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Articles 177421 - 177450 of 197991

Full-Text Articles in Engineering

Leakage At Upper Mun Dam, Nibondh Saihom, Ruongrit Ammawat, Mondhian Kangsasitiam Jun 1993

Leakage At Upper Mun Dam, Nibondh Saihom, Ruongrit Ammawat, Mondhian Kangsasitiam

International Conference on Case Histories in Geotechnical Engineering

The Upper Mun Dam located In Nakom Ratchaslma, the Northeastem Province of Thailand, intercepts a catchment area of 454 sq. kms. It is a zone earth dam with 32.7 meters of maximum height and 880 meters in length. The foundation strata comprises alluvial deposits overlying sandstone and siltstone. The chute spillway is designed for probable maximum flood of 950 m3/sec. and the outlet conduit is 1.84 by 1.84 meters caters for a maximum outflow of 11.2 m3/sec. No foundation treatment was carried out except cement grouting beneath the spillway and the outlet. The dam was completed …

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Residual Strength Parameters From A Slope Instability, P. Carrubba, N. Moraci Jun 1993

Residual Strength Parameters From A Slope Instability, P. Carrubba, N. Moraci

International Conference on Case Histories in Geotechnical Engineering

The study attempts to determine the in situ shear strength parameters of a stiff clay from a back analys1s of a well documented landslide. The relatively small extension of the instability, as well as the homogeneity of the clay formation and the defined slip surface, allows a consistent evaluation of shear strength parameters. The study is also supported by ring shear tests, and microscopic analysis performed on undisturbed thin sections, by means of scanning electron microscopy. The results of back analysis are in good agreement with laboratory tests and microscopy observations.

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Consolidation Study Of An Active Tailings Pond, B. F. Ulrich Jun 1993

Consolidation Study Of An Active Tailings Pond, B. F. Ulrich

International Conference on Case Histories in Geotechnical Engineering

Two geotechnical site investigations using state-of-the-art equipment for insitu testing have been made of a single tailing pond. The two separate investigations were made at an interval of approximately three years between studies. Each investigation included such tests as piezocone, self-boring pressuremeter, field vane shear, and standard penetration tests. The purpose of these tests was to establish various strength and phreatic characteristics of the tails in the deposit for use as input design parameters in the proposed upstream embankment expansion. This data may also be used to show a time-based consolidation study of a fully-drained, active tailing deposit. As tests …

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Earthquake Induced Landslides In Columbia, J. A. Rodriguez, C. J. Poran Jun 1993

Earthquake Induced Landslides In Columbia, J. A. Rodriguez, C. J. Poran

International Conference on Case Histories in Geotechnical Engineering

The paper presents a case study of landslides associated with the 1983 Popayan earthquake in Colombia. It includes a systematic parametric study of the effect of earthquake characteristics and soil properties on slope behavior. Earthquake induced slope displacements are computed based on the sliding block concept. Computed results from two and three-dimensional analyses are compared with field observations. Conclusions are drawn in regard to the adequacy of analysis procedures, validity of slope deformation-critical acceleration curves, and effect of vertical acceleration on slope stability.

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Earthquake Damage To Fill Dams, S. Tani Jun 1993

Earthquake Damage To Fill Dams, S. Tani

International Conference on Case Histories in Geotechnical Engineering

Earthquakes have caused much damage to fill type dams. Research into earthquake damage has contributed to the study of earthquake resistance of dams. However damage to fill dams occurred almost only to small scale earth dams, especially the few cases of heavy damage. This report describes the damage and performance of fill dams more than 15m-high during earthquakes, drawn from literature, data, and field surveys. The results indicate that even stronger earthquakes than the design earthquake intensity did not cause heavy damage to large well-constructed modern dams. The above analysis of the performance of fill dams during earthquakes shows that …

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Gravelly Soil Properties By Field And Laboratory Tests, Takaaki Konno, Yoshio Suzuki, Akira Tateishi, Kenji Ishihara, Kinji Akino, Setsuo Iizuka Jun 1993

Gravelly Soil Properties By Field And Laboratory Tests, Takaaki Konno, Yoshio Suzuki, Akira Tateishi, Kenji Ishihara, Kinji Akino, Setsuo Iizuka

