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Articles 31 - 60 of 351
Full-Text Articles in Engineering
Uplift Bearing Tests And Calculations Of Belled Piles In Loess Of Arid Regions, Liu Wenbai, Zhou Jian, Mongke Tei-Mohr
Uplift Bearing Tests And Calculations Of Belled Piles In Loess Of Arid Regions, Liu Wenbai, Zhou Jian, Mongke Tei-Mohr
International Conference on Case Histories in Geotechnical Engineering
The field prototype tests have been carries out for under-reamed piles bearing uplift loading in the loess of droughty area. In these tests, uplift displacement and horizontal displacement of under-reamed piles bearing uplift loading and horizontal loading, displacement of surface layer soil, relationship of loading and displacement were measured. The ultimate uplift bearing capacity, failure mechanism of piles were studied. It is very effective on improving ultimate uplift bearing capacity of pile to raise height of belled-out section of under-reamed piles. Strength failure mechanism of pile and soil is solved by gradually failure to be due to damage softening and …
Deep Foundations For New International Airport Passenger Terminal Complex In Bangkok, Ingo Fox, Mangtao Du, Stephen Buttling
Deep Foundations For New International Airport Passenger Terminal Complex In Bangkok, Ingo Fox, Mangtao Du, Stephen Buttling
International Conference on Case Histories in Geotechnical Engineering
The foundation of the terminal in the Second Bangkok International Airport consists of over 25,000 bored piles (drilled shafts) and prestressed concrete cylinder driven piles installed in a complex stratified subsurface formation of soft and stiff clays interbedded by silty sands. A train tunnel to be located underneath the main terminal is a cut-and-cover tunnel supported on its sides by 1-meter thick reinforced concrete diaphragm walls and at the bottom a 2-meter thick basal slab. Particular technical challenges existed in the long-term settlement and potential downdrag caused by changes in effective overburden stresses as a result of excessive pumping of …
Settlement Back-Analysis Of Buildings On Soft Soil In Southern Germany, H.-G. Kempfert, B. Soumaya
Settlement Back-Analysis Of Buildings On Soft Soil In Southern Germany, H.-G. Kempfert, B. Soumaya
International Conference on Case Histories in Geotechnical Engineering
This paper presents 10 case-histories of buildings on soft clay in southern Germany. A lot of field observations show that the calculated settlements using the routine analysis are on average 50 % larger than settlements actually measured in this area. A back-analysis is carried out to verify the soil parameters which are intended to investigate in the subsurface exploration phase and later in a laboratory test program. Recommendations for the engineering practice are suggested to review the determination of compressibility parameters and, consequently, to improve the settlement prediction.
Design And Installation Of Foundations In Various Ground Conditions At Four Power Stations In The U.K., Christopher D. Parks, David E. Jones, José L. M. Clemente
Design And Installation Of Foundations In Various Ground Conditions At Four Power Stations In The U.K., Christopher D. Parks, David E. Jones, José L. M. Clemente
International Conference on Case Histories in Geotechnical Engineering
The design and installation of safe and economic foundation solutions for large projects is of great importance in contributing to commercial success. On four recent power projects in the U.K., a variety of foundation solutions have been adopted, driven largely by the particular ground conditions encountered at each location. All four projects were gas fired combined cycle power station facilities and each location provided unique challenges in both the design and installation of the foundations. The variety of foundation soils encountered was diverse; soft alluvial peat and clay, loose to medium dense silty sands and moderately weak to moderately strong …
Investigation Of Structural Damage In A Corrosive Environment: A Case Study, Joanna L. Meldrum, Akshay Gupta, Brian Mcdonald
Investigation Of Structural Damage In A Corrosive Environment: A Case Study, Joanna L. Meldrum, Akshay Gupta, Brian Mcdonald
International Conference on Case Histories in Geotechnical Engineering
This paper presents the methodology and results of an investigation into the causes of structural damage to a reinforced concrete block wall building in Lake Havasu City, Arizona. The structural damage was in the form of cracking and spalling of the lower courses of the block along the building perimeter. The structural damage to the building had been incorrectly attributed to the Hector Mine Earthquake by another investigator. An evaluation of the response of the building to the estimated level of ground shaking, coupled with site observations, conclusively ruled out the earthquake ground shaking as a cause for the structural …
Micropiles For Support Of Heavy Crane Ring Foundation, José L. M. Clemente, John R. Davie, Peter Nufer, Myron Anderson
Micropiles For Support Of Heavy Crane Ring Foundation, José L. M. Clemente, John R. Davie, Peter Nufer, Myron Anderson
International Conference on Case Histories in Geotechnical Engineering
