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Articles 5281 - 5310 of 7869

Full-Text Articles in Civil and Environmental Engineering

Behavior Of Braced Sheetpile Excavation In Detroit Clay, H. Abedi, T. G. Porter, B. H. Lien, J. A. Ramos Jun 1993

Behavior Of Braced Sheetpile Excavation In Detroit Clay, H. Abedi, T. G. Porter, B. H. Lien, J. A. Ramos

International Conference on Case Histories in Geotechnical Engineering

This paper presents the design criteria, finite element modeling and actual behavior of a braced sheetpile excavation in Detroit soft clay. Due to the close proximity of existing structures to the excavation, a detailed analysis was performed to design and construct an earth retention system to avoid damage to these structures. The excavation involved a 170 ft by 220 ft area. The maximum depth of excavation was 23.5 ft. The subsurface soil consists of soft to very soft Detroit clay from the excavation level to a depth of 80 ft and has an undrained shear strength as low as 360 …

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Behavior Of Deep Excavations Using Sheet Pile Bracing System In Soft Bangkok Clay, Wanchai Teparaksa Jun 1993

Behavior Of Deep Excavations Using Sheet Pile Bracing System In Soft Bangkok Clay, Wanchai Teparaksa

International Conference on Case Histories in Geotechnical Engineering

The sheet pile bracing system is the most well-known for excavation work in Bangkok soft marine clay. The sheet pile wall which is defined as flexible wall will show a large significant of lateral deformation and ground surface settlement if the excavation system is carried out without a good quality control. The sheet pile bracing system with fully effective preloading strut system was designed for basement excavation of 11.3 m. deep of Bai Yok Tower II. The results indicate that berm width can reduce the maximum sheet pile wall deflection only at the first three stages of excavation. The fully …

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Braced Excavation At The Nipsco Bailly Station Power Plant, J. D. Bray, R. J. Deschamps, Ad. J. Augello, R. S. Parkison Jun 1993

Braced Excavation At The Nipsco Bailly Station Power Plant, J. D. Bray, R. J. Deschamps, Ad. J. Augello, R. S. Parkison

International Conference on Case Histories in Geotechnical Engineering

In July 1991, the intake and discharge pipelines of a major power plant collapsed. A 60-ft. deep excavation adjacent to several structures sensitive to ground movements was required- for remediation. Based on conventional analyses, the estimated factor of safety against base heave was close to 1. 0 for the required excavation, and there was grave concern for damage to appurtenant structures. A viable reconstruction scheme was developed through the integration of finite element analyses and construction monitoring.

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Dewatering Of A Large Excavation Pit By Wellpoints, M. U. Ergun, M. S. Nalçakan Jun 1993

Dewatering Of A Large Excavation Pit By Wellpoints, M. U. Ergun, M. S. Nalçakan

International Conference on Case Histories in Geotechnical Engineering

An excavation, rectangular in dimensions of 55 m x 95 m at the base and approximately 120 m x 160 m at the ground surface was made possible by the use of multi-staged wellpoint dewatering system. Groundwater table was lowered more than 20 meters using four stage wellpoint system to construct the main wastewater pump station for the city of Izmir. The most significant soil parameter affecting the planning and design of the dewatering work is the coefficient of field permeability, and it has been directly measured by a large scale pumping test at the site. During dewatering and construction …

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Performance Of A Pier Consisting Of Three Sections, Edwin P. Woo, Cetin Soydemir, Thomas K. Liu Jun 1993

Performance Of A Pier Consisting Of Three Sections, Edwin P. Woo, Cetin Soydemir, Thomas K. Liu

International Conference on Case Histories in Geotechnical Engineering

A deteriorated 600 ft. long pier in Quincy, Massachusetts consisting of timber pile supported relieving platform and anchored steel sheet pile bulkhead sections was replaced with a new pier. The majority of the new pier consists of a deadman anchored steel sheet pile bulkhead. Due to the proximity of adjacent structures and another existing pier, two areas along the new pier could not accommodate an anchored bulkhead system. In these two areas, relieving platform and double steel sheet pile wall systems were constructed. Inclinometer data showing horizontal movements in the sheeting during the construction and post-construction periods are presented.

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Performance Of A Semi-Rigid Braced Excavation In Soft Clay, B. H. Lien, H. Abedi, J. A. Ramos, T. G. Porter Jun 1993

Performance Of A Semi-Rigid Braced Excavation In Soft Clay, B. H. Lien, H. Abedi, J. A. Ramos, T. G. Porter

International Conference on Case Histories in Geotechnical Engineering

Construction of a 21-foot wide, 28-foot deep braced excavation in Detroit soft clays has been completed. In order to protect an existing 50-year old tunnel adjacent to the excavation, a semi-rigid, tangent wall earth retention system was constructed to minimize the soil movements. The tangent wall was formed by 118 drilled piers with 42-inch in diameter and 41-foot long. The maximum soil lateral and vertical movements adjacent to the excavation were controlled below a magnitude of 2.0 inches, while bottom of the excavation experienced about 3 inches of heave. This paper presents the design considerations and construction performance of the …

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Reinforced Soil Structure Test Sections In Mountainous Terrain, Pichit Jamnongpipatkul, Yongyuth Taesiri, Voranit Charumas Jun 1993

Reinforced Soil Structure Test Sections In Mountainous Terrain, Pichit Jamnongpipatkul, Yongyuth Taesiri, Voranit Charumas

International Conference on Case Histories in Geotechnical Engineering

Reinforced soil structure test sections have been constructed along the alignment of the highway route no 1149 leading to the top of a mountain in Chiang Rai Province, northern Thailand. The test sections are located on the steep slope of residual soil derived from diorite, divided into two subsections for a total length 9f about 300 m. Their heights vary up to twelve meters. The face slope is 70 degrees, initially protected with soil bags and finally with grasses and creepers. The reinforced element is high tensile strength polymer grid composing of "Tensar" SR 55, SR 80 and SR 110. …

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"Unconventional" Drilled Pier Underpinning, Robin M. Lim, Michael Majchrzak Jun 1993

"Unconventional" Drilled Pier Underpinning, Robin M. Lim, Michael Majchrzak

International Conference on Case Histories in Geotechnical Engineering

An “unconventional” earth retaining system consisting of drilled underpinning piers, was used successfully to underpin a four- story building in Redwood City, California. Considerations to other conventional underpinning systems and their feasibility at the subject site are also examined. An in-depth discussion of the "unconventional" underpinning system selected for the project is presented with details of the construction sequence and difficulties encountered. Post-construction performance of the underpinning system and the relative costs of the “unconventional” underpinning system are also presented.

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Underpinning Of A Tilted Building, A Case History, Ch. Marangos Jun 1993

Underpinning Of A Tilted Building, A Case History, Ch. Marangos

International Conference on Case Histories in Geotechnical Engineering

In the paper, the case history of underpinning of a tilted four-storey building located near Kastoria lake, Greece, is presented. Based on geotechnical investigation results, the causes of tilting and the further behaviour of the building are investigated and the underpinning system is also presented.

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Construction Of Pedestrian Tunnels, Essex Junction, Vt, B. F. Townsend, A. D. Walker Jun 1993

Construction Of Pedestrian Tunnels, Essex Junction, Vt, B. F. Townsend, A. D. Walker

International Conference on Case Histories in Geotechnical Engineering

A combination of innovative tunnel engineering concepts and ground improvement technologies are described as applied to an IBM facility in Vermont, with emphasis on the geotechnical aspects of the construction. By this approach, emergency access and egress tunnels were built through difficult soils beneath the slab on grade of a vibration sensitive manufacturing building, with minimal disruption to daily operations.

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Geotechnology Allows Construction Of Two Cohabirating Projects, W. A. Bischoff, M. L. Larson, S. S. Huang Jun 1993

Geotechnology Allows Construction Of Two Cohabirating Projects, W. A. Bischoff, M. L. Larson, S. S. Huang

International Conference on Case Histories in Geotechnical Engineering

The following case history presents innovative geotechnical solutions which allowed the simultaneous construction of two overlapping projects, by two different contractors, sponsored by different governmental agencies under tight project schedules. A settlement sensitive Light Rail Transit (LRT) line was to cohabitate the same alignment as a new freeway with embankment heights of 27 feet; both of which are on compressible and weak subgrade soils. Construction activities could not impinge on one or anothers project. The geotechnical concepts used allowed the two projects to proceed simultaneously and minimized the impacts of embankment induced settlement on the two LRT tracks. Field monitoring …

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Recognition And Delineation Of A Landslide, Turkey, Lester M. Tyrala Jun 1993

Recognition And Delineation Of A Landslide, Turkey, Lester M. Tyrala

International Conference on Case Histories in Geotechnical Engineering

Geological mapping, geophysical surveys, test pits, and shallow borings were used to identify and evaluate a site containing a landslide complex. An investigation was performed to characterize the extent and nature of the complex, determine the susceptibility to movement, and the potential for impact on a nearby proposed reservoir and dam. The methods of investigation established a relationship between the morphology, geology, and hydrology of the slide complex. The surface of the slide was initially identified by a series of scarps, seeps, and slopes. Seismic refraction and resistivity surveys were performed to determine depths to the basal failure surface and …

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General Report Session No. 6: Case Histories Of Geotechnical Engineering And Rock Engineering, Charles J. Haas Jun 1993

General Report Session No. 6: Case Histories Of Geotechnical Engineering And Rock Engineering, Charles J. Haas

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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General Report Session No. 7: Case Histories Of Soil Improvement, Grouting, Geosynthetics, Dynamic Compaction, Vibroflotation, Blasting, And Other Methods, Donald Anderson, B. G. Rao, S. Yasuda, R. Jewell Jun 1993

General Report Session No. 7: Case Histories Of Soil Improvement, Grouting, Geosynthetics, Dynamic Compaction, Vibroflotation, Blasting, And Other Methods, Donald Anderson, B. G. Rao, S. Yasuda, R. Jewell

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Discussions And Replies Session 7, E. C. Shin, C. A. Dougherty, Aswath V. Rao, J. Blayne Kirsch, Arthur Pengelly, Kou-Roung Chang, Kenji Hayashi Jun 1993

Discussions And Replies Session 7, E. C. Shin, C. A. Dougherty, Aswath V. Rao, J. Blayne Kirsch, Arthur Pengelly, Kou-Roung Chang, Kenji Hayashi

International Conference on Case Histories in Geotechnical Engineering

No abstract provided.

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Foundation Grouting For The Forks Of Butte Powerhouse, K. D. Weaver, T. R. Kolbe, S. J. Klein Jun 1993

Foundation Grouting For The Forks Of Butte Powerhouse, K. D. Weaver, T. R. Kolbe, S. J. Klein

International Conference on Case Histories in Geotechnical Engineering

Construction of a powerhouse on unconsolidated landslide debris materials at the edge of a stream channel in a narrow, steep-sided canyon in northern California entailed application of an unusual combination of grouting techniques to protect the foundation during peak flows. These techniques included permeation grouting, displacement grouting, compaction grouting, and controlled hydrofracture grouting.

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Dynamic Compaction Prepares Supermarket Site, Nathan L. Whetten Jun 1993

Dynamic Compaction Prepares Supermarket Site, Nathan L. Whetten

International Conference on Case Histories in Geotechnical Engineering

This paper presents a case in which dynamic compaction (DC) was used as site preparation for a proposed supermarket. The site was located immediately adjacent to a steep, 15 ft. high slope leading down to the Hudson River. Test borings revealed subsurface conditions consisting of uncontrolled miscellaneous fill extending 10 ft. below river level. Stability evaluations indicated that the slope was unstable under rapid drawdown conditions, and placement of the supermarket at the crest of the slope further decreased its stability. There were also concerns regarding possible differential settlement of the supermarket due to the variability of the fill. Dynamic …

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Use Of Geotextiles In Low Volume Roads — A Case Study, A. V. S. R. Murty, Sudhir Mathur, S. K. Soni, K. Nageswara Rao Jun 1993

Use Of Geotextiles In Low Volume Roads — A Case Study, A. V. S. R. Murty, Sudhir Mathur, S. K. Soni, K. Nageswara Rao

International Conference on Case Histories in Geotechnical Engineering

The application of geotextiles has been well accepted as a construction material in Civil engineering works. However, in India, the utility of geotextiles is very limited to particular areas of application in Civil Engineering such as highways, railways and irrigation projects etc. On an experimental basis, these fabrics have been used as an intermediate layer between subgrade and subbase to serve as a separation and drainage layer in a road constructed on soft subgrade soil. The main objective of field trials was to study the need, relevance and the relative efficacy of the use of geotextiles as compared to the …

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Chemical And Lime Stabilization Of Expansive Clay, L. D. Johnson Jun 1993

Chemical And Lime Stabilization Of Expansive Clay, L. D. Johnson

International Conference on Case Histories in Geotechnical Engineering

Two soil stabilization treatments were performed on highly expansive clay in Fort Sam Houston San Antonio, TX, to reduce the potential for swell. Lime slurry pressure injection is considered primarily a preswell treatment with some clay alteration. Chemical injection using a proprietary potassium based chemical is considered to alter the clay. Both treatments effectively reduced the potential for swell.

