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Geotechnical Engineering

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Articles 3421 - 3450 of 4582

Full-Text Articles in Engineering

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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Distress In Hirakud Dam, Orissa, India – Possible Causes And Remedial Measures, B. Ramachandran Jun 1993

Distress In Hirakud Dam, Orissa, India – Possible Causes And Remedial Measures, B. Ramachandran

International Conference on Case Histories in Geotechnical Engineering

Distress has been observed in the above dam, on its right spillway immediately after its completion in 1957. The distress has been intensified in the eighties with development of thin horizontal cracks in the undersluice barrels, gate gallery and adjoining areas at a level 18m above bed. These have all been chiselled, opened up and epoxy grouted; besides with water proof cement. But parallel cracks opened up soon after. Studies in detail carried out by various government organisations point out that rapid placement of concrete in ’55 - ‘56 leading to thermal stress is the main cause. Though some attribute …

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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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Landslide Management And Control In Himalayas, P. Jagannatha Rao Jun 1993

Landslide Management And Control In Himalayas, P. Jagannatha Rao

International Conference on Case Histories in Geotechnical Engineering

The Himalayan ranges experience intense mass movements, culminating in a large number of landsl1des every year. The road system in Himalayas is especially vulnerable to the landslide hazard. A number of techniques have been used in practice to manage and control landslides in these areas. The present paper deals with experiences gained in this regard. A few case histories are presented in the paper, wherein landslides have been successfully managed by appropriate techniques. These concern mainly (i) the use of hazard zonation techniques for solving chronic landslide problems by rationally identifying a stable alternate route and (ii) effective and economical …

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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 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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Pile Embankment On Soft Clay: Comparison Between Model And Field Performance, Bujang B. K. Huat, Faisal Hj. Ali Jun 1993

Pile Embankment On Soft Clay: Comparison Between Model And Field Performance, Bujang B. K. Huat, Faisal Hj. Ali

International Conference on Case Histories in Geotechnical Engineering

The paper describes the performance of a full scale pile embankment on soft clay foundation which has been built and instrumented in Malaysia. Reference is made to a parallel design study carried out using centrifuge modelling technique.

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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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Smw Wall For Seepage Control In Levee Reconstruction, D. S. Yang, U. Luscher, I. Kimoto, S. Takeshima Jun 1993

Smw Wall For Seepage Control In Levee Reconstruction, D. S. Yang, U. Luscher, I. Kimoto, S. Takeshima

International Conference on Case Histories in Geotechnical Engineering

An SMW wall was installed as a cutoff wall for seepage control during high floods in a narrow levee constructed in the early 1900's using sandy soils. After part of the wall was installed, difficulties were encountered in evaluating the permeability of the as-built cutoff wall according to the project specifications. Methods used to evaluate the permeability of the cutoff wall included laboratory tests on bulk samples and core samples and in-situ permeability tests. Significant differences in test results were caused by various sample preparation and handling procedures, sampling disturbance, and different testing methods. The difficulties were resolved by performing …

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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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The Agua Prieta Powerhouse Slope Instability, F. Gonzalez-Valencia, S. Herrera-Castañeda Jun 1993

The Agua Prieta Powerhouse Slope Instability, F. Gonzalez-Valencia, S. Herrera-Castañeda

International Conference on Case Histories in Geotechnical Engineering

The slope instability that endangered seriously the powerhouse of the Aqua Prieta Hydroelectric Project and involved about one million cubic meters of soils and breccias is described. The evolution of the geotechnical instrumentation measurements done from October 1987 to date, the geomechanic analysis performed and the stabilization works are discussed.

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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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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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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 Response Of 30-Story Building During The Loma Prieta Earthquake, T. Kagawa, M. A. Al-Khatib Jun 1993

Earthquake Response Of 30-Story Building During The Loma Prieta Earthquake, T. Kagawa, M. A. Al-Khatib

International Conference on Case Histories in Geotechnical Engineering

A 30 story building supported by 828 piles had been subjected to the Loma Prieta earthquake in 1989. The building was heavily instrumented by strong-motion devices. This study analyzed and compared computed and recorded responses of the building by using the state-of-the-art techniques for dynamic pile-group interaction. Computed results were in good agreement with recorded ones.

