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Articles 181741 - 181770 of 197221

Full-Text Articles in Engineering

Dynamic Compaction – An Unusual Application, Byongmu Song, Michel Gambin Jun 1988

Dynamic Compaction – An Unusual Application, Byongmu Song, Michel Gambin

International Conference on Case Histories in Geotechnical Engineering

The site for the U.S. Air Force 750-bed medical contingency complex which is located approximately 10 miles west of Pusan, Korea is geotechnically adverse. Approximately 30 feet of saturated loose fine sand overlies about 180 feet of Pleistocene fluvial and marine sediments. The upper 90 feet of Pleistocene sediments are in a state of under-consolidation, and moisture contents are generally higher than the liquid limits with SPT N values of about three. 30 feet of loose sand was densified by dynamic compaction and the test results indicated that foundation performance satisfied the contract specifications. A considerable economy, in both cost …

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Effectiveness Of Sand Drains In Peaty Soil In A Case Of Differential Settlement Recovering, C. Mastrantuono, A. Tomiolo, E. Arcangeli Jun 1988

Effectiveness Of Sand Drains In Peaty Soil In A Case Of Differential Settlement Recovering, C. Mastrantuono, A. Tomiolo, E. Arcangeli

International Conference on Case Histories in Geotechnical Engineering

The result obtained in a case history of differential settlement recovery are reported. The effectiveness of sand drains in peaty soil is questioned. The importance and the mutual influence of the primary and secondary settlement are discussed. Remarks are made on the value of secondary settlement coefficient.

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Effects Of Collapse Settlement Of Fill On Reinforced Earth Walls, G. E. Blight Jun 1988

Effects Of Collapse Settlement Of Fill On Reinforced Earth Walls, G. E. Blight

International Conference on Case Histories in Geotechnical Engineering

Two case histories illustrate the effects that collapse settlement of the fill forming a Reinforced Earth wall can have on the structure. Pre-requisites for collapse settlement are inadequate compaction, compaction at too low a water content, or a combination of these. Collapse settlement occurs subsequently when the water content of the fill is increased by infiltration. The effects of collapse settlement identified in this paper are: (i) a temporary release of friction on the reinforcing strips with the result that the wall facing moves outwards; and (ii) relative settlement between the fill and the wall facing with the result that …

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Epoxy Resin Grout System For Solutions To Traditional Geotechnical Problems, A. V. Shroff, D. P. Amin, D. L. Shah Jun 1988

Epoxy Resin Grout System For Solutions To Traditional Geotechnical Problems, A. V. Shroff, D. P. Amin, D. L. Shah

International Conference on Case Histories in Geotechnical Engineering

Use of chemicals for foundation treatment and sealing of crack is of recent origin. The aim of this paper is to find time-viscosity and time-strength relationships of epoxy grout system for proper flow mechanism and strength interaction with rock collected from dam sites of India. The bonding mechanism of gel in the injected mass is explained with the help of Scanning electron microscopy and Infra-red spectroscopy. After trial field grouting the stratascopy has revealed better bonds of moist surface with flexibility to accommodate movement before bond or shear failure occurred and had lower volumetric shrinkage during curing.

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Evaluation Of The Effect Of Saturated Silty And Fine Sand Foundation Improved By Vibro-Flotation In Seismic Area, Wang Yuqing, Zhang Weiquan, Qiao Taiping Jun 1988

Evaluation Of The Effect Of Saturated Silty And Fine Sand Foundation Improved By Vibro-Flotation In Seismic Area, Wang Yuqing, Zhang Weiquan, Qiao Taiping

International Conference on Case Histories in Geotechnical Engineering

The improvement of liquefaction foundations in seismic region has been concerning many engineers. The authors had carried out experimental studies on the improvement of saturated silty and fine sand foundations at the suburbs of Beijing by vibroflotation method. The test results are described and the improvement effects are evaluated in this paper.

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Field Measurement On A Slope Cutting With Tensile Inclusions, Tamotsu Matsui, Ka Ching San, Terumasa Amano, Yoshinori Otani Jun 1988

Field Measurement On A Slope Cutting With Tensile Inclusions, Tamotsu Matsui, Ka Ching San, Terumasa Amano, Yoshinori Otani

International Conference on Case Histories in Geotechnical Engineering

In a road widening project, tensile inclusions were used to stabilize some parts of cut slope works. The site condition and the construction of reinforced slope cutting are presented. A full scale field test on a reinforced cut slope was performed being incorporated with this road widening project. The field test consisted of a field loading test and a field excavation test. Details of the field test, field measurements and site observation are presented. Finite element analysis of the field test is performed. Based on the field measurements together with the analytical results, the reinforcement mechanism of a reinforced cut …

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Foundations On Stone Columns Resting On Coralline Limestone, K. S. A. Rahim, A. W. Dhowian Jun 1988

