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Articles 3931 - 3960 of 4582

Full-Text Articles in Engineering

Kerrville Ponding Dam, Guadalupe River, Texas, W. R. Stroman, R. R. W. Beene, P. D. Thornhill Jun 1988

Kerrville Ponding Dam, Guadalupe River, Texas, W. R. Stroman, R. R. W. Beene, P. D. Thornhill

International Conference on Case Histories in Geotechnical Engineering

Kerrville Ponding Dam is a relatively small channel dam in the Guadalupe River in Kerrville, Texas. The dam is 22 feet (6.7M) high and 600 feet (183M) long and provides a water supply for the City of Kerrville. The dam was constructed during 1979-1980. Seepage problems in the abutments were observed during the initial filling of the reservoir. Some minor corrections to the problems were made at that time. In June 1981, after a moderate flood flow passed over the dam, additional seepage problems occurred. The downstream slope protection was displaced to the extent that cracks appeared in the concrete. …

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Lessons Learned From Case Histories Performance Of Earth Dams, Embankments, And Natural Slopes, M. L. Silver, R. Riccioni Jun 1988

Lessons Learned From Case Histories Performance Of Earth Dams, Embankments, And Natural Slopes, M. L. Silver, R. Riccioni

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Monitoring Of The Canales Dam And Its Control During Construction Period, Javier Andreu Posse, Rafael Portilla Hermosilla, J. M. Martínez Santamaría Jun 1988

Monitoring Of The Canales Dam And Its Control During Construction Period, Javier Andreu Posse, Rafael Portilla Hermosilla, J. M. Martínez Santamaría

International Conference on Case Histories in Geotechnical Engineering

This paper presents a study of the stress-deformation behaviour of the Canales Dam (Granada) during construction. The basis for this study has been the three dimensional (3D) finite elements method with hyperbolic material response. The analytical procedure used is presented and the study concludes with a comparative study of the results obtained from the calculation programme used and monitoring system's measurements.

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Openpit Mine Slope Stability – A Case Study, V. K. Singh, B. D. Baliga, B. Singh Jun 1988

Openpit Mine Slope Stability – A Case Study, V. K. Singh, B. D. Baliga, B. Singh

International Conference on Case Histories in Geotechnical Engineering

For profitability steep overall slope angle is essential for openpit mines without endangering the safety for the life time of the pit. Openpits have been designed to depths of 150 to 200 metres. For optimum slope angles of the footwall and the hanging wall of a rock phosphate mine, near Udaipur, Rajasthan , geotechnical investigation covering discontinuity mapping, analysis of data, testing of geo-mechanical properties in laboratory and in in-situ condition were conducted. Slope monitoring was done by precise surveying instruments to give advance warning of impending ground movement. On the basis of geotechnical studies the mine has been designed …

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Penitas Dam – In Situ Stress-Strain Characteristics Of Materials, Jesús Alberro, Gabriel Macedo, Luis Montañez, Francisco González-Valencia Jun 1988

Penitas Dam – In Situ Stress-Strain Characteristics Of Materials, Jesús Alberro, Gabriel Macedo, Luis Montañez, Francisco González-Valencia

International Conference on Case Histories in Geotechnical Engineering

The deformability properties of all the materials of Penitas Dam (43-m high) are estimated based upon the measurement of total stresses, pore pressures and strains by means of the instrumentation placed inside the embankment. The results of these measurements indicate that all the materials show octahedral stress-octahedral strain cuasilinear relationships as if they were elastic. The values of the deformability moduli E and the Poisson's ratios v computed from these relationships are compared with the moduli E obtained by means of confined plate bearing tests made in situ during construction of the dam, and are also used to feed a …

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Performance Of An Earthdam And Cut-Off Through Deep Alluvium, N. H. Wade, L. F. Wei, L. J. Courage, R. A. Keys Jun 1988

Performance Of An Earthdam And Cut-Off Through Deep Alluvium, N. H. Wade, L. F. Wei, L. J. Courage, R. A. Keys

International Conference on Case Histories in Geotechnical Engineering

The main dam at the Bighorn development consists of a zoned earthfill embankment with a concrete cut-off wall constructed through the river alluvium by the slurry trench technique. Upon first filling of the reservoir in 1972, erratic drops in piezometric heads in the alluvium upstream of the cut-off and significant downstream leakage prompted the construction of a weight berm at the downstream toe and implementation of a program of regular monitoring of all piezometers and seepage measuring facilities. Concern for the integrity of the structure was not allayed until completion of a dam safety evaluation in 1984. The paper summarizes …

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Problems And Behaviour Of A Dam Founded On A Weak Zone, K. V. Rupchard Jun 1988

Problems And Behaviour Of A Dam Founded On A Weak Zone, K. V. Rupchard

International Conference on Case Histories in Geotechnical Engineering

Any fault in the foundation of a dam presents a problem which has to be tackled in the proper way considering many aspects. This paper deals with such a foundation problem faced at Upper Aliyar Dam in South India in the shape of a weak zone. Several alternatives were thought of for tackling the weak zone. Ultimately a simple concrete plug with cut-offs was adopted considering the limited working season available and the fairly good in-situ compressive strength of the weak material. This was in preference to a raft foundation or a massive arch. The methods adopted for tackling the …