The replacement of a steam generator at a nuclear power plant was accomplished with the use of a massive crane, believed to be one of the largest available cranes in the world market. Four steam generators were replaced, with each generator weighing 3.2 MN. The crane used for the job had a circular support that required a ring foundation. The crane support imposed huge loads on the ring foundation. Because of the presence of soft to medium stiff clayey fill on one side of the ring foundation, the load-sensitive nature of existing underground safetyrelated duct banks, and the nature of …
Settlements Of Three Buildings Founded On Stratified Soils, Enrico Conte, Giovanni Dente, Antonello Troncone
Settlements Of Three Buildings Founded On Stratified Soils, Enrico Conte, Giovanni Dente, Antonello Troncone
International Conference on Case Histories in Geotechnical Engineering
This paper describes the movements experienced by three residential buildings located in Avellino (South Italy). A common feature of the buildings is the unsymmetrical superstructure that, for lack of construction joints, makes the resultant of the vertical loads on foundation to be highly eccentric. At the end of December 1983, when most of the dead loads had been applied, the buildings exhibited conspicuous settlements, so construction was stopped and the vertical displacement of several points of the foundation was measured during a period of almost one year. The subsoil was investigated by boreholes, CPT and conventional laboratory tests; it consists …
New Exhibition Hall 3 In Frankfurt – Case History Of A Combined Pile-Raft Foundation Subjected To Horizontal Load, Rolf Katzenbach, Jens Turek
New Exhibition Hall 3 In Frankfurt – Case History Of A Combined Pile-Raft Foundation Subjected To Horizontal Load, Rolf Katzenbach, Jens Turek
International Conference on Case Histories in Geotechnical Engineering
Concerning the load bearing behaviour of vertical loaded Combined Pile-Raft Foundations (CPRFs) many studies and publications are available whereas for CPRFs subjected to horizontal or inclined loads scientific results or case histories are very rare. But also for horizontal loading it is possible to obtain a very economic foundation design and to reduce the movements by using a CPRF. Following a theoretical illustration of the load bearing behaviour of a CPRF subjected to horizontal loads the paper is focused on the new exhibition hall 3 in Frankfurt am Main. With a length of 210 m, a width of 130 m …
High-Rise Buildings In Germany Soil-Structure Interaction Of Deep Foundations, Rolf Katzenbach, Alexander Schmitt
High-Rise Buildings In Germany Soil-Structure Interaction Of Deep Foundations, Rolf Katzenbach, Alexander Schmitt
International Conference on Case Histories in Geotechnical Engineering
When considering foundations for high-rise buildings in urban areas a major task is the reduction of settlements and differential settlements of new structures and adjacent buildings to ensure their safety and serviceability. In many cases the soil conditions can lead to deep foundations in order to transfer the high loads of the buildings into deep soil strata with higher bearing capacities. Compared to traditional pile foundations where building loads are assumed to be transferred to the soil only by piles, the Combined Pile-Raft Foundation (CPRF) consists of the three bearing elements piles, raft and subsoil. The load share between piles …
Dynamic Soil-Structure Interaction In Low-Rise Buildings From Seismic Records, Kazuya Mitsuji, Madan B. Karkee, Yoshihiro Sugimura
Dynamic Soil-Structure Interaction In Low-Rise Buildings From Seismic Records, Kazuya Mitsuji, Madan B. Karkee, Yoshihiro Sugimura
International Conference on Case Histories in Geotechnical Engineering
This case study involves analysis of seismic records observation at two adjacent buildings, similarly constructed except that one is fitted with the base isolation system, to investigate the nature of soil-structure interaction mechanism involved. Altogether 19 earthquake records with maximum acceleration of over 10 cm/s2 are selected for the analyses. The south face of the building site slopes downward at an angle of about 20 degrees, which may contribute to topographical effect in wave propagation through the ground. Effects of the surface irregularity to the observed records are also discussed based on the interrelation between peak values of acceleration, …
Surcharge Fill And Vertical Drain System Improves Soft Clay Site, Mark M. Petersen, Gary J. Van Riessen
Surcharge Fill And Vertical Drain System Improves Soft Clay Site, Mark M. Petersen, Gary J. Van Riessen
International Conference on Case Histories in Geotechnical Engineering
The Intermountain Power Project in Delta, Utah required construction of a Railcar Service Center near Provo, Utah. Preliminary investigations related to the design of the proposed facility revealed the presence of soft clays at the site adjacent to the foothills of the Wasatch Mountains. Detailed geotechnical laboratory and field investigations were performed using relatively undisturbed California samples, thin-walled Shelby tube samples, and cone penetration test soundings. The detailed investigations revealed the presence of a significant layer of deep, soft varved clay. This soft clay layer originated from alluvial deposits from the old Lake Bonneville. Because of the need to develop …
