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Articles 15541 - 15570 of 21740

Full-Text Articles in Engineering

Friction Pile Foundations Subject To Regional Subsidence, A. Rico, J. M. Orozco, J. L. León Jun 1993

Friction Pile Foundations Subject To Regional Subsidence, A. Rico, J. M. Orozco, J. L. León

International Conference on Case Histories in Geotechnical Engineering

A load mechanism and its associated displacements for friction piles driven in a soil subject to regional subsidence is presented. The effect of a surficial crust, which is not under consolidation, is analyzed and to avoid pile emersion, a boundary for the piles safety factor is established. Foundations supported on friction piles, where the foundation slab should always be in contact with the supporting soil, is also analyzed. It is proposed to consider that the load transmitted by the foundation slab be equal to the excavated weight and it is suggested that the increase pile-soil adherence with time, should be …

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Geocomposites For Foundation Uplift Pressure Control In Impermeable Soils, J. C. Chang, J. Y. Wu Jun 1993

Geocomposites For Foundation Uplift Pressure Control In Impermeable Soils, J. C. Chang, J. Y. Wu

International Conference on Case Histories in Geotechnical Engineering

Mat foundations constructed in impermeable soils with a high groundwater table will experience a substantially high buoyancy force due to hydrostatic pressure. Conventional solutions to this problem are to increase the structural weight or install piles or anchors to counterbalance the uplift. These methods are costly, inefficient, and time-consuming. This paper presents a case study to show an innovated approach by using geocomposites to cope with the uplift in impermeable soils. Uplift pressure relief system consisted of geosynthetic materials was installed for a 14- story office and apartment building. The raft foundation was built at 50 feet below ground surface. …

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Ground Movements And Pore Pressure Variation Caused By Epb Shield Tunneling - Shanghai (China) Sewage Tunnel, K. M. Lee, X. Yi, R. K. Rowe Jun 1993

Ground Movements And Pore Pressure Variation Caused By Epb Shield Tunneling - Shanghai (China) Sewage Tunnel, K. M. Lee, X. Yi, R. K. Rowe

International Conference on Case Histories in Geotechnical Engineering

The observed pore pressures and deformations induced by an earth balance shield used to construct the Furongjiang sewer tunnel in soft saturated ground in Shanghai, China, are briefly described. Continuous records of immediate surface settlements and ground movements were obtained as the tunnel face approaching and moving away from the observation points. A correlation between resulting heave/settlements and driving force is observed. A finite element technique for predicting these pore pressures and deformations is developed. A comparison is then made between numerical results and the results of field measurements and it is shown that there is encouraging agreement between the …

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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 Of Drilled Shafts Axial Capacities Using Cpt Results, O. M. Alsamman, J. H. Long Jun 1993

Prediction Of Drilled Shafts Axial Capacities Using Cpt Results, O. M. Alsamman, J. H. Long

International Conference on Case Histories in Geotechnical Engineering

Results from nineteen full-scale axial load tests are reviewed to compare methods for predicting axial capacities of drilled shafts using results of Cone Penetration Tests (CPT). The three methods to estimate failure loads are: (1) Nottingham method, (2) Laboratoire des Ponts et Chaussees method (LPC), and (3) the Poulos and Davis method. Comparisons are made to assess the accuracy and dependability of each predictive method. Analyses of results indicate that the LPC method provides the most reliable predictions for axial capacities of drilled shafts in clay.

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Reanalysis Of A Vacuum Distillation Unit Foundation, M. N. Viladkar, Swami Saran Jun 1993

Reanalysis Of A Vacuum Distillation Unit Foundation, M. N. Viladkar, Swami Saran

International Conference on Case Histories in Geotechnical Engineering

This paper deals with the reanalysis of the foundation of an already existing Vaccum Distillation Unit in an oil refinery. The reanalysis is required to suggest if the existing foundation of the unit would be capable enough to withstand an additional pressure intensity to which it would be subjected due to proposed expansion of the unit. The paper therefore discusses the geotechnical investigation program undertaken for evaluating the relevant design parameters and the methodology adopted to compute the sustainable pressure of the foundation.