International Conference on Case Histories in Geotechnical Engineering

The basic policy in Japan is to build nuclear reactor buildings on rock. But, in order to cope with the middle and long term siting problems it has become necessary to develop new siting technology from the standpoint of expanding the available range of site selections and effective utilization of lands. The gravelly soil layer in the Quaternary deposits has high possibility of becoming the bearing soil stratum when constructing a nuclear power plant. In order to verify the seismic stability of such gravelly soil layers, a series of field dynamic and static torsional loading tests for large scale in-situ …

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Liquefaction Study Eastern Scheldt Foreshore, T. P. Stoutjesdijk Jun 1993

Liquefaction Study Eastern Scheldt Foreshore, T. P. Stoutjesdijk

International Conference on Case Histories in Geotechnical Engineering

All available methods to obtain insight into the flow slide susceptibility have been applied on one location. This demonstrates, that the level of available knowledge is of influence on the quality of the advice. An overview of the methods and the results is given. The results are discussed. The conclusion is, that advanced study improves the understanding of uncertainties, and therefore gives a better assessment of risks. In this case, insight lead to the advice that no expensive measures were necessary, at least for part of the location.

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Numerical Estimate Of Tangshan Earthquake Damage, H. Y. Loo Jun 1993

Numerical Estimate Of Tangshan Earthquake Damage, H. Y. Loo

International Conference on Case Histories in Geotechnical Engineering

The initial stress is first calculated quasi-statically under various loading conditions by using 3-dimenaional finite element model with double nodes to simulate the locked Tangsban fault. Once the shear stress at the front of fault tip reaches rupture criterion, the accumulated stress is suddenly released accompanying with frictional slip along the fault plane, the new state of stress imposed during faulting is re-calculated by reducing the shearing resistance of the hypocenter with the same boundary condition. Then the stress difference before and during shock is regarded as the driving force to generate ground motion. Numerical results show that both the …

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Seismic Qualification Of Mechanical Systems, A. K. Singh, K. G. Bhatia Jun 1993

Seismic Qualification Of Mechanical Systems, A. K. Singh, K. G. Bhatia

International Conference on Case Histories in Geotechnical Engineering

Seismic qualification of large and complex mechanical systems is a tedious task in itself. It not only involves high computational cost, but also becomes cost ineffective in case repeated runs are required from safety considerations. Seismic analysis of one bank of Main PHT System of a typical Nuclear Power Plant has been attempted. Besides analysing the complete system, an attempt has also been made to divide the complete system into logical subsystems and analyse the same for the prescribed seismic loads. The results thus obtained have been compared with those of the complete system and a fairly good degree of …

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Comments Upon An Earth Dam Severely Damaged By Foundation Liquefaction, A. Popovici, A. Abdulamit, I. Toma, D. Pascu Jun 1993

Comments Upon An Earth Dam Severely Damaged By Foundation Liquefaction, A. Popovici, A. Abdulamit, I. Toma, D. Pascu

International Conference on Case Histories in Geotechnical Engineering

The damage of the Draganesti earth dam on lower sector of the Olt river due to foundation liquefaction during 30th May 1990, 0.12 g in site maximum acceleration, Vrancea earthquake is described. The dam is up to 20 m maximum height and border cross-wise and laterally the reservoir with 12.6 km length of the low head hydroelectric power station. The damage consisting of a large slide with about 60 m length at the dam downstream face and some cracks and lift-up of the reinforced concrete slabs at the corresponding upstream toe zone was placed in a zone where any special …

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Effects On High Plasticity Clay Deposits On Site Ground Amplification, John M. Ferritto Jun 1993

Effects On High Plasticity Clay Deposits On Site Ground Amplification, John M. Ferritto

International Conference on Case Histories in Geotechnical Engineering

This paper reviews the effects of the Lorna Prieta earthquake on Treasure Island and discusses previous studies of site ground motion amplification. An independent study was performed in which it is shown that the site amplification is attributable to the presence of the Bay Mud deposits, a high plasticity silty clay that exhibits higher than normal shear modulus with cyclic strain. There is a similarity with the Mexico City clay deposits in both high plasticity and site amplification. Engineers should be alert to high plasticity clay deposits as a potential source of ground motion amplification.

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Discussions And Replies Session 3, Ming-Hung Chen, R. C. Chaney, Wade E. Cooper, John Ferritto, A. Popovici, Shigeru Tani, M. K. Yegian, V. G. Ghahraman, T. P. Stoutjesdijk Jun 1993

Discussions And Replies Session 3, Ming-Hung Chen, R. C. Chaney, Wade E. Cooper, John Ferritto, A. Popovici, Shigeru Tani, M. K. Yegian, V. G. Ghahraman, T. P. Stoutjesdijk

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Rock Music Induced Damage And Vibration At Nya Ullevi Stadium, A. Bodare, S. Erlingsson Jun 1993

Rock Music Induced Damage And Vibration At Nya Ullevi Stadium, A. Bodare, S. Erlingsson

International Conference on Case Histories in Geotechnical Engineering

Two rock concerts were held in the City of Gothenburg, Sweden at Nya Ullevi soccer stadium the summer of 985. The stadium is founded on driven piles in soft clay. An enthusiastic audience was jumping in time to the songs. Violent vibrations of the suspension wires and in the cantilever roof beams of the structure were observed and damage to the roof and the building itself was detected after the concerts. People on the pitch and inside the stadium building experienced excessive vibrations. Residential buildings 400 m away experienced vibrations. Concerts are at present not permitted at the stadium. The …

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An Unsuccessful Urban Deep Excavation In Soft Soils, Richard Rodgers, Michael Majchrzak Jun 1993

An Unsuccessful Urban Deep Excavation In Soft Soils, Richard Rodgers, Michael Majchrzak

International Conference on Case Histories in Geotechnical Engineering

This case history presents, from a geotechnical engineer's viewpoint, various technical, budgetary, coordination, staffing and "hidden agenda" issues that contributed to poor performance of a shored deep excavation 10 soft soils. The anticipated and actual construction procedures are discussed and compared. In addition, approaches to stabilize significant movements of the shoring, and the methodology needed to justify a satisfactory future performance of a pile foundation system that was speculated to be damaged are discussed. By highlighting these issues, it is hoped geotechnical engineers will anticipate and better deal with the issues under their influence, understand issues over which they may …

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Analysis Of Fatal Accidents Caused By Trench Failure, Yasuo Toyosawa, Noriyuki Horii, Satoshi Tamate Jun 1993

Analysis Of Fatal Accidents Caused By Trench Failure, Yasuo Toyosawa, Noriyuki Horii, Satoshi Tamate

International Conference on Case Histories in Geotechnical Engineering

The purpose of this paper is to clarify the failure mechanism and how workers died due to trench failures with close examination of the situations surrounding these accidents. We carried out a statistical analysis of various factors obtained from fatal accident data which were reported by the Labour Standard Office to the Ministry of Labour. This examination revealed some important characteristics of fatal accidents due to trench failures.

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Augercast Pile Retaining Walls, D. W. Hohmeyer Jun 1993

Augercast Pile Retaining Walls, D. W. Hohmeyer

International Conference on Case Histories in Geotechnical Engineering

A case study is presented concerning the design and construction of two retaining walls constructed with augercast piles. The paper describes the successful use of augercast piles for retaining walls with heights of 22.0 and 32.0 feet. The 22.0 foot permanent wall was tied back to an existing structure. The temporary wall used a circular configuration and vertical anchor piles to obtain a 32.0 foot wall height without tiebacks or bracing.

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Behavior Of A Braced Sheet Pile Wall In Soft Clay, T. Edstam, Leif Jendeby Jun 1993

Behavior Of A Braced Sheet Pile Wall In Soft Clay, T. Edstam, Leif Jendeby

International Conference on Case Histories in Geotechnical Engineering

The earth pressure distribution against, and the displacement of, a braced sheet pile wall in soft clay have been examined. In connection with the construction of a fly-over, on the west cost of Sweden, two sections of a braced sheet pile wall were instrumented. The instrumentation consisted of earth pressure cells and inclinometer pipes mounted on three sheet piles. The sheet pile wall was also analyzed by means of the FLAC code in which the interaction between the sheet pile wall, the struts and the soil was studied. The movements and the calculations are compared with a conventional design method …

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Dewatering Of A Large Excavation Pit By Wellpoints, M. U. Ergun, M. S. Nalçakan Jun 1993

Dewatering Of A Large Excavation Pit By Wellpoints, M. U. Ergun, M. S. Nalçakan

International Conference on Case Histories in Geotechnical Engineering

An excavation, rectangular in dimensions of 55 m x 95 m at the base and approximately 120 m x 160 m at the ground surface was made possible by the use of multi-staged wellpoint dewatering system. Groundwater table was lowered more than 20 meters using four stage wellpoint system to construct the main wastewater pump station for the city of Izmir. The most significant soil parameter affecting the planning and design of the dewatering work is the coefficient of field permeability, and it has been directly measured by a large scale pumping test at the site. During dewatering and construction …