Design And Construction Of A Support Of Excavation System For A Deep Cut-And-Cover Tunnel In Downtown Boston, Yousef Alostaz, Abdol Hagh, Jack Pecora
Design And Construction Of A Support Of Excavation System For A Deep Cut-And-Cover Tunnel In Downtown Boston, Yousef Alostaz, Abdol Hagh, Jack Pecora
International Conference on Case Histories in Geotechnical Engineering
This paper presents the analysis, design, implementation and construction of a Value Engineering Cost Proposal (VECP) for the support of excavation system for parts of the underground Central Artery Tunnel in downtown Boston. The excavation varies between about 130 ft and 240 ft in width and between 60 ft and 100 ft in depth. The typical structure of the tunnel consists of soldier pile tremie concrete (SPTC) walls, roof girders with a cast-in place (CIP) concrete slab and a CIP invert slab. The SPTC walls, constructed using the bentonite slurry technique, act as the temporary earth-support structure as well as …
Emergency Underpinning And Repositioning Of A Four-Story Office Building, Jesús Gómez, Russ Preuss, Allen Cadden
Emergency Underpinning And Repositioning Of A Four-Story Office Building, Jesús Gómez, Russ Preuss, Allen Cadden
International Conference on Case Histories in Geotechnical Engineering
A three-story office building was located above a 35-ft slope and was supported on spread footings. The corner of the building nearest the crest of the slope experienced several inches of settlement. A subsurface exploration revealed that this portion of the building was founded on recently placed, soft fill soils. Apart from being easily noticeable on the brick veneer façade, the distress also caused serious concerns on the part of the occupants and owner regarding the continuous operability of the structure, which served as a main hub for wireless communications. A repair plan was developed that consisted of installation of …
Dynamic Characterization Of The Doremus Avenue Bridge Substructure, Nenad Gucunski, Martina Balic, Ali Maher, Hani H. Nassif
Dynamic Characterization Of The Doremus Avenue Bridge Substructure, Nenad Gucunski, Martina Balic, Ali Maher, Hani H. Nassif
International Conference on Case Histories in Geotechnical Engineering
Dynamic properties of the drilled shaft foundations supporting Doremus Avenue Bridge in Newark, New Jersey were determined by forced vibration testing. Doremus Avenue Bridge has been selected for instrumentation, testing and monitoring because it is first bridge in New Jersey designed according to LRFD specification. The main objectives of the substructure testing at Doremus Avenue Bridge were: (a) site evaluation with respect to the dynamic soil properties, and, (b) shaft evaluation for the purpose of definition of their dynamic stiffness. The site characterization entailed crosshole testing for the purpose of evaluation of the shear modulus profile. The drilled shaft impedance …
Skin Friction Resistance Of Auger Cast-In-Place Piles In Texas Gulf Coast Soils, Pramod M. Rao, K. Mohan Vennalaganti, Shailendra N. Endley, Karun Sreerama
Skin Friction Resistance Of Auger Cast-In-Place Piles In Texas Gulf Coast Soils, Pramod M. Rao, K. Mohan Vennalaganti, Shailendra N. Endley, Karun Sreerama
International Conference on Case Histories in Geotechnical Engineering
Auger Cast In Place (ACIP) Piles have been used increasingly for various types of projects including industrial and commercial buildings, multi-story parking garages, docks and other structures. The performance of auger cast in place piles is dependent on several factors including the soil type, rate of auger extraction and pumping of grout, grout strength, grout pressures and grout ratio. Performance of piles can be judged by pile load tests performed on test piles constructed under similar conditions. This paper presents case studies involving eight pile load tests performed on auger cast piles installed at four different sites in Texas Gulf …
Foundations Over Salt-Encrusted Flats (Sabkha): Profiles, Properties, And Design Guidelines, Waddah Akili
Foundations Over Salt-Encrusted Flats (Sabkha): Profiles, Properties, And Design Guidelines, Waddah Akili
International Conference on Case Histories in Geotechnical Engineering
The evaporative and sedimentary environment that has prevailed over the southern shores of the Arabian Gulf region (eastern Saudi Arabia, Qatar, and United Arab Emirates) has produced salt-encrusted flat areas known in Arabic as “sabkha”. Building activities on sabkha areas have posed problems and challenges to the construction industry triggered primarily by the excessive salts present in both the sediments and their shallow ground waters. The paper sheds light on the general setting of sabkha, including: its development, its geology, its hydrogeology and the make up of its sediments. In general, sabkha sediments are cemented and uncemented layers of sand …
Analysis Of The Behavior Of The Piled Foundations Of A Group Of Earthquake Damaged Buildings, Francesco Castelli, Michele Maugeri
