya

International Conference on Case Histories in Geotechnical Engineering

Application of wave equation, in the analysis of pile behavior, under dynamic loading has started with Smith [9]. This paper presents a modified explicit numerical scheme, based on Smith's approach, which retains the simplicity and minimum storage requirement of Smith's scheme but offers a faster and more accurate solution near critical time step. Bearing capacity of pile is estimated through Poulos [8) scheme, after evaluating dynamic properties of soil from set value through this modified scheme. Observed load test results establish a good promise for this analysis.

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Seismic Assessment Of Syncrude Tailings Dyke, R. C. Lo, W. G. Milne, Earle J. Klohn, G. T. Handford Jun 1988

Seismic Assessment Of Syncrude Tailings Dyke, R. C. Lo, W. G. Milne, Earle J. Klohn, G. T. Handford

International Conference on Case Histories in Geotechnical Engineering

This paper describes the assessment of seismic risk at the Syncrude Site. It reviews the site physiographic and geologic setting and considers the site position relative to observed seismic events, strain release patterns, and main tectonic features in western Canada. Both deterministic and probabilistic approaches were employed in the seismic risk assessment. Data on seismic events that occurred between 1899 and 1985 were included in the evaluation. Of particular importance was determination of the impact on the site of a series of large earthquakes which occurred in the Nahanni area of the Northwest Territories during 1985. Hasegawa et al. (1981) …

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Seismic Response Analysis Of Forebay Structure For Cw Pump House Of A Nuclear Power Project, Malay Basu Ray, Dhiman Kr. Ghosh Jun 1988

Seismic Response Analysis Of Forebay Structure For Cw Pump House Of A Nuclear Power Project, Malay Basu Ray, Dhiman Kr. Ghosh

International Conference on Case Histories in Geotechnical Engineering

The paper reviews the current state-of-the-art on the seismic response analysis of complex RCC structure like forebay which is usually connected with CW Pump House frame at its rear end for fulfilling circulating water requirement in power plant - nuclear or thermal. The need to include in such analysis and design effects of 3-Dimensional mathematical model and soil-structure interaction for studying overall behaviour of the structure are highlighted. The paper also discusses the usefulness, if any, of such rigorous analysis and identifies some problem areas in finalising realistic design data and adopting suitable models to represent the structural system.

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Seismosedimentation And Lives Of Reservoirs, Arun Bapat Jun 1988

Seismosedimentation And Lives Of Reservoirs, Arun Bapat

International Conference on Case Histories in Geotechnical Engineering

When moderate to major earthquakes, usually of magnitude more than or equal to 6. 0 on Richter Scale, occur in catchment area of river, additional amount of geological materials is generated, which is called as Seismosediments and the process is known as Seismosedimentation. River flow mechanism carries it down to reservoir. This amount of seismosediment is quantified by a mathematical relation. A specific case of seismosedimentation with reference to sediments in Bhakra reservoir has been discussed. It is observed that seismosedimentation could reduce the economic life of reservoir and adversely affects the utility of reservoir. Re-examination of lives of large …

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Soil Liquefaction Potential Of A Highway Bridge Foundation, Pedro S. Sêco E Pinto Jun 1988

Soil Liquefaction Potential Of A Highway Bridge Foundation, Pedro S. Sêco E Pinto

International Conference on Case Histories in Geotechnical Engineering

Dynamic properties of a highway bridge foundation were determined through extensive field and laboratory tests. The liquefaction potential of alluvia materials consisting of sand material with 10 m depth was evaluated by using field data obtained from standard penetration and cone penetration tests, as well as seismic tests by measuring longitudinal and shear waves velocities. In addition the laboratory testing program has included classification tests, cyclic triaxial and cyclic simple shear test. The analyses have showed that comparable factors of safety may be obtained from both field and laboratory tests.

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Some Experiences From Damages Of Embankments During Strong Earthquakes China, Shen Choggang Jun 1988

Some Experiences From Damages Of Embankments During Strong Earthquakes China, Shen Choggang

International Conference on Case Histories in Geotechnical Engineering

This paper gives a series of case histories of earth dams which have been damaged by strong earthquakes in the past 25 years in China. These damages include slides, cracks, settlements leakages and also some appurtenant structure failures. Experiences show it is necessary to stringently control the design and construction to resist earthquakes.

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Stability Analysis Of Seismically Damaged Embankments, Yasuyuki Koga, Osamu Matsuo Jun 1988

Stability Analysis Of Seismically Damaged Embankments, Yasuyuki Koga, Osamu Matsuo

International Conference on Case Histories in Geotechnical Engineering

This paper describes a pseudo-static stability analysis of seismically damaged embankments during the 1983 Nihonkai-chubu earthquake (Japan). It places a great emphasis on the discussion of a dynamic shear strength of soils to be used in a seismic stability analysis of embankments. Several existing concepts of a dynamic strength are reviewed, which vary from each other with respect to loading patterns, drainage conditions and strength criteria in soil element tests. The main part of this paper is to apply some of the dynamic soil strengths discussed above to seismic stability analyses of three embankment sections, laid on loose sandy deposits …

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Stress Field Under A Reservoir And Its Induced Earthquake, Tao Zhen-Yu, Tang Fang-Fu Jun 1988

Stress Field Under A Reservoir And Its Induced Earthquake, Tao Zhen-Yu, Tang Fang-Fu

International Conference on Case Histories in Geotechnical Engineering

This paper provides a conceptual model for the study of water-induced earthquake, from which a coupled analysis program of two-dimensional elasto-plastic media has been made. It analyzes the characteristics of the change of stress field and infiltration field under reservoir and studies the relationship between these characteristics and those of water-induced earthquake. At last, it gives out prediction results to a water-induced sequence.

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The Effect Of Foundation Shape On Dynamic Parameter Of Bases, Duan Shiwei Jun 1988

The Effect Of Foundation Shape On Dynamic Parameter Of Bases, Duan Shiwei

International Conference on Case Histories in Geotechnical Engineering

It has been proved that the shape of foundation and its base side ratio affect the dynamic rigidity of sliding-rotation vibration of bases. Based on plenty of laboratory tests in a small sides the computing formulas of rigidity and damping of base considering the effect of base side ratio are put forward.

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The Observed Seismic Behavior Of The Matahina Dam, M. D. Gillon Jun 1988

The Observed Seismic Behavior Of The Matahina Dam, M. D. Gillon

International Conference on Case Histories in Geotechnical Engineering

On 2 March 1987 the 86 m high Matahina earth dam in the Eastern Bay of Plenty region of New Zealand was shaken by a nearby magnitude 6.3 earthquake. The dam response was recorded by five strong motion accelerometers and a maximum crest level acceleration of 0.42 g was measured. The crest level rockfill settled about 100 mm and moved downstream 250 mm during the earthquake. No major leakage has resulted from the earthquake. The results of the damage investigations are described. A condition probably requiring remedial work has been identified on the left abutment.

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The Simplified Formulas For Predicting Seismic Liquefaction Of Saturated Clayey Silt Site, Wang Yuqing Jun 1988

The Simplified Formulas For Predicting Seismic Liquefaction Of Saturated Clayey Silt Site, Wang Yuqing

International Conference on Case Histories in Geotechnical Engineering

In the reconstruction of old factories and in the small scale engineering, it is often taken place that the present methods for predicting liquefaction of clayey silt could be not used for lack of subsoil exploration data. Two simplified formulas which contain the coefficient of αPc considering the effect of clay content Pc and the coefficient of αIp considering the effect of plasticity index Ip are presented for predicting seismic liquefaction of saturated clayey silt. Thus, the prediction of liquefaction of clayey silt could be effectively proceeded under the conditions lacking of analysing data of soil grain composition.