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Soft Clay Ground Improvement Of Ningbo International Airport, X. R. Zhu, Q. Y. Pan, K. H. Xie Jun 1993

Soft Clay Ground Improvement Of Ningbo International Airport, X. R. Zhu, Q. Y. Pan, K. H. Xie

International Conference on Case Histories in Geotechnical Engineering

Ningbo International Airport is built on the soft clay ground first in China. It has a runway 3,000m in length and 45m in width. The thickness of soft clay is greater than 32m. The calculating consolidation settlement is 0. 48m, far beyond to allowable limit. The soft clay ground is improved by wick drain and surcharge precompression. The airport has been put in service since July, 1990. The process and the results of a full scale embankment test, the ground improvement and the settlement observation are described. The influence of the smear and the well resistance of the wick drain …

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Soil Improvement Method Using Low Strength Pile With Permeability, Yoshio Wakame, Masato Majima Jun 1993

Soil Improvement Method Using Low Strength Pile With Permeability, Yoshio Wakame, Masato Majima

International Conference on Case Histories in Geotechnical Engineering

In order to reduce differential settlement and prevent heaving of surrounding ground due to fill loading, a new method using low strength pile with permeability has been devised. The pile material have been composed of hydraulic granulated slag and 12-20% cement of slag. After the design method having been presented on basis of model loading test result, soil improvement have been put to practical use with sand drain method. As a result, it have been confirmed that this method has been effective for reduction settlement, prevention heaving and same drainage as sand drain method.

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Field Measurements Of A Diaphragm Wall Foundation, T. Matsui, H. Nakajima, T. Nagano, T. Hosoi, Y. Fukuda, K. Hayashi Jun 1993

Field Measurements Of A Diaphragm Wall Foundation, T. Matsui, H. Nakajima, T. Nagano, T. Hosoi, Y. Fukuda, K. Hayashi

International Conference on Case Histories in Geotechnical Engineering

Field measurements of a small-sectioned diaphragm wall foundation for a highway bridge have been performed to understand the stability of the trench wall during construction. In this paper, a case history on the field measurements of the diaphragm wall foundation during deep trench excavation is presented.

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Soil Improvements Of An Inhomogeneous Reclaimed Ground, Sasumu Yasuda, Hiroshi Suzuki, Hideotoshi Takemoto, Kohi Hayashi, Kazuo Saito, Naomi Ine Jun 1993

Soil Improvements Of An Inhomogeneous Reclaimed Ground, Sasumu Yasuda, Hiroshi Suzuki, Hideotoshi Takemoto, Kohi Hayashi, Kazuo Saito, Naomi Ine

International Conference on Case Histories in Geotechnical Engineering

A coal storage yard for an electric power plant was to be constructed on reclaimed land in northern Japan. As the reclaimed land consisted of loose sand and soft silt, a deep well excavation method, a dynamic compaction method and a sand compaction method were selected to improve clayey grounds, sandy grounds and intermediate grounds, respectively. After the improvement, no obvious settlement and no liquefaction has been induced.

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Improvement Of Soft Clay For 50000 M3 Oil Storage Tank, Shiming Wu, Yunmin Chen, Wei Feng Jun 1993

Improvement Of Soft Clay For 50000 M3 Oil Storage Tank, Shiming Wu, Yunmin Chen, Wei Feng

International Conference on Case Histories in Geotechnical Engineering

A design of soil improvement for building a petroleum storage tank with a capacity of 50000 M3, and its construction are presented in this paper. Mono-axis deep mixing technique was applied for this project. Laboratory and in-situ test on cemented soil both for static and dynamic properties were conducted, based on which analysis of strength for static and seismic loading can be used for the practice of the project.