Analysis Of The Behavior Of The Piled Foundations Of A Group Of Earthquake Damaged Buildings, Francesco Castelli, Michele Maugeri
International Conference on Case Histories in Geotechnical Engineering
The Sicilian earthquake of 13th December, 1990 was not very strong, but it caused considerable damages on structures, included a group of reinforced concrete buildings located in Augusta town on the east coast of Sicily (Italy). To evaluate the possibility to repair these buildings, an investigation on soil, structures and foundations was carried out. As some buildings were founded on piles, load tests on piles of the piled foundations were carried out. The site was well investigated by means of laboratory and in-situ tests including: standard penetration tests, cone penetration tests, dilatometer tests and seismic tests. To evaluate dynamic stress-strain …
Increase In Pile Capacity With Time In Missouri River Alluvium, Paul J. Axtell, Jacob W. Owen, Scott D. Vollink
Increase In Pile Capacity With Time In Missouri River Alluvium, Paul J. Axtell, Jacob W. Owen, Scott D. Vollink
International Conference on Case Histories in Geotechnical Engineering
The data measured in this study suggest that the increase in compressive pile capacity for a 42-ft long, HP14x102 pile, in a predominantly fine-grained Missouri River alluvium soil profile, increases by about 16 percent from days seven to forty-four after driving. It appears evident that Davisson’s (1973) failure criteria seems to agree fairly well with the observed plunging failure of two compressive pile-load failure tests performed in Missouri River alluvium. By comparison of compressive proof and failure tests performed on day forty-four after driving, it appears that loading a pile to some degree prior to failure, and then reloading the …
Investigations Of Settlement Of Piled Raft Foundation, A. Tejchman, K. Gwizdała, A. Słabek
Investigations Of Settlement Of Piled Raft Foundation, A. Tejchman, K. Gwizdała, A. Słabek
International Conference on Case Histories in Geotechnical Engineering
On the Tychy Brewery site a set of 6 tanks of the diameter varying from 5.4 m to 17 m was designed. The tanks are elements of Sewage Treatment Plant. Due to unfavourable soil conditions (plastic clay) the tanks were founded on 15 m long CFA piles with the diameter of 400 and 600 mm. In order to save construction costs piled raft foundation system was proposed. Based on the analysis and respective calculations it was assumed that raft foundations, founded of gravel fill under each tank, would bear up to 20 % to 30% of total load. The assumption …
Steel Pipe Pile Design, Installation, And Dynamic Testing For A New Pier In Georgetown, Sc, Edward L. Hajduk, William B. Wright, Thomas J. Casey, Robert E. Dullanty
Steel Pipe Pile Design, Installation, And Dynamic Testing For A New Pier In Georgetown, Sc, Edward L. Hajduk, William B. Wright, Thomas J. Casey, Robert E. Dullanty
International Conference on Case Histories in Geotechnical Engineering
A new pier extension was constructed for the South Carolina State Ports Authority (SCSPA) at Pier 31C in Georgetown, South Carolina. This pier was founded on 28 steel open ended pipe (OEP) piles driven into the underlying limestone and silts of the Pee Dee Formation. To account for the expected high lateral loads the new pier may experience during ship impacts and movements, both vertical and batter piles were installed. To the authors’ knowledge, this is the first application of steel open ended pipe piles as a maritime foundation system in the Georgetown, South Carolina area. The soil stratigraphy at …
Deep Foundation Design Near Flood Protection Projects, Scott A. Loehr
Deep Foundation Design Near Flood Protection Projects, Scott A. Loehr
International Conference on Case Histories in Geotechnical Engineering
Flood protection structures (flood walls, pump plants, railroad or vehicular access opening and gatewell structures) have foundations subjected to hydrostatic pressures during flood conditions. The foundation sands below these structures are likely to produce hydrostatic pressure elevation heads which measure higher than the top of ground at the structures. Often the foundations for these structures are deep enough to penetrate the sands into the artesian pressures. Deep foundation design for the flood protection structures utilizes software programs based on load testing in many different types of soils. The load tests used to model soil-structure responses to loading are conducted on …
Use Of Straight Shaft Piers As Settlement Reducers In Combined Footing Design Over Chicago Soft Clay, Clyde N. Baker Jr., Tony A. Kiefer, Kolbjorn Saether
Use Of Straight Shaft Piers As Settlement Reducers In Combined Footing Design Over Chicago Soft Clay, Clyde N. Baker Jr., Tony A. Kiefer, Kolbjorn Saether
International Conference on Case Histories in Geotechnical Engineering
The paper describes the design and construction history of a 10-story (with provision for two more stories) combination parking structure and office building cost effectively built over soft clay in Chicago, Illinois. The site profile consisting of medium dense to dense sand and sandy silt underlain by soft compressible clay to a very thin, sometimes non-existