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Articles 177391 - 177420 of 197991

Full-Text Articles in Engineering

Inconvenient Foundation System In Problematic Soil, M. M. Reyad Jun 1993

Inconvenient Foundation System In Problematic Soil, M. M. Reyad

International Conference on Case Histories in Geotechnical Engineering

This paper presents a study of a case of severe distress happened in an administration building constructed in new desert area. Some Egyptian deserts have uncommon soil formation which is still not well known for many engineers. Due to insufficient investigations, the soil behaviour was not adequately recognized specially when it comes in contact with water. The result was inconvenient foundation system. Severe cracks and unexpected damage had happened in many parts in the building after use. The paper comprises all the carried out investigations and studies to identify the problem in order to prevent any more deterioration and adopt …

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Prediction And Observation Of Pore Pressure Due To Pile Driving, S. Chandra, Md. I. Hossain Jun 1993

Prediction And Observation Of Pore Pressure Due To Pile Driving, S. Chandra, Md. I. Hossain

International Conference on Case Histories in Geotechnical Engineering

In this study, pore pressure response due to pile driving has been observed in the field. Cavity Expansion theory using critical state parameters of the soil has been used to predict the trend of the pore pressure development and dissipation. Parametric study has been carried out to know the sensitivity of various parameters on the predicted results. A comparison has been made between the predicted and observed results.

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Remedial Measures To A Building Settlement Problem, A. Sridharan, B. R. Srinivasa Murthy Jun 1993

Remedial Measures To A Building Settlement Problem, A. Sridharan, B. R. Srinivasa Murthy

International Conference on Case Histories in Geotechnical Engineering

A ten storeyed building, built on a subsoil of an onshore marine soil, was observed to be tilting away from the vertical. Extensive field and laboratory investigations were carried out to establish the reasons for the differential settlement causing the tilting. Though, nearly uniform pressure has been achieved at the foundation level, presence of a soft marine clay layer with varied thickness and location has caused the differential settlement. To arrest further increase in differential settlement, micropiling in the zone of higher settlement and additional loading and lowering of water table in the zone of lower settlement have been carried …

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Safety Evaluation Of Overhead Line Towers, M. P. Luong Jun 1993

Safety Evaluation Of Overhead Line Towers, M. P. Luong

International Conference on Case Histories in Geotechnical Engineering

A nondestructive vibratory testing using impulsive tension slacking has been devised for the quality and safety control of overhead line towers of Electricité de France. Several structural control experiments have been conducted on four-legged towers resting on three types of foundations: concrete stepped or pedestal blocks, steel piles and prestressed foundations. Experimental results have given significant vibratory signatures in close connection with the geotechnical response characteristics of both slender structures and their foundations. This paper presents some significant results of the test program of safety evaluation of the pylon.

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Settlement Of Multi-Story Buildings On Sand Fills, K. J. Osinubi Jun 1993

Settlement Of Multi-Story Buildings On Sand Fills, K. J. Osinubi

International Conference on Case Histories in Geotechnical Engineering

The behaviour of two residential buildings with shallow foundations supported on sand fills with underlying soft alluvial deposits are discussed. Regular settlement measurements were taken for four and seven years on the foundations of the nine-storey and five-storey buildings respectively. Measured settlements have been compared with predictions based on the theory of one-dimensional consolidation. The factors that might have been responsible for the lower predicted settlement values are highlighted.

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Soil-Structure Interaction And Aseismic Design Of A Stadium Building, V. D. Miglani Jun 1993

Soil-Structure Interaction And Aseismic Design Of A Stadium Building, V. D. Miglani

International Conference on Case Histories in Geotechnical Engineering

The paper presents case history of a reinforced concrete stadium building which had been structurally designed for a particular component configuration and also constructed upto seating level and which was referred to the author for suggesting structural modifications and redesigning for different configuration which meant curtailing middle two main columns each above the seating level out of four columns in each of left and right halves of the building. The required modifications necessitated analysis of the modified frame under static loads taking into account soil-structure interaction. The other problem to be tackled was ensuring lateral stability with reduced number of …

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Stability Of A Mast Foundation: A Case Study, Yudhbir, P. K. Basudhar Jun 1993

Stability Of A Mast Foundation: A Case Study, Yudhbir, P. K. Basudhar

International Conference on Case Histories in Geotechnical Engineering

The paper describes details of analysis for stability and deformation of mast foundations during installation operations for a chemical reactor in alluvial deposits. Brief details of the loads involved, foundation type, installation procedure, and evaluation of geotechnical design parameters have also been presented. The successful installation of the reactor seems to support the predicted response of the foundation.

