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Articles 34591 - 34620 of 40073

Full-Text Articles in Civil and Environmental Engineering

A Case Study Of Success To Structures Founded On Expansive Soils, Zhang Shixuan Jun 1988

A Case Study Of Success To Structures Founded On Expansive Soils, Zhang Shixuan

International Conference on Case Histories in Geotechnical Engineering

Since 1979, in accordance with the design program given by the author, no more than ) storied buildings with an areas of more than 200,000 square metres have been built in the expansive soil area of Guangxi Zhuang Autonomous Region and Guangdong Province in South China. The different measures have been adopted according to specification of light, medium and heavy expansive soil. Through the test of special weather and the deformation observation for 3 to 7 years, it has been proved that the intact rate of the buildings has reached 90-98 percent. This paper mainly expounds three cases and has …

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A Finite Element Analysis Of The Utah "Thistle" Failure, Blaine D. Leonard, Joseph M. Olsen Jun 1988

A Finite Element Analysis Of The Utah "Thistle" Failure, Blaine D. Leonard, Joseph M. Olsen

International Conference on Case Histories in Geotechnical Engineering

In the Spring of 1983, a large landslide occurred near the town of Thistle, Utah which blocked major transportation routes and impounded the Spanish Fork River, inundating the town with 200 feet of water. While much attention has been given to the slide and its impact, very little has been directed toward a quantitative understanding of its causes. An analysis was performed of the Thistle landslide using the SEEPSLOPE finite element system in order to evaluate the mechanisms, factors, and causes of the failure. An elastic, perfectly-plastic stress-strain curve was employed in the analysis to model the behavior of the …

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Behaviour Of Inginimitiya Embankment Dam, T. Sivapatham Jun 1988

Behaviour Of Inginimitiya Embankment Dam, T. Sivapatham

International Conference on Case Histories in Geotechnical Engineering

The prominent component of the Inginimitiya Reservoir Project is the Inginirnitiya Darn, This dam with a maximum height of 58 ft. is essentially a homogeneous earthfill embankment except for the slope protection, filter and drainage arrangement. The cut-off for the foundation seepage and the provisions made in the design for seepage control are described in this paper. The reservoir when partially impounded for the first time in 1983 "boiling" (bubbling with fines heaving up) was observed on the downstream at different locations close to the toe of the embankment between chainages 71 and 75. This reach when investigated revealed the …

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Case History Of A Partially Underground Power House, K. K. Kapoor, S. C. Patodiya Jun 1988

Case History Of A Partially Underground Power House, K. K. Kapoor, S. C. Patodiya

International Conference on Case Histories in Geotechnical Engineering

In the normal rock conditions, conventional type surface power houses have been built, whereas in structurally sound rock with sufficient rock cover, underground power houses have been attempted in India. The geological uncertainties plays major role in deciding the type of power house at a particular site. While in the surface type conventional power house huge excavation and concreting are involved, the access to the power house involves major work in the case of underground power house. There are very little examples when semi underground type of power houses have been attempted in India. The Mahi power house-II of Rajasthan …

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Case Studies On Long-Term Settlement Of Soft Clay Ground, Yoshihiko Tanabashi, Hidetoshi Ochiai, Yoshinori Saitoh, Kazuya Yasuhara Jun 1988

Case Studies On Long-Term Settlement Of Soft Clay Ground, Yoshihiko Tanabashi, Hidetoshi Ochiai, Yoshinori Saitoh, Kazuya Yasuhara

International Conference on Case Histories in Geotechnical Engineering

Two case histories on long-term settlements of Ariake clay which is counted as one of the soft clays in Japan are described. The one of them is to report the settlement which have been observed over 25 years since construction of embankment for breakwater on the coastal Ariake deposit. The another case history is concerned with the settlement of low embankment highway on Ariake clay whose shallow surface was improved by quickline-clay mixture as a countermeasure for the settlement. The current paper is featured by the fact that the predominant secondary settlement is common with two case histories. The finite …

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Coastal Bluff Retreat At Big Lagoon, California, R. C. Chaney, D. C. Tuttle Jun 1988

Coastal Bluff Retreat At Big Lagoon, California, R. C. Chaney, D. C. Tuttle

International Conference on Case Histories in Geotechnical Engineering

Big Lagoon, located 30 miles north of Eureka, California is formed behind a bay barrier built across the mouth of a drowned river valley. To the south of the bay the beach follows rising wave cut slightly cemented sand and gravel sea cliffs and terminates at the south end of Agate Beach. The retreat of these sea cliffs and its effect on property development along the top of the cliff is the focus of the paper. Measurements of bluff retreat in this area have been documented extensively from November 1941 to March 1986 through ground surveys and air photos. Review …

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Investigation Of Settlements Of A Trunk Road Embankment In Hong Kong, P. L. R. Pang, Y. C. Chan Jun 1988

Investigation Of Settlements Of A Trunk Road Embankment In Hong Kong, P. L. R. Pang, Y. C. Chan