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Remedial Measures To Seepage And Instability Aspect Of A Dam Near Bombay, R. K. Katti, Dinesh R. Katti, Anand R. Katti Jun 1988

Remedial Measures To Seepage And Instability Aspect Of A Dam Near Bombay, R. K. Katti, Dinesh R. Katti, Anand R. Katti

International Conference on Case Histories in Geotechnical Engineering

The paper describes the distress caused to a minor earth dam constructed at a high elevation in a mountainous area to conserve water. The distress related to instability of the dam and also due to high percolation underneath the dam coupled with formation of piping. The remedial measures taken to rectify instability and reduce percolation are described in this paper.

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Restoration Of The Stability Of Retaining Wall, T. K. Natarajan, P. Jagannatha Rao Jun 1988

Restoration Of The Stability Of Retaining Wall, T. K. Natarajan, P. Jagannatha Rao

International Conference on Case Histories in Geotechnical Engineering

The paper sets out the salient features concerning the failure of a retaining wall on a sloping ground. The retaining wall experienced a displacement of about l.50 m both in the downward and outward directions without experiencing any tilt or structural distress. The stability analysis of the slope on which the retaining wall was located, established that the failure was caused by inadequate drainage of the fill resulting in a build up of pore pressures. Four more such retaining wall sections were also analysed. The remedial measures consist of providing adequate drainage using a geotextile - covered filter drain, use …

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Seepage Problems And Remedies – Hub Dam, Izhar-Ul-Haq Jun 1988

Seepage Problems And Remedies – Hub Dam, Izhar-Ul-Haq

International Conference on Case Histories in Geotechnical Engineering

On the first impounding of Hub Dam, seepage problems started. The foundation piezometers showed rising pressures. The areas of concern were limestone, bed rock, jointed sandstone and gravel deposits at overburden-rock contact. Observational approach was followed. It was decided to fill the reservoir in stages. Various alternatives were considered to control the underseepage pressures. Relief Wells were installed which proved effective and economical to control the problem. A gravel shell was added on the downstream slope to enhance the stability of the homogeneous section in case of seepage through the body of the dam.

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Settlement Measurements Of Peat Deposits As Embankment Foundation, K. Kogure, K. Matsuo Jun 1988

Settlement Measurements Of Peat Deposits As Embankment Foundation, K. Kogure, K. Matsuo

International Conference on Case Histories in Geotechnical Engineering

A low test embankment have been constructed on a soft and fibrous peat deposits. The thickness of the soft peat layer is about 2.5 m. Under the peat layer, there is silty clay deposit with thickness of about 13m. The site investigations were performed for both the layers. The laboratory soil tests on undisturbed samples obtained from both the layers were carried out. The settlement of foundation deposits was predicted by the one dimensional consolidation theory using the soil parameters obtained from laboratory soil tests. The results of field observations were compared with the calculated results by the conventional theory. …

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Testing Of The Homestake Mine Tailings Deposit, Donald R. East, John W. Ransone, William A. Cincilla Jun 1988

Testing Of The Homestake Mine Tailings Deposit, Donald R. East, John W. Ransone, William A. Cincilla

International Conference on Case Histories in Geotechnical Engineering

This paper discusses the geotechnical investigation of a large gold tailings facility which has been in operation since December 1977. The very thorough test program included 670 m (2200 ft.) of piezocone probing, 65 self-boring pressuremeter tests down to a maximum of 35 m (118 ft.), 60 SPT's and 9 laboratory triaxial tests as well as a well pump test. The study included a detailed geological and seismic study to determine earthquake design parameters and to assess the liquefaction potential of the deposit. Test results were utilized to determine the stability of an upstream constructed embankment employing the sub-aerial method …

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The Failure And The Remedial Containment Dike On A Lacustrine Clay, Chitta R. Gangopadhyay, Richard O. Anderson Jun 1988

The Failure And The Remedial Containment Dike On A Lacustrine Clay, Chitta R. Gangopadhyay, Richard O. Anderson

International Conference on Case Histories in Geotechnical Engineering

A compacted silty clay containment dike for a waste slurry holding pond, with a design height of 44 ft. above the pond bottom experienced distress when the construction had reached heights ranging from only 16 to 21.5 ft. The rapid construction rate generated large excess pore water pressure in the saturated lacustrine clay subgrade, the fissured nature of which could not be discerned by the standard sampling and laboratory testing procedures. Lateral transmission of the excess pore pressure caused toe heave and cracking of the dike. Construction was halted and resumed next year. Construction was completed with monitoring of the …

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The Great Salt Lake Causeway – A Calculated Risk Revisited, James R. Lambrechts, Edward B. Kinner Jun 1988

The Great Salt Lake Causeway – A Calculated Risk Revisited, James R. Lambrechts, Edward B. Kinner