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Earth Pressures On Walls Of A Deep Excavation, Z. C. Moh, R. N. Hwang Jun 1993

Earth Pressures On Walls Of A Deep Excavation, Z. C. Moh, R. N. Hwang

International Conference on Case Histories in Geotechnical Engineering

This paper reports recorded earthpressures acting on diaphragm walls during a deep excavation carried out in a soft ground and discusses factors affecting the readings. The main theme of the paper is on wall friction and its influence on vertical earthpressures. It can be demonstrated that the assumption normally adopted in the design of the retaining structures for braced excavations that the vertical earthpressures equal to the overburden pressures could be erroneous. As a result, the vertical pressures on the active side are often over- estimated and those on the passive side under-estimated. In conclusion, it is appropriate for soft …

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Failure Of A Large Circular Excavation, R. E. Olson, R. E. Heuer Jun 1993

Failure Of A Large Circular Excavation, R. E. Olson, R. E. Heuer

International Conference on Case Histories in Geotechnical Engineering

A circular excavation, 117 feet (36 m) in diameter by 90 feet (27 m) deep, was designed by an experienced engineering firm and construction was performed by an experienced contractor. Nevertheless, the excavation support system suffered a complete collapse long before the maximum depth was reached. The failure is described and its causes are discussed.

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Failure Of Sewerage Mains Constructed In Soft Estuarine Deposit, M. M. Rahimi, C. Karwaj, P. K. Deb Jun 1993

Failure Of Sewerage Mains Constructed In Soft Estuarine Deposit, M. M. Rahimi, C. Karwaj, P. K. Deb

International Conference on Case Histories in Geotechnical Engineering

Rising and effluent mains of 600 mm and 750 mm diameter were constructed at two adjacent creek crossings in New South Wales, Australia. A bund wall was constructed across each creek and the mains were laid in a trench excavated through the bund wall into the underlying soft deposit. Foundation preparation consisted of pouring rockfill into the trench and compacting with a few strikes of the excavator bucket. After construction unacceptably large joint openings of up to 120 mm in width were measured. The authors were engaged to undertake a review of the geotechnical characteristics of the crossings and comment …

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Geotechnical Performance Of A Tunnel In Soft Ground, A. B. Parreira, R. F. Azevedo Jun 1993

Geotechnical Performance Of A Tunnel In Soft Ground, A. B. Parreira, R. F. Azevedo

International Conference on Case Histories in Geotechnical Engineering

The analysis of a tunnel section excavated through soft ground is presented. The tunnel construction was monitored and its behavior is compared with results obtained by a numerical simulation. The field instrumentation and the geotechnical properties of the site are presented and the modeling of the soil behavior using Lade's model discussed.

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Measurements And Predictions On The Elkhart Greek Culvert, P. M. Byrne, T. Srithar, C. B. Kern Jun 1993

Measurements And Predictions On The Elkhart Greek Culvert, P. M. Byrne, T. Srithar, C. B. Kern

International Conference on Case Histories in Geotechnical Engineering

This paper describes field measurements and analysis carried out on the Elkhart Creek soil arch culvert structure in British Columbia, Canada. The structure has a span of 13.4 m, a rise of 7.3 m, and a soil cover of 9.6 m. The original structure collapsed during backfilling in October 1987. A new structure of the same design was built in the Fall of 1989, and because of controversy regarding the design thrust value, it was instrumented to measure thrust, moment, and displacements in the arch. Displacements and stresses in the soil were also measured. The measured thrust values were much …

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Performance Of A Pier Consisting Of Three Sections, Edwin P. Woo, Cetin Soydemir, Thomas K. Liu Jun 1993

Performance Of A Pier Consisting Of Three Sections, Edwin P. Woo, Cetin Soydemir, Thomas K. Liu

International Conference on Case Histories in Geotechnical Engineering

A deteriorated 600 ft. long pier in Quincy, Massachusetts consisting of timber pile supported relieving platform and anchored steel sheet pile bulkhead sections was replaced with a new pier. The majority of the new pier consists of a deadman anchored steel sheet pile bulkhead. Due to the proximity of adjacent structures and another existing pier, two areas along the new pier could not accommodate an anchored bulkhead system. In these two areas, relieving platform and double steel sheet pile wall systems were constructed. Inclinometer data showing horizontal movements in the sheeting during the construction and post-construction periods are presented.