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Theory And Experiment Of Hammer Foundation Vibration, Pan Fulan Jun 1988

Theory And Experiment Of Hammer Foundation Vibration, Pan Fulan

International Conference on Case Histories in Geotechnical Engineering

The foundation of 1~16t hammer have been calculated with five calculation models and compared with the test data of the foundation and anvil for the hammer 1t, 2t, 3t, 5t, 10t and 16t built on the loess clayey loam stratum. The results show: (1) In the design of hammer foundation, calculation with model of two-degree-freedom and damped agrees rather better with the actual measurement. (2) The coefficient of subgrade compression rigidity increases with the increase of the depth of soil stratum. Both accurate calculations of the coefficient of subgrade compression rigidity and effected depth under the hammer foundation are most …

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Upgrading The Seismic Resistance Of Stevens Creek Dam, K. V. Rodda, C. W. Perry, R. E. Tepel Jun 1988

Upgrading The Seismic Resistance Of Stevens Creek Dam, K. V. Rodda, C. W. Perry, R. E. Tepel

International Conference on Case Histories in Geotechnical Engineering

Stevens Creek Darn is a rolled earthfill structure with a height of about 120 feet. A seismic safety evaluation in 1978 concluded that the darn would probably be severely damaged if subjected to a maximum credible earthquake originating on the nearby San Andreas fault. Normal reservoir operation was immediately restricted, pending decisions as to the fate of the project. Conceptual design studies were completed in 1982 to identify the most promising alternative remedial concepts. The most promising concepts were chosen and final design of modifications to the dam and its appurtenant hydraulic structures were completed in 1984. Modification of the …

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Vibration Response Of Railway Bridge Piers To Nearby Pile Driving, I. Rosenthal, M. Itskowitch Jun 1988

Vibration Response Of Railway Bridge Piers To Nearby Pile Driving, I. Rosenthal, M. Itskowitch

International Conference on Case Histories in Geotechnical Engineering

In the development of a new highway system approaching Tel Aviv, Israel, long piles had to be driven very close to an existing railway bridge. In view of the danger of structural damage to the bridge, as a result of ground vibrations excited by the pile-driving work, field measurements were ordered. Vibrations recorded at the bridge pier heads in the course of the driving operation were analyzed and compared with those excited by trains. Results showed that the former are generally lower than the latter, and neither one exceeds the limits prescribed by the codes.

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A Foundation Failure In Philadelphia, W. B. Fergusson, E. F. Glynn Jun 1988

A Foundation Failure In Philadelphia, W. B. Fergusson, E. F. Glynn

International Conference on Case Histories in Geotechnical Engineering

The foundation failure of the 22 story, steel framed, federal courthouse in Philadelphia occurred because of an inadequate geotechnical assessment of a complex geological condition. The founding elevations for caissons were improperly determined on materials that could not sustain the design load. This condition was further complicated by the presence of groundwater and poor concrete construction practices. These conditions resulted in an extensive and costly remedial measures which included a grouting program and the replacement of 14 faulty caissons.

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A Soil-Structure Interaction Analysis Of A Damaged Building, R. F. Wilson-Fahmy Jun 1988

A Soil-Structure Interaction Analysis Of A Damaged Building, R. F. Wilson-Fahmy

International Conference on Case Histories in Geotechnical Engineering

A twenty years old reinforced concrete building suffered from fracture of one of its ground floor corner columns. The extent of damage resulting from fracture of the column is examined. Plane frame structural analysis is used in the interpretation of the signs of damage of the building. Soil compressibility is incorporated in the analysis by assuming the footings to rest on Winkler type subgrade. The theoretical analysis is assessed by comparing the results with the actual behaviour of the structure.