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The Forest City Landslide, R. E. Hunt, S. M. Miller, V. L. Bump Jun 1993

The Forest City Landslide, R. E. Hunt, S. M. Miller, V. L. Bump

International Conference on Case Histories in Geotechnical Engineering

A large and complex landslide in marine shales is impacting the approach roadway and a 4600-ft long bridge carrying U.S. Route 212 over the Oahe Reservoir at Forest City, South Dakota. After extensive investigation and analyses it was determined that the main landslide could be remediated by unloading the slide using a large cut through the escarpment located upslope from the bridge. Although moving with the main slide, the 900- foot long approach embankment is failing in directions differing from the main slide. Preliminary study indicates that the independent slides within the approach embankment can be stabilized by stone columns …

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Uplift Capacity Of Driven Piles From Static Loading Tests, M. H. Hussein, J. M. Sheahan Jun 1993

Uplift Capacity Of Driven Piles From Static Loading Tests, M. H. Hussein, J. M. Sheahan

International Conference on Case Histories in Geotechnical Engineering

A pile driving and testing program was undertaken to evaluate installation procedures, assess capacity (particularly in uplift) of 24- and 30-inch square, prestressed concrete piles, and provide foundation design parameters for the New Edison Bridge project in Fort Myers, Florida. The subsurface profile generally consisted of three major soil strata: an upper clayey sand and sandy clay layer to a depth of about 45 to 50 feet below mudline, a medium dense to dense silty sand middle layer about 10 feet thick, and a third layer of dense to very dense silty fine sand. Eleven prestressed concrete test piles of …

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Foundations Of New York Naval Base Sima Building, C. C. Chang, R. L. Kanthan Jun 1993

Foundations Of New York Naval Base Sima Building, C. C. Chang, R. L. Kanthan

International Conference on Case Histories in Geotechnical Engineering

This paper illustrates an exhaustive geotechnical effort to accompany the design and construction of the foundations of the SIMA Building of the United States Naval Shore Support Facility on Staten Island, New York.

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Ground Failure And Remedial Measures At A Block Of Flats, I. Stanculescu, A. Chirica Jun 1993

Ground Failure And Remedial Measures At A Block Of Flats, I. Stanculescu, A. Chirica

International Conference on Case Histories in Geotechnical Engineering

Thee ground failure presented in the paper, occurred in 1986, in the foundation ground, of a ten storyed block of flats, consisting of Bahlui structured dilatant clay, normally consolidated. The foundation ground rupture, by plastic yielding, begin shortly after an accidental drowning of the basement. Before this accident, the building had not presented any signs of evolutive settlements processes. The paper presents the consolidation measures taken to stop the progressive yielding of the ground beneath the foundations. Results of tests pointed out the dilatant behavior and the sensitivity to moistening of the Bahlui clays, during the shear process.

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Analyses Of Behaviors Of Embankment Dams, N. Yasuda, M. Itoh, T. Fujisawa Jun 1993

Analyses Of Behaviors Of Embankment Dams, N. Yasuda, M. Itoh, T. Fujisawa

International Conference on Case Histories in Geotechnical Engineering

The design of embankment is carried out based on several assumptions for the dam body and foundation, and the dam is constructed according to the design conditions. Therefore, it is important to evaluate the conforming of assumptions to the design and construction by the observation of behavior of the dam body and foundation. In this report, internal vertical movement, pore-water pressure and surface movement are arranged concerning of 21 embankment dams of Japan in order to optimize the measurement method including frequency and proper installation of instrumentation and consequently to present a guidelines for the safety control of dams.

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Behavior Of A Breakwater On Soft Sediments – Failure And Success, S-C. R. Lo, S-Q Li Jun 1993

Behavior Of A Breakwater On Soft Sediments – Failure And Success, S-C. R. Lo, S-Q Li

International Conference on Case Histories in Geotechnical Engineering

The observed responses during the staged construction of an unreinforced section and a reinforced section of a breakwater founded on soft sediments are presented. Both sections were instrumented and the unreinforced section approached instability at the end of Stage I construction. A series of Class 'C' predictions were made with three different analytical methods. It was particularly difficult to predict the impending instability of the unreinforced section. A fully coupled finite element analysis, with close modelling of the construction sequence and using a strain softening model for the foundation clay, was needed to predict all the observations.

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General Report Session No. 2: Case Histories Of Slopes, Dams And Embankments, Leslie F. Harder Jr., Vlad G. Perlea, Nario Yasuda Jun 1993

General Report Session No. 2: Case Histories Of Slopes, Dams And Embankments, Leslie F. Harder Jr., Vlad G. Perlea, Nario Yasuda

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Case History – Monitored Settlement Of 32m Thick Compacted Fill, William A. Trow, Richard Carrington, Timothy G. Orpwood Jun 1993

Case History – Monitored Settlement Of 32m Thick Compacted Fill, William A. Trow, Richard Carrington, Timothy G. Orpwood

International Conference on Case Histories in Geotechnical Engineering

An abandoned brickyard, about 32 m deep, was filled with soil from numerous excavations in the Metro Toronto area with the ultimate intent of development for residential purposes. Compaction and environmental control of the fill was carried out and drainage wells installed to keep the water table low in order to hasten the rate of settlement. The fill generally was placed at approximately 85 percent saturation. A magnetic settlement system was installed as the fill was placed and the differential settlement recorded during fill placement and about 4 years after completion. The rate of settlement response was rapid but proceeded …

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Chinese Expansive Soil Canal Project, Ke Zunjing, Fan Qiuyan, Wang Guanping, Wang Xiangfan Jun 1993

Chinese Expansive Soil Canal Project, Ke Zunjing, Fan Qiuyan, Wang Guanping, Wang Xiangfan

International Conference on Case Histories in Geotechnical Engineering

This paper gives three representative expansive soil canal projects in China. The engineering geological conditions, the properties of the expansive soil, features of the slides and the measures taken for these canal projects are introduced in detail.

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Development Of Landslide At Csa-Open Mine In Bohemia, P. P. Procházka, J. Vacek Jun 1993

Development Of Landslide At Csa-Open Mine In Bohemia, P. P. Procházka, J. Vacek

International Conference on Case Histories in Geotechnical Engineering

Because of its descriptive properties physical modelling belongs to one of the most prospective means for assessment of behaviour of soils and rocks. Its disadvantage is a poor description of stress fields in the material. This difficulty can be partly avoided by means of mathematical modelling mainly by comparison of both the models. The coupled modelling brings also about new views on the statements of constitutive relations, here following Drucker, Prager, 1952, also Brož, Procházka, 1987, mathematical background e.g. Duvant, Lions, 1972. For more details of physical modelling see e.g. Vacek, 1991, another application of coupled modelling see e.g. Vacek, …

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Dynamics Of Rockfalls In Sri Lanka And Landslide Hazards, R. K. Bhandari, K. Jeyatharan, A. Raviskanthan Jun 1993

Dynamics Of Rockfalls In Sri Lanka And Landslide Hazards, R. K. Bhandari, K. Jeyatharan, A. Raviskanthan

International Conference on Case Histories in Geotechnical Engineering

The paper spotlights the dynamics of rockfalls and debrisflows in Sri Lanka in the backdrop of some recent examples and discusses the appropriateness of simple energy dissipation systems in situations where source of rockfall is either intractable or difficult to arrest. The question of runout of rockfalls usually significant in the assessment of their damage potential is also discussed and importance of such estimate is highlighted in the context of landslide hazard zonation mapping.

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Evaluation And Remediation Of A Small Landslide In Colluvium, D. T. Mooney, J. J. Bowdes Jr. Jun 1993

Evaluation And Remediation Of A Small Landslide In Colluvium, D. T. Mooney, J. J. Bowdes Jr.