Foundations On Stone Columns Resting On Coralline Limestone, K. S. A. Rahim, A. W. Dhowian

International Conference on Case Histories in Geotechnical Engineering

The subsoil conditions along the Red Sea coast in Saudi Arabia are complex due to existence of very thick beds of coralline limestone of recent geological origin. These coral beds are soft, porous and nonhomogeneous. They are often interspaced with large cavities and soft sandwiched layers of finer particles. Analysis of the subsoil conditions to a fifty meter depth based on data from deep boreholes, Standard Penetration Tests (SPT), Quasi Static Cone Tests (DCT) and large size Plate Load Tests is presented. The strength and compressibility characteristics of the strata and the correlation factors for the SPT and DCT in …

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Geogrid Reinforced Soil Retaining Wall On Compressible Soils, R. L. Curtis, V. E. Chouery-Curtis, D. A. Miller Jun 1988

Geogrid Reinforced Soil Retaining Wall On Compressible Soils, R. L. Curtis, V. E. Chouery-Curtis, D. A. Miller

International Conference on Case Histories in Geotechnical Engineering

A geogrid reinforced soil wall with a wrap-around facing system was successfully constructed on soft, compressible alluvial and residual soils. An originally designed 20-foot (6.1 m) high, reinforced concrete cantilever retaining wall was not constructed because of the expected settlements induced by the wall and backfill. The geogrid reinforced wall was utilized because of its ability to withstand the estimated settlement and because it was considered less expensive than providing deep foundation support of a cantilever wall. This paper discusses the design, construction, and performance of the geogrid reinforced wall.

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Geotechnical Studies Of Foundation Of A Tilted Tank At Parikshatgarh, India, G. C. Nayak, B. Singh, P. K. Jain Jun 1988

Geotechnical Studies Of Foundation Of A Tilted Tank At Parikshatgarh, India, G. C. Nayak, B. Singh, P. K. Jain

International Conference on Case Histories in Geotechnical Engineering

An overhead tank of 200 KL capacity and 9 m staging was constructed in year 1975 at the ancient historical site at Parikshatgarh, Meerut, India. The depth of foundation is 1.6 m and inner and outer diameters of annular raft is 6.8 m and 10.3 respectively. In year 1978, the overhead tank was observed to be tilted. Detailed geotechnical studies have been conducted in 1987 to find out the causes of tilting of the tank and tilts have been measured every month for last one year. It is interesting to note that in spite of severe tilt of 4.3 cm/meter …

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Long Term Building Performance Over An Injected Subgrade, Ronald F. Reed, Paul Wright Jun 1988

Long Term Building Performance Over An Injected Subgrade, Ronald F. Reed, Paul Wright

International Conference on Case Histories in Geotechnical Engineering

Several foundation designs and stabilization methods are used with varying degrees of success to cope with the problem of expansive clays. Many of these methods are very expensive, therefore alternate technology that is both cost and performance effective has been developed. This paper presents a case history with pre- and post- stabilization test data for a 4-building project where pressure injection of lime and water was used to preswell weathered clay-shale to a depth of 10 feet. Use of pressure injection technology economically reduced post construction movements to 0.5 inches to 1.8 inches over a 7 year monitoring period. Movements …

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Oversteepened Slopes Reinforced With Tensar Geogrid, James E. Laier, Robert M. Mattox Jun 1988

Oversteepened Slopes Reinforced With Tensar Geogrid, James E. Laier, Robert M. Mattox

International Conference on Case Histories in Geotechnical Engineering

This paper describes geotechnical design concepts used in developing 45-degree and 56-degree embankment slopes to meet strict stability criteria. Typical design sections are presented along with example stability computations to illustrate factors of safety developed under static and rapid drawdown conditions. This paper also discusses pertinent, site specific aspects of construction considered germane to successful, long term performance of oversteepened slopes at this site.

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Performance Of Lpg Storage Tanks On Ground Improved By Stone Columns, E. R. Farrell, T. L. L. Orr, T. O'Donovan Jun 1988

Performance Of Lpg Storage Tanks On Ground Improved By Stone Columns, E. R. Farrell, T. L. L. Orr, T. O'Donovan

International Conference on Case Histories in Geotechnical Engineering

This paper describes the construction of four large tanks on poor soil conditions consisting of hydraulic fill placed over estuarine silt in Dublin port. The limited differential settlement that could be tolerated by the tanks required that they could not be placed on the existing ground. The optimum solution was found to be ground treatment using vibro-replacement with the formation of stone columns and compaction of the fill. The paper describes the design method used and the control tests. The predicted settlements are compared with settlement readings of the tanks following construction. These show that the chosen solution has performed …

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Performance Of Prefabricated Drains In Soft Soils, R. David Charles Jun 1988