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Compaction Columns Field Tests In Heterogeneous Soil Profile, Carlos Blanco, Bernardo Villegas, Jose Sgambatti Jun 1993

Compaction Columns Field Tests In Heterogeneous Soil Profile, Carlos Blanco, Bernardo Villegas, Jose Sgambatti

International Conference on Case Histories in Geotechnical Engineering

Two pilot tests were conducted on two different areas to evaluate the effects of compaction columns on the engineering properties of a sand-clay layered soil profile. In the first field test, 120 stone columns were constructed using vibro replacement and casing-ramming techniques, in a equilateral triangular array with different spacing. In the second field test, 20 stone columns were constructed using casing-ramming technique, in a equilateral triangular array spaced 3m c/ c. In order to evaluate, the stone columns effectiveness and effects, both a detailed in-situ testing and instrumentation programs were planned to be carried out in five different stages. …

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Soil Strengthening Of Sutlej-Yamuna Link Canal Power Houses In Punjab, India, K. C. Verma Jun 1993

Soil Strengthening Of Sutlej-Yamuna Link Canal Power Houses In Punjab, India, K. C. Verma

International Conference on Case Histories in Geotechnical Engineering

Two Hydro Power Houses are under construction on the Sutlej Yamuna Link Canal emanating from river Sutlej at Nangal in the State of Punjab, India. These Power Houses, one (2X18 MW) at Ropar and another (2X7.45Mw) at Rajpura had silty-clay soil strata with heterogeneous dispersion under the Power House. Further bearing capacity of the foundation was much lower than the impressed loads and settlements were heavy, while permissible tilt in the vertical shafts of the Hydro-generating machines is 3 mm in 10M height. So it was necessary to provide strengthening measures at both the sites. For Ropar Hydel Power House …

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Site Geology And Tunneling Methods, S. K. Jain Jun 1993

Site Geology And Tunneling Methods, S. K. Jain

International Conference on Case Histories in Geotechnical Engineering

Site geology, subsurface and ground water conditions play a vital role in the design of underground structures and the selection of appropriate construction methods and equipments. This paper describes a tunnel project where site subsoils and geo-hydrology dictated the use of various tunneling methods employed at the site. The project is an interceptor sewer tunnel in Staten Island, New York, as a part of the Oakwood Beach Water Pollution Control Project, and consists of two pumping stations and approximately 6.5 miles of sewer along Hylan Boulevard, as shown on Figure 1. The diameter of the tunnel varies from 66 to …

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A Study On Electro-Osmotic Consolidation Of Soft Clays, G. Lefebvre, T. V. Pavate Jun 1993

A Study On Electro-Osmotic Consolidation Of Soft Clays, G. Lefebvre, T. V. Pavate

International Conference on Case Histories in Geotechnical Engineering

The effects of an electro-osmotic treatment on a soft sensitive clay from Eastern Canada were examined based on the laboratory tests performed on undisturbed specimens. The interpretation of the tests focus on the non-homogeneity of the treatment, the influence of polarity reversal and strong induration which develops near the anode in addition to the consolidation.

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Building Collapse Due To Shallow Trench Excavation, S. J. Vitton, R. C. Brown Jun 1993

Building Collapse Due To Shallow Trench Excavation, S. J. Vitton, R. C. Brown

International Conference on Case Histories in Geotechnical Engineering

A building collapse is investigated in which a shallow trench, excavated along the length of the building, resulted in the building's collapse. An investigation indicated that the trench had been excavated within 1 ft (0.3 m) of the foundation and that the foundation had been constructed on approximately 7 ft (2.1 m) of soft silty clay with the bottom portion of this soil highly saturated. The bearing capacity of the foundation, prior to excavation, was estimated to have a safety factor as low as 1.5. As a result of the proximity of the trench to the foundation and the soft …

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Development On Florida's Phosphate Mine Lands, W. A. Ericson, L. P. Moore, L. D. Madrid Jun 1993

Development On Florida's Phosphate Mine Lands, W. A. Ericson, L. P. Moore, L. D. Madrid

International Conference on Case Histories in Geotechnical Engineering

A majority of Polk County, in central Florida, has been mined for phosphate in the past. Mining companies use the mined areas to deposit mining wastes such as the tailings sands and highly plastic clay materials that are associated with the beneficiation of phosphate ore. The clays are allowed to consolidate, but often, the resulting solids content or shear strength of the materials is very low even after several tens of years. One such area that was impacted by mining and subsequent clay disposal was to become a mobile home park. The developer did not investigate the subsurface conditions prior …

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