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Predictions Of The Behavior Of A Deep Braced Excavation, Jeen-Shang Lin, J. G. Deng Jun 1993

Predictions Of The Behavior Of A Deep Braced Excavation, Jeen-Shang Lin, J. G. Deng

International Conference on Case Histories in Geotechnical Engineering

This paper describes in detail a prediction about the responses of the soil and the RC diaphragm wall of a deep excavation in Taipei. The 21.8 m excavation was the deepest at the time, and it served as a good basis for testing previous back analysis results. As instrumentation records became available, updates were made and were passed to the contractor for the construction control purpose. The prediction was considered as a success.

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Reinforced Earth® Wall Supported By An Unstable Foundation, T. Schick, S. R. Neely, A. A. Joseph Jun 1993

Reinforced Earth® Wall Supported By An Unstable Foundation, T. Schick, S. R. Neely, A. A. Joseph

International Conference on Case Histories in Geotechnical Engineering

This paper updates a paper presented in 1987 at a meeting of the Texas section of the American Society of Civil Engineers. The 15-foot high, Reinforced Earth® Wall was constructed in 1981 to remediate slope instability at a site underlain by clay/concrete rubble fill to a depth of approximately 24 feet below the top of the wall. Additional data are presented on vertical and horizontal movements measured along the middle portion of the 350-foot long wall which has exhibited the most movements.

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Reinforced Soil Structure Test Sections In Mountainous Terrain, Pichit Jamnongpipatkul, Yongyuth Taesiri, Voranit Charumas Jun 1993

Reinforced Soil Structure Test Sections In Mountainous Terrain, Pichit Jamnongpipatkul, Yongyuth Taesiri, Voranit Charumas

International Conference on Case Histories in Geotechnical Engineering

Reinforced soil structure test sections have been constructed along the alignment of the highway route no 1149 leading to the top of a mountain in Chiang Rai Province, northern Thailand. The test sections are located on the steep slope of residual soil derived from diorite, divided into two subsections for a total length 9f about 300 m. Their heights vary up to twelve meters. The face slope is 70 degrees, initially protected with soil bags and finally with grasses and creepers. The reinforced element is high tensile strength polymer grid composing of "Tensar" SR 55, SR 80 and SR 110. …

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Studies On A 4.0m High Reinforced Earth Wall, Swami Saran, I. N. Khan Jun 1993

Studies On A 4.0m High Reinforced Earth Wall, Swami Saran, I. N. Khan

International Conference on Case Histories in Geotechnical Engineering

In this paper studies carried out on an instrumented 4. 0 m high reinforced earth wall have been described. The shape of potential failure surface was found bi-linear. Stability analysis based on computation using classical Renkine's theory was found applicable.

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Underpinning Of A Tilted Building, A Case History, Ch. Marangos Jun 1993

Underpinning Of A Tilted Building, A Case History, Ch. Marangos

International Conference on Case Histories in Geotechnical Engineering

In the paper, the case history of underpinning of a tilted four-storey building located near Kastoria lake, Greece, is presented. Based on geotechnical investigation results, the causes of tilting and the further behaviour of the building are investigated and the underpinning system is also presented.

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Measured Behavior Of A Deep Excavation In Weathered Rock, M. T. Mcrae, S. S. Kishnani, J. C. Burton Jun 1993

Measured Behavior Of A Deep Excavation In Weathered Rock, M. T. Mcrae, S. S. Kishnani, J. C. Burton

International Conference on Case Histories in Geotechnical Engineering

An instrumented deep excavation in weathered rock adjacent to a deflection-sensitive historical building is described. Two permanent shoring systems were used, presenting an opportunity to measure and compare their behaviors. Adjacent to the historic structure, a tied-back drilled pier wall was used, while the remainder of the excavation was supported by a tied-back shotcrete wall constructed in top-down fashion. Instrumentation included inclinometers, tiltmeters, and tieback load cells, supplemented by optical surveys. Both support systems performed well, with movements within acceptable ranges. The maximum horizontal deflection of the drilled piers was 0.33 inch (8 mm), one-third to one-fifth that of the …

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