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Oversteepened Slopes Reinforced With Tensar Geogrid, James E. Laier, Robert M. Mattox
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.
Performance Of Lpg Storage Tanks On Ground Improved By Stone Columns, E. R. Farrell, T. L. L. Orr, T. O'Donovan
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 …
Performance Of Prefabricated Drains In Soft Soils, R. David Charles
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 …
Progress In The Use Of Natm For The São Paulo Subway, T. B. Celestino, O. A. Ferrari, C. T. Mitsuse, L. C. Domingues
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 …
Recent Examples Of Cut And Fill Reinforcement On A41-Highway In France, Trân Vô Nhiêm
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 …
Reinforced Soil In The Repair Of Embankment And Cutting Slip Failures, James Paul
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 …
The Performance Behaviour Of A Grain Silo Foundation In Jeddah Supported On Stone Columns, D. L. Jones, G. J. Macdonald, M. H. Golder
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.
The Rehabilitation Of Terminal 2 – A Case History, D. J. Hardin, M. L. Byington, S. V. Mills
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 …
The Use Of Synthetic Liner And/Or Soil-Bentonite Liner For Groundwater Protection, Harl D. Sharma, Paul Kozicki
The Use Of Synthetic Liner And/Or Soil-Bentonite Liner For Groundwater Protection, Harl D. Sharma, Paul Kozicki
International Conference on Case Histories in Geotechnical Engineering
This paper briefly reviews the various liner materials, their properties and applications to prevent contaminate spread into the groundwater. Following this, two cases have been described that cite the use of two liner types for this purpose. One case provides the details of designing the reinforced CPE liner and its under-drainage system to store the fluids at a new petrochemical plant. The second case provides the details of designing and constructing a soil-bentonite liner for aerated lagoon facilities.
Vertical Excavation Below Footing Solved By Compaction Grouting, Harry Grice, Ernest T. Mosley, Richard M. Berry
Vertical Excavation Below Footing Solved By Compaction Grouting, Harry Grice, Ernest T. Mosley, Richard M. Berry
International Conference on Case Histories in Geotechnical Engineering
One of the problems regularly facing engineers in designing additions to buildings or other structures is dealing with excavating for footings directly adjoining existing footings but at a deeper level. This was accomplished in sandy soils economically and quickly for a noted Conference Center in 1983 by using compaction grouting. Compaction piles were utilized to pick up existing loads as well as the horizontal loads which would normally allow the building to tip, settle and crack. We believe this was the first use of compaction piles as "anchor" piles to pick up horizontal loads. By using this process, the sandy …