International Conference on Case Histories in Geotechnical Engineering

A landslide in colluvium near Grafton, West Virginia was evaluated for cause and remediation. Monitoring was conducted for 15 months to observe further movements prior to remediation. The observed failure surface, slide geometry and groundwater conditions were used to back-solution for an effective residual friction angle ( φr’) . The φr’ was found to agree well with index property correlations cited in the literature. Slope failure resulted from excessive pore water pressures due to seasonably high groundwater levels. Stability analyses using the back-solutioned φr’ were performed to design and position seepage cutoff drains for …

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Full Scale Field Test On A Slope Progressive Failure, I. Stanculescu, C. Athanasiu, A. Chirică, I. I. Stănculescu, E. Georgescu Jun 1993

Full Scale Field Test On A Slope Progressive Failure, I. Stanculescu, C. Athanasiu, A. Chirică, I. I. Stănculescu, E. Georgescu

International Conference on Case Histories in Geotechnical Engineering

In order to obtain the mechanical behaviour parameters of the red structured clays from the Danube- Black Sea Canal and to estimate the behavior of the slopes cut in such clays, an experimental programme was carried out. A checked failure was provoked for a slope dug in red fissured clays. The paper presents the results of the field investigations and the laboratory test regarding the, characteristics of the structured clays, as well as the in situ measurements during the experimental programme. The results of these measurements are compared with those obtained by numerical symulation using a computer program.

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Geotechnical Prediction And Performance Of Eastern Scheldt Storm Surge Barrier, J. Lindenberg, A. Plooster, J. P. F. M. Janssen Jun 1993

Geotechnical Prediction And Performance Of Eastern Scheldt Storm Surge Barrier, J. Lindenberg, A. Plooster, J. P. F. M. Janssen

International Conference on Case Histories in Geotechnical Engineering

The construction of the Eastern Scheldt storm surge barrier was completed in 1986. The monitoring system meant to verify the functioning of the barrier during storm conditions became operational in 1988. Data concerning the geotechnical response was collected during the 4 days storm period between February 26 and March 2, 1990. In the paper some results are described. Conclusions with respect to the expected behaviour of the barrier during more extreme storms in future will be drawn in near future.

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Large Scale Instrumental Test Embankment On Uranium Tailings, J. L. Santiago, T. Barrera, M. Pastor Jun 1993

Large Scale Instrumental Test Embankment On Uranium Tailings, J. L. Santiago, T. Barrera, M. Pastor

International Conference on Case Histories in Geotechnical Engineering

The remediation of an inactive uranium mill tailings pile at the town of Andujar (Spain) has provided an opportunity to investigate the settlement characteristics of hydraulically-deposited uranium mill tailings. A test embankment was constructed on top of the existing tailings deposit and total stresses, settlements and pore pressures were measured. Settlements and pore pressure data were compared with the results obtained using an elastoplastic numerical model which allows the simulation of two dimensional consolidation processes. Backcalculated consolidation parameters were derived to provide agreement between the calculated and measured settlements and pore pressures. These parameters could then be used to predict …

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Nipigon River Landslide, R. B. Dodds, J. P. Burak, K. D. Eigenbrod Jun 1993

Nipigon River Landslide, R. B. Dodds, J. P. Burak, K. D. Eigenbrod

International Conference on Case Histories in Geotechnical Engineering

A massive landslide occurred on the Nipigon River, north of the Town of Nipigon, Ontario, Canada in the early morning hours of April 23, 1990 and involved an estimated 300,000 cu m of soil. Although there was no loss of life, there were significant environmental and economic impacts. Discussed in this paper are the investigations carried out after the slide, the events prior to and the factors contributing to, the slide.

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Overview Of Geotechnical Issues Involved In The Olmsted Locks And Dam Project, J. C. Ruhl Jun 1993

Overview Of Geotechnical Issues Involved In The Olmsted Locks And Dam Project, J. C. Ruhl

International Conference on Case Histories in Geotechnical Engineering

The Olmsted Locks and Dam project consists of new twin 1200-foot locks and dam located on the Ohio River near its confluence with the Mississippi River. The site of the locks and dam presents some unique geotechnical challenges. A major landslide on the Illinois bank, artesian groundwater conditions, significant seismic considerations, and the design of the pile foundation and the construction cofferdams presented major challenges to the design engineers. The geotechnical investigations and the design considerations involved in this project are discussed.