Performance Of Prefabricated Drains In Soft Soils, R. David Charles

International Conference on Case Histories in Geotechnical Engineering

The use of vertical drains to accelerate the consolidation of soft soils has become a cost effective alternative to the use of pile foundations at many sites. This paper presents a case history of the use of vertical drains to accelerate the consolidation of 20 to 25 feet of low shear strength, highly compressible soils, under embankments of 12 to 25 feet in height. Two separate vertical drain installations at the project site allowed the use of a shallow foundation system for approximately one-half of the foundations. This resulted in a significant savings in foundation costs and allowed an ambitious …

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Progress In The Use Of Natm For The São Paulo Subway, T. B. Celestino, O. A. Ferrari, C. T. Mitsuse, L. C. Domingues Jun 1988

Progress In The Use Of Natm For The São Paulo Subway, T. B. Celestino, O. A. Ferrari, C. T. Mitsuse, L. C. Domingues

International Conference on Case Histories in Geotechnical Engineering

The first time that the New Austrian Tunnelling Method (NATM) was used for underground works in the Sao Paulo Subway was in 1981. Since that time, significant progress has been achieved in successfully optimizing the support and lowering the construction costs. This paper will describe the latest experience of two single-track parallel tunnels excavated in 1986 through tertiary stiff clay. All the experience accumulated in previous jobs led to design improvements, such as (1) no steel ribs for support along 72% of the tunnels length (2) no temporary invert, and (3) no spiles, forepoles, soil grouting or any other type …

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Recent Examples Of Cut And Fill Reinforcement On A41-Highway In France, Trân Vô Nhiêm Jun 1988

Recent Examples Of Cut And Fill Reinforcement On A41-Highway In France, Trân Vô Nhiêm

International Conference on Case Histories in Geotechnical Engineering

At EVIRES PASS, between ANNECY and MONT BLANC in FRANCE, subsoil is made up of unstable clayey natural versants and marly bedrock affected by previous or current slidings. The problems encountered during the new A41-Highway construction were aggravated by the proximity of Road and Railway located on top of the same versant. The final Design consisted of succession of cuts and embankments with special soil reinforcement techniques to improve stability. So two existing unstable Railway embankments were promptly consolidated by "soil nailing" with driven steel dowel-piles which were either anchored or not. Two other high cuts in marls and sandstones …

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Reinforced Soil In The Repair Of Embankment And Cutting Slip Failures, James Paul Jun 1988

Reinforced Soil In The Repair Of Embankment And Cutting Slip Failures, James Paul

International Conference on Case Histories in Geotechnical Engineering

The paper considers the causes of slips in embankments and cuttings and examines the traditional methods of repair and reinstatement. Reinforced soil solutions are examined and compared with the more traditional systems. Following consideration of the structure and properties of a polymer geogrid for use in reinforced soil applications, two case histories are presented. The first involves the repair of a cutting slip in overconsolidated clay in S.E. England. Both the design method and construction system are examined along with indications of relative costs. The second example is a slip in a highway embankment in Sweden where a reinforced soil …

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The Performance Behaviour Of A Grain Silo Foundation In Jeddah Supported On Stone Columns, D. L. Jones, G. J. Macdonald, M. H. Golder Jun 1988

The Performance Behaviour Of A Grain Silo Foundation In Jeddah Supported On Stone Columns, D. L. Jones, G. J. Macdonald, M. H. Golder

International Conference on Case Histories in Geotechnical Engineering

This paper describes the ground treatment carried out and the subsequent load settlement behaviour of a grain silo in Jeddah, Saudi Arabia. Predicted performance based on the results of both SPT and cone penetration tests are compared with actual behaviour. The prediction based on the SPT results is poor, with the cone penetration analyses giving a significant improvement. A knowledge of cone resistance and hence modulus values for the full depth of influence of the silo would have further refined the prediction.

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The Rehabilitation Of Terminal 2 – A Case History, D. J. Hardin, M. L. Byington, S. V. Mills Jun 1988

The Rehabilitation Of Terminal 2 – A Case History, D. J. Hardin, M. L. Byington, S. V. Mills

International Conference on Case Histories in Geotechnical Engineering

The Port of Portland, Oregon recently completed the rehabilitation of the downstream portion of Terminal 2. The project included the placement of more than 1 million cy of dredged hydraulic sand fill and the construction of a 1,400-ft-long pile-supported wharf. Up to 60 ft of sand fill was placed over soft, submerged sediments. The silt along the toe of the slope was removed prior to placing the fill. No shear failures or mudwaves were detected during filling. The fill induced settlements of up to 63 in., which agreed well with the predicted maximum settlement of about 60 in. Underwater sand …

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List Of Conference Participants, Multiple Participants Jun 1988

List Of Conference Participants, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Author's Index, Multiple Authors Jun 1988