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Earthquake-Induced Parameter Automation, Gregory L. Hempen, James L. Keim, James L. Mayo Jun 1993

Earthquake-Induced Parameter Automation, Gregory L. Hempen, James L. Keim, James L. Mayo

International Conference on Case Histories in Geotechnical Engineering

An operating automated system has been developed for Wappapello Dam. The system allows periodic reading of foundation pore pressure sensors. Upon sensing strong ground shaking the system reads rock and foundation triaxial acceleration. The acceleration readings cause the system to collect pore pressure rise in a loose, saturated sand. The data is available over telephone lines in real time. In addition to reducing maintenance piezometer reading labor, the automation performs earthquake triggering notification and remote data evaluation. The engineering use for dam safety review is considered invaluable.

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Ground Waving And Its Damaging Effect, John G. Z. Q. Wang Jun 1993

Ground Waving And Its Damaging Effect, John G. Z. Q. Wang

International Conference on Case Histories in Geotechnical Engineering

Some unusual patterns of earthquake damages due to ground waving have been described in order to draw attention to further research towards these problems. A brief introduction of relevant theoretical approach to torsional components of ground motion and amplification of seismic surface waves due to local topographic irregularities have been given in this paper to provide a contrast between theoretical approach and practical cases in order to reflect the gap to be filled.

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Liquefaction Case Histories From 1990 Manjil, Iran, Earthquake, M. K. Yegian, M. A. A. Nogole-Sadat, V. G. Ghahraman, H. Darai Jun 1993

Liquefaction Case Histories From 1990 Manjil, Iran, Earthquake, M. K. Yegian, M. A. A. Nogole-Sadat, V. G. Ghahraman, H. Darai

International Conference on Case Histories in Geotechnical Engineering

The Manjil, Iran, earthquake caused extensive liquefaction and liquefaction-induced damage to residential, commercial and public structures. This paper presents liquefaction case histories as well as the results from our analysis of the data. Based on the field observations made in Iran, liquefaction strength of clean sands for Ms=7.7 is established. The resulting liquefaction resistance versus density relationship is compared with the results published by Seed et al. (1983).

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Macrozonation Of Landslides For The Manjil, Iran 1990 Earthquake, M. Zaré Jun 1993

Macrozonation Of Landslides For The Manjil, Iran 1990 Earthquake, M. Zaré

International Conference on Case Histories in Geotechnical Engineering

The macrozonation and classification studies are carried out for the induced landslides in the imprinted area of the Manjil, Iran earthquake of 20 June 1990, in view point of engineering geology. The earthquake induced landslides are classified in 7 classes and all of them are mapped on the seismotectonic map of the region. Landslides of the historic time are considered as well. These studies showed that the most of large earthquake induced landslides are occurred within the earthquake origin zone of this earthquake and in the area which is specified with the earthquake intensity of more than VII (7) MSK. …

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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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Correlation Of Foundation Vibration Results, R. A. Slabbaert, J. P. Lee, J. A. Bohinsky Jun 1993

Correlation Of Foundation Vibration Results, R. A. Slabbaert, J. P. Lee, J. A. Bohinsky

International Conference on Case Histories in Geotechnical Engineering

The vibration a paper machine generates during normal operation presents a complicated challenge to engineers of paper machine support structures. The modeling and the analysis procedure inevitably involves many simplifications and assumptions. Therefore, a comparison of the calculated and the measured results is very helpful in assessing the validity of the overall approach. This paper discusses correlation of calculated paper machine vibration with actual field measurements for a specific paper machine installation. A force-response analysis was performed using a commonly accepted industry practice which is generally considered to be conservative in several areas. Subsequently, field vibration measurements were made. The …

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Discussions And Replies Session 4, M. R. Svinkin, G. M. S. Manyando, M. R. Lewis, J. R. Davie, X. J. Yang, G. Y. Gao Jun 1993

Discussions And Replies Session 4, M. R. Svinkin, G. M. S. Manyando, M. R. Lewis, J. R. Davie, X. J. Yang, G. Y. Gao

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Measurements Of Seismic Road Vibrations, L. T. Long Jun 1993

Measurements Of Seismic Road Vibrations, L. T. Long

International Conference on Case Histories in Geotechnical Engineering

Vibrations from vehicles on adjacent roads can impact sensitive instruments or structures with historic significance. The amplitudes of vibrations (A) from steady traffic in Atlanta, Georgia, were found to decay with distance (r) according to the relation Log[A(mm/s) ]=0.9-1.25Log(r(m)]. Intervening topographic relief reduces the level of vibration. Using this relation, the impact of a proposed highway was estimated to cause an 8 percent degradation in photographic images with telescope. A topographic barrier could reduce, but would not eliminate the impact of highway vibration. In a second application, a freeway access ramp was originally planned close enough for the vibrations from …

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