International Conference on Case Histories in Geotechnical Engineering

The construction of the Great Salt Lake Causeway involved several calculated risks. Original design assumptions on lake level and consolidation settlement were not realized, creating a unique situation where the critical time for stability of this embankment was not necessarily at the end-of-construction. Along more than half of the causeway's 12-1/2 mile length, consolidation and strength gain has apparently been inhibited by a layer of salt. Because it was anticipated that calculated Factors of Safety for current conditions would be close to the 1.0 originally used, a comparative approach to stability evaluations was adopted. In this approach, Factors of Safety …

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Treatment Of Left Bank Slopes Of Ichari Dam, Bhagwat V. K. Lavania Jun 1988

Treatment Of Left Bank Slopes Of Ichari Dam, Bhagwat V. K. Lavania

International Conference on Case Histories in Geotechnical Engineering

The left bank of Ichari Diversion Dam was anticipated unstable because of toe submergence and drawdown effects after the construction of the dam, on the weak geological formations. Extensive laboratory and field investigations were carried out to determine the extent of stabilising measures needed. The proposals of providing pretensioned steel anchors or alternatively, reinforced concrete shaft anchors were considered in details to obviate the possibility of deep seated slides. The choice fell in favour of R.C. anchors mainly because there is no uncertainty about their in situ strength. These anchors were provided in two rows (one having vertical and other …

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Wadi Qattarah Dams Case History, Jean Binquet, Ugo Zappi Jun 1988

Wadi Qattarah Dams Case History, Jean Binquet, Ugo Zappi

International Conference on Case Histories in Geotechnical Engineering

Two earthfill dams were constructed on the Wadi Qattarah in Libya between 1969 and 1972 but the filling was never ach1eved for both dams. After a partial filling well below normal water level, Secondary Dam failed in December 1977. Several weaknesses may be found in the features of both dams and have been analyzed by the authors on the basis of dam instrumentation results, measurements and observations of the Secondary Dam failure. Several possible causes of failure of this dam are presented. No one can however be taken as certain. The series of events as reported by eye witnesses appear …

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A Study Of Dynamic Pile-Soil Interaction, P. Srinivasulu, N. Lakshmanan, K. Muthumani, B. Sivarama Sarma Jun 1988

A Study Of Dynamic Pile-Soil Interaction, P. Srinivasulu, N. Lakshmanan, K. Muthumani, B. Sivarama Sarma

International Conference on Case Histories in Geotechnical Engineering

The paper discusses briefly the state of art on the subject of pile dynamics including consideration of soil-pile interaction. An analytical model which gives the response of a single pile buried in a layered soil medium considering variation in soil properties in the radial direction in each layer is illustrated. The paper also presents an experimental study on a full size test pile 40 cm dia and 7 m long driven into a five layered soil stratum. The results of the analytical and experimental studies are compared and suggestions for further work are given.

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Analysis And Measurement Of Foundation Vibrations At Two Compressor Stations In Yugoslavia, Predrag Kvasnička, Tomislav Ivšić, Aleksandar Klričenko Jun 1988

Analysis And Measurement Of Foundation Vibrations At Two Compressor Stations In Yugoslavia, Predrag Kvasnička, Tomislav Ivšić, Aleksandar Klričenko

International Conference on Case Histories in Geotechnical Engineering

The design procedure and the measurements of foundation vibrations at two compressor stations are presented. Simple methods and models were used to predict machine foundation behavior-and it is shown that they were effective in estimating the expected range of amplitudes through simple parameter variation. In attempt to lower vibrations amplitudes, spreading of gravel layer under machine foundation was suggested, the effect of which is discussed in the paper.

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Case History Of Seismic Base Isolation Of A Building –The Foothill Communities Law And Justice Center, Marshall Lew, John C. Bowman Jr. Jun 1988

Case History Of Seismic Base Isolation Of A Building –The Foothill Communities Law And Justice Center, Marshall Lew, John C. Bowman Jr.

International Conference on Case Histories in Geotechnical Engineering

The Foothill Communities Law and Justice Center, located in seismically active Southern California, is the first building in the United States to be base isolated for seismic resistance. Natural rubber isolators with layers of steel plates were used to make the fundamental period of vibration of the base isolated building about twice as long as that for a comparable conventional fixed base building. Most earthquake energy is present in the shorter period ranges, and at longer periods, a building should be subjected to less earthquake input; this will allow buildings to be designed more economically and increase the likelihood of …

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Characterization Of Liquefaction Sites/Features In The Charleston, S. C. Area, Garry Maurath, David Amick Jun 1988

Characterization Of Liquefaction Sites/Features In The Charleston, S. C. Area, Garry Maurath, David Amick

International Conference on Case Histories in Geotechnical Engineering

The Charleston, South Carolina earthquake of August 31, 1886 produced numerous liquefaction features. To date, over one hundred liquefaction sites have been identified. The characteristics of these sites were determined, and compared to those reported for worldwide cases of liquefaction. The findings of this investigation support the generally accepted models for the types of material and the hydrogeologic setting that are required for liquefaction to occur. However in contrast to some previous studies, these investigations identified relatively few liquefaction sites in Late Holocene sediments. Rather, most liquefaction sites identified in the Charleston area are located in deposits that are 100,000 …

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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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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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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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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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