Author's Index, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Concluding And Banquet Remarks And Speech, Multiple Authors Jun 1988

Concluding And Banquet Remarks And Speech, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Program Of The Conference, Multiple Participants Jun 1988

Program Of The Conference, Multiple Participants

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Iii, Multiple Authors Jun 1988

Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Iii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Ii, Multiple Authors Jun 1988

Past Proceedings: First International Conference On Case Histories In Geotechnical Engineering (1984): Vol. Ii, Multiple Authors

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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A Study Of Contamination Migration At A Hazardous Waste Facility In Louisiana, George H. Cramer Ii Jun 1988

A Study Of Contamination Migration At A Hazardous Waste Facility In Louisiana, George H. Cramer Ii

International Conference on Case Histories in Geotechnical Engineering

Traditionally clay soils have been regarded as being relatively impermeable to the migration of water and contaminants. Recent studies in Louisiana are beginning to show, however, that laboratory permeability tests are not true indicators of the ability of an in-situ soil to retain or transmit fluids. Both the depositional and post-depositional environment of a soil can greatly alter its in-situ permeability. In particular, post-depositional structural fractures provide preferential pathways for contaminant migration at rates that far exceed those predicted by using laboratory permeability values. Difficulties in field identification of these pathways reduces modeling of their effect on site hydrology to …

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Complementing Radiologic Data With Geology – A Case History, Dennis Mcgrane Jun 1988

Complementing Radiologic Data With Geology – A Case History, Dennis Mcgrane

International Conference on Case Histories in Geotechnical Engineering

The goal in characterizing radioactively contaminated soil is to quantify the degree of contamination and its parameters. A cost effective, small scale characterization is done by performing a surface radiological survey with subsurface data coming from boreholes augered in a tight grid pattern. Confidence in the between-hole extrapolations depends on the grid size. However, at the widely contaminated site in Maywood, New Jersey a grid width of 100 feet was the only economical choice. Accurate contamination parameters were determined despite the wide hole spacings once geologists and health physicists learned how local geologic conditions controlled the contamination's location and extent. …

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Control Of Uplift From Ground Water, R. V. Sarsby Jun 1988

Control Of Uplift From Ground Water, R. V. Sarsby

International Conference on Case Histories in Geotechnical Engineering

This paper relates to the conversion of a disused water reservoir into a landfill site for domestic and industrial refuse. The reservoir was initially subdivided into four cells (by using earth bunds) and three of the cells have been successfully prepared and filled. The fourth cell is the largest and presents the greatest number of geotechnical problems, the major one being the problem of ensuring that leachate does not escape into the groundwater. The first owner of the site removed natural clay from various parts of the reservoir base to seal the first three cells. In doing so he exposed …

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Disposal Of Phenolic Waters From A Producer Gas Plant, Dorairaja Raghu, Hsin-Neng Hsieh Jun 1988

Disposal Of Phenolic Waters From A Producer Gas Plant, Dorairaja Raghu, Hsin-Neng Hsieh

International Conference on Case Histories in Geotechnical Engineering

Phenolic waters are generated in a producer gas plant in India. Since harmful environmental effects can result even with low concentrations of phenol in water, its disposal poses a problem. Four options for disposal were considered. One of these options considered involves disposal in a earthen pond situated close to a river. In order to avoid river pollution by possible seepage of phenolic waste, geotechnical aspects have to be considered. For each option, cost analysis is performed. This paper d1scusses as to how the final disposal technique is decided taking into account all the relevant aspects of the problem.

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Failure And Reconstruction Of A Waste Containment Pond Slope, Dorairaja Raghu, Robert J. Van Orden Jun 1988

Failure And Reconstruction Of A Waste Containment Pond Slope, Dorairaja Raghu, Robert J. Van Orden

International Conference on Case Histories in Geotechnical Engineering

A portion of a slope of a subsurface waste containment cell failed. It is believed that this failure could be attributed to a sudden drawdown condition caused by the pumping of treated wastewater effluent stored inside the cell prior to construction of the permanent liner. This conclusion seems to be in agreement with the results of a stability analysis conducted utilizing post-failure slope profile data. A discussion of the analysis of the failure and the reconstruction of the slope is presented in this paper.

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Geotechnical And Groundwater Site Characterization On The Umtra Project, J. A. Caldwell, R. A. Rager, L. Coons Jun 1988

Geotechnical And Groundwater Site Characterization On The Umtra Project, J. A. Caldwell, R. A. Rager, L. Coons

International Conference on Case Histories in Geotechnical Engineering

Reclamation of 24 inactive uranium mill tailngs piles involves remedial work to stabilize the piles for 1000 years. Site characterization of geotechnical and groundwater conditions at each site is undertaken prior to remedial action design. This paper describes the approach to UMTRA Project site characterization. A case history, Green River, is described. Details of site characterization costs for most sites are provided.

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