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Performance Of A Low Embankment On A Soft Soil Deposit, Gerald P. Raymond Jun 1993

Performance Of A Low Embankment On A Soft Soil Deposit, Gerald P. Raymond

International Conference on Case Histories in Geotechnical Engineering

The design and performance of a surcharged highway embankment across a 45 metre thick soft soil deposit is described. Using theoretical soil mechanics concepts it was predicted that the long-term stability necessitated the use of berms despite the fact that an undrained strength analysis based on in situ vane tests predicted a reasonable factor of safety. This fact is supported by the performance of an existing road. Consideration of both theoretical soil mechanics concepts and practical considerations suggested that the berms should be construction prior to the central fill and from their outer limits towards the centre. The central fill …

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Performance Of An Embankment Built On A Soft Disturbed Clay, M. S. S. Almeida, F. A. B. Danziger, M. C. F. Almeida, S. R. L. Carvalho, I. M. S. Martins Jun 1993

Performance Of An Embankment Built On A Soft Disturbed Clay, M. S. S. Almeida, F. A. B. Danziger, M. C. F. Almeida, S. R. L. Carvalho, I. M. S. Martins

International Conference on Case Histories in Geotechnical Engineering

A high embankment was built on a soft clay disturbed due to an inadequate technique. Settlement analysis has been carried out to estimate coefficients of consolidation Cv, final settlements and average degrees of consolidation U. Laboratory and in situ tests have been performed to estimate C values as well. Piezometric measurements have also been made to estimate U values corrected with non linear oedometer test data. Times for settlement stabilization have been estimated with the available data.

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Rock Slides Along Haibat Sultan Road, N. Iraq, S. N. Al-Saadi, S. H. Al-Jassar Jun 1993

Rock Slides Along Haibat Sultan Road, N. Iraq, S. N. Al-Saadi, S. H. Al-Jassar

International Conference on Case Histories in Geotechnical Engineering

The instability of rock slopes controlling the main Arbil-Sulaimaniya road has been studied in the southwestern side of Haibat Sultan Mountain, northern Iraq. The cause of this instability is the presence of road cuts as well as the erosion at the toe of the slope. The military operations in the area have further increased the hazardous condition of the slope. Field observations at ten stations have revealed that plane sliding of limestone slabs had occurred within the layers of friable marl. The study focused on the mode of failure, as affected by slope orientation and discontinuity geometry. Subsequent monitoring revealed …

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Slope Engineering Of Expansive Highway Cut, Ge Guangbin, Ke Zunjing Jun 1993

Slope Engineering Of Expansive Highway Cut, Ge Guangbin, Ke Zunjing

International Conference on Case Histories in Geotechnical Engineering

This paper introduces the engineering geological conditions, the properties of the expansive soil and the measures taken in detail for two slope engineering projects of expansive highway cut In Guangxi province of China.

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Tailing Dam Zelazny Most Environmental Hazard, M. Werno, B. Dembski, B. Juszkiewicz-Bednarczyk, Z. Mlynarek, W. Tschuschke Jun 1993

Tailing Dam Zelazny Most Environmental Hazard, M. Werno, B. Dembski, B. Juszkiewicz-Bednarczyk, Z. Mlynarek, W. Tschuschke

International Conference on Case Histories in Geotechnical Engineering

The factors governing the geotechnical stability of copper tailing dam Żelazny Most, the largest in Europe, have been discussed. The efficiency of pumping wells barrier against outflow of contaminated ground water has been predicted for a period of next 15 years.

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Time Prognosis Of Landslide Based On Unstable Creep, Wang Jianguo Jun 1993

Time Prognosis Of Landslide Based On Unstable Creep, Wang Jianguo

International Conference on Case Histories in Geotechnical Engineering

The fundamental characters at each of three stages of creep deformation of rock masses are discussed. A model, a friction element and a dashpot element connected in parallel, suitable for middle and short time prognosis is suggested--landslide happens at accelerated creep stage and its mechanism may be described by progressive deterioration (assuming linear decrease with time) of material parameters which denote the friction and the dashpot of rock masses. The verification for the model is carried out by comparing theoretical results with measured results of three typical landslides.

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