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Actual And Predicted Behavior Of Large Metal Culverts, David C. Cowherd, Stephen M. Thrasher, Vlad G. Perlea, John O. Hurd Jun 1988

Actual And Predicted Behavior Of Large Metal Culverts, David C. Cowherd, Stephen M. Thrasher, Vlad G. Perlea, John O. Hurd

International Conference on Case Histories in Geotechnical Engineering

The stability of large metal culverts depends on the performance of the backfill around the pipe, which must be considered as a part of the structure when evaluating its safety. A simplified method to evaluate the current stability of such a structure on the basis of the structure's shape is derived. Useful when limited amount of information is available, this method provides an economical procedure for: (1) evaluating the condition of the existing backfill and its capability to provide a safe support for the structure; (2) predicting final movements and determining if additional investigations are necessary to establish the safety …

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Anchor Failures At A Deep Excavation, Vinod K. Garga Jun 1988

Anchor Failures At A Deep Excavation, Vinod K. Garga

International Conference on Case Histories in Geotechnical Engineering

The Paper describes failures of some high tensile strength steel tensioned rock anchors at a deep excavation. The failures are attributed to stress corrosion to which the high tensile strength steel is particularly susceptible. The method which was used to estimate the life of remaining anchors on the project is described. The need for ensuring a high level of care during transportation, storage and installation of such high tensile strength steel bars is emphasised.

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Anchored Bulkhead Failure On The Arabian Gulf, Jonathan J. Grosch, Khalifa S. Al-Yahyai Jun 1988

Anchored Bulkhead Failure On The Arabian Gulf, Jonathan J. Grosch, Khalifa S. Al-Yahyai

International Conference on Case Histories in Geotechnical Engineering

A 1500-m long anchored bulkhead with a height of 20m exhibited a localized failure in the form of broken and overstressed anchors several months after construction. The wall had not yet been subjected to its full design loadings. The soil conditions in the failure area differ from those occurring along the rest of the quay wall by the presence of a very soft silt/clay layer, and during construction the wall had been strengthened in this area. Post-failure analysis of the anchored bulkhead indicated that the primary cause of the failure was overly optimistic design assumptions for the strength of the …

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Bearing Capacity Of Pile Foundations, Xie Sheng-Sun Jun 1988

Bearing Capacity Of Pile Foundations, Xie Sheng-Sun

International Conference on Case Histories in Geotechnical Engineering

This paper deals with the case histories about the bearing capacity of piles in an off shore thermal power plant, it includes: (1) The exploring of the site and the setting of the data in pile foundation design. (2) Static load test of inclined piles with deviations ranging from 3 to 10 degrees from vertical.

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Behavior Of Buried Concrete Box Culvert, Y. S. Kim, P. Y. Thompson Jun 1988

Behavior Of Buried Concrete Box Culvert, Y. S. Kim, P. Y. Thompson

International Conference on Case Histories in Geotechnical Engineering

The centrifuge model technique is used to evaluate the behavior of a 5-in. X 5-in. concrete box culvert under a 4-in. backfill soil. Two different types of soil installations are studied: embankment and trench. Results of the centrifuge model study for both installations are compared with each other, and with predictions of a finite element code, CANDE (Culvert ANalysis and DEsign). Furthermore, the influence of soil stiffness for backfill is studied. The results of CANDE analyses including a nonlinear constitutive model for characterizing soil and incremental construction w1th a symmetric mesh are reported.

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Behavior Of Ground Anchors For Taipei Sedimentary Soils, J. C. Li, H. L. Yao, L. P. Shi, B. I. Shy Jun 1988

Behavior Of Ground Anchors For Taipei Sedimentary Soils, J. C. Li, H. L. Yao, L. P. Shi, B. I. Shy

International Conference on Case Histories in Geotechnical Engineering

Seven ground anchors were installed for full scale field tests in Taipei Railway Underground Project. The soil at job site can generally be classified as silty clay or clayey silt. The length of the anchors was about 40 m each, including 23 m bond length. The borehole diameter was 125 mm and the designed borehole inclination was 26 degrees downward. Each of the anchors was expected to share approximately 300 to 400 kN of tie-back force to support the diaphragm wall during excavation. Investigation of the borehole inclination was carried out by using horizontal inclinometer. The distribution of skin friction …

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