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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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Researches In The Testing Method Of Dynamic Interaction Of Pile-Soil System Model And Its Calculation Of Dynamic Characteristics, Zu Ming Jiang, Wei Feng Zhao Jun 1993

Researches In The Testing Method Of Dynamic Interaction Of Pile-Soil System Model And Its Calculation Of Dynamic Characteristics, Zu Ming Jiang, Wei Feng Zhao

International Conference on Case Histories in Geotechnical Engineering

This paper provides the theoretical base and a reasonable testing method for pile foundation, the top of piles are free and the bottom of piles are fixed, dynamic characteristics test of continuous beam bridge, considering the dynamic interaction of pile-soil for doing pile foundation dynamic test in site. The model analysis method and CAT( Computer Aided Test ) are used for model parameters identification from the dynamic of pile foundation mode, several low cured modes and natural frequencies are got. Furthermore, the theoretical computation compared with result of the mode test. Both are most alike. The dynamic characteristics of the …

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Successful Design Of Expansive-Soil Foundation For A Large Modern Chemical Fertilizer Plant, H. B. Qian Jun 1993

Successful Design Of Expansive-Soil Foundation For A Large Modern Chemical Fertilizer Plant, H. B. Qian

International Conference on Case Histories in Geotechnical Engineering

Various methods of foundation treatment had been adopted in the design of different parts of the plant according to its particular needs respectively. The adopted methods include: selecting rational depth of foundation; increasing pressure on the base of foundation; replacement of soils; sand mat; pier foundation and large diameter cast-in-place piles. In addition to the foundation treatments, measures were also taken to prevent the infiltration of water and to protect the moisture of sub-soils. The super-structure were also designed to have a greater rigidity.

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Testing Of Drilled Shafts Socketed Into Limestone, G. L. Panozzo, F. H. Kulhawy, F. C. Bauhof, A. J. O'Brien Jun 1993

Testing Of Drilled Shafts Socketed Into Limestone, G. L. Panozzo, F. H. Kulhawy, F. C. Bauhof, A. J. O'Brien

International Conference on Case Histories in Geotechnical Engineering

Construction of the first phase of the South Parking Garage at the Tampa International Airport in Florida was completed in December 1991. A full-scale field load testing program was used in design of the drilled shaft foundations, with specific goals of determining the bond strength and characterizing the load-displacement behavior of the rock sockets. The displacement behavior and bond strength of the test shafts were predicted from elastic solutions and semiempirical methods. Input parameters included the rock uniaxial compressive strength and elastic modulus. The load test results are compared to the predictions herein, and the practical application of these comparisons …

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The Analysis Of Local Subsoil Failure, Igor Soric, Željko Sokolić, Darko Zvornik Jun 1993

The Analysis Of Local Subsoil Failure, Igor Soric, Željko Sokolić, Darko Zvornik

International Conference on Case Histories in Geotechnical Engineering

The paper deals with a case history of a local foundation failure caused by removing the neighbouring building. Displacement measurements after removing the neighbouring all the working stages at the site. The shape of the deformation curve points to failure after removing the neighbouring old building. The foundation soil is a Moscow sand typical for the large part of the urban Moscow area. It is a poorly graded fine sand of a medium density. Using back analysis for all working stages the peak and residual parameters caused by foundation failure were defined. The ratio of residual to peak value of …

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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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Tribeca Tower Foundation System, Jacek K. Leznicki, Robert G. Gaibrois, Melvin L. Esrig Jun 1993

Tribeca Tower Foundation System, Jacek K. Leznicki, Robert G. Gaibrois, Melvin L. Esrig

International Conference on Case Histories in Geotechnical Engineering

This paper describes the construction of the foundation system for a 52-story apartment building between Duane Street and Thomas Street (the Tribeca Tower) in the City of New York and the design and implementation of a protection program for a 130-year old designated landmark building founded on a stone "rubble" wall foundation adjacent to the Tribeca Tower.

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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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Uplift Load Tests On Driven Piles, J. R. Davie, M. R. Lewis, L. W. Young Jun 1993

Uplift Load Tests On Driven Piles, J. R. Davie, M. R. Lewis, L. W. Young

International Conference on Case Histories in Geotechnical Engineering

Details and results of uplift load tests on 25 piles at 15 sites are presented. The allowable uplift load on each pile determined from the BOCA code criterion is compared with an allowable capacity based on small movements at design load. In the majority of cases, the BOCA capacities are significantly lower.

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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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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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Case History Of An Uplift Problem, J. R. Deutekom, R. J. Termaat Jun 1993

Case History Of An Uplift Problem, J. R. Deutekom, R. J. Termaat

International Conference on Case Histories in Geotechnical Engineering

Deformation and related stability problems of dikes in the western parts of Holland were for many years ascribed to creep and excess pore water pressures only. However in the spring of 1988 during a high water period in the river Rhine the so called uplift mechanism was for the first time measured in practice. It was then recognised that in some cases the problems have been caused by the uplift phenomenon. For a few years the pore water pressures and the deformations were observed in a test site. With the results of the observations a procedure was formulated for design …

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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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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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