International Conference on Case Histories in Geotechnical Engineering

A 25 m high fill embankment was constructed as part of a Trunk Road scheme in Hong Kong. In June 1985, large settlements of the order of 250 mm were observed in the embankment. This was followed by a local slippage of surface material from the downstream slope face. To meet the schedule for opening the trunk road in late September, a number of emergency measures costing about HK$1 M (US$0.13 M) were implemented to stabilize the embankment. An investigation was subsequently carried out to assess the cause of the movement and the long term stability of the embankment. This …

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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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Improvement Of Mechanical Properties Of Soft Soils By Use Of A Pre-Loading Embankment, F. Colleselli, P. Simonini, M. Soranzo Jun 1988

Improvement Of Mechanical Properties Of Soft Soils By Use Of A Pre-Loading Embankment, F. Colleselli, P. Simonini, M. Soranzo

International Conference on Case Histories in Geotechnical Engineering

A preloading embankment, and its foundation soil, have been closely monitored in the Po river delta (Italy). After showing that the complete consolidation of the peaty and clayey soil has taken place, the shear strength increase measured with various tests has been considered and analyzed.

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Overview Of Highland Valley Tailings Storage Facility, M. D. Scott, E. J. Klohn, R. C. Lo, Ken K. Lum Jun 1988

Overview Of Highland Valley Tailings Storage Facility, M. D. Scott, E. J. Klohn, R. C. Lo, Ken K. Lum

International Conference on Case Histories in Geotechnical Engineering

This paper presents key features of the Highland Valley tailings storage facility comprising two tailings dams, a 107 m high H-H Dam and a 166 m high L-L Dam. The construction history to date including instrumentation observations is also reviewed. Although the tailings facility is situated in a low to moderate seismic area within the Interior Plateau of British Columbia, potential earthquake sources that might have an impact on the site have been carefully assessed. Both dams are designed to have adequate seismic resistance against design earthquakes appropriate for the site. The L-L Dam valley section, involving soft lacustrine deposits …

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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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Performance Of An Instrumented Earth Dam With Fat Clay Core, T. S. Mathur, R. M. Willis Jun 1988

Performance Of An Instrumented Earth Dam With Fat Clay Core, T. S. Mathur, R. M. Willis

International Conference on Case Histories in Geotechnical Engineering

Heavily instrumented dams are unusual in the Midwestern United States. Council Bluff Dam, Missouri, USA has an embankment that provides monitoring by piezometers, inclinometer, settlement plates, earth pressure cells, extensometers, tiltmeters, and datum plates. The collection, evaluation, and discussion of the data and instruments give insight into embankment performance. Emphasis has been placed on monitoring after construction.

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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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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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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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Underseepage Control Measures At Painted Rock Dam, L. Knuppel, F. Mclean, A. Roodsari Jun 1988

Underseepage Control Measures At Painted Rock Dam, L. Knuppel, F. Mclean, A. Roodsari

International Conference on Case Histories in Geotechnical Engineering

Painted Rock Dam, a 181 ft (55.2 m) high, zoned earth embankment detention structure near Gila Bend, Arizona, retained approximately 2.3 million acre ft (2.8 x 109m3) of water for an extended period during the winter of 1978- 1979. Several areas of seepage developed over major portions of the downstream valley and in a minor area on the right abutment. These areas were monitored while instrumentation was installed and investigations made to determine the nature of the seepage and provide the basis for evaluation of structural performance and design of necessary relief and control measures. Construction …

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Unusual Behaviour Of An Earth-Rockhill Dam, D. Abolhassani, F. Bahrami-Samani, R. P. Brenner Jun 1988

Unusual Behaviour Of An Earth-Rockhill Dam, D. Abolhassani, F. Bahrami-Samani, R. P. Brenner

International Conference on Case Histories in Geotechnical Engineering

The post-construction behaviour of a 47.5 m high and 700 m long earth-rockfill dam, located in northwestern Iran, is described. The embankment dam is founded on Tertiary rock on both abutments, but in the river channel it rests on alluvial deposits of variable composition and thickness. Since the first impoundment, the dam has undergone large deformations, both in vertical and in horizontal directions. These have resulted in unusual differential settlements, visible along the crest, and have produced wide longitudinal cracks in the asphalt pavement of the crest road. The principle features of the dam are described and selected monitoring results …

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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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Dynamic Response Of An Actual Hammer Foundation, A. S. Arya, S. Saran, S. Bandyopadhyay Jun 1988

Dynamic Response Of An Actual Hammer Foundation, A. S. Arya, S. Saran, S. Bandyopadhyay

International Conference on Case Histories in Geotechnical Engineering

During the operation of Hammers and other shock producing machines, strong dynamic effects are generated which depend on the interaction between the different elements of the system. A simple two-degree of freedom system comprising of mass and spring, may offer reasonable result. Better result may be obtained by Wave Equation approach. This paper compares these two numerical schemes with the observed behavior of one Belt-drop stamping hammer.

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Geotechnical Services For A Bridge In A Seismic Area, Filippo Ciuffi Jun 1988

Geotechnical Services For A Bridge In A Seismic Area, Filippo 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 the geotechnical investigations and foundation design for a bridge in a seismic area, in the south of Italy. Particular attention is given to the procedure followed to study dynamic soil-pile interaction. Also described in summary fashion are a number of “borehole shear tests” carried out and their results.

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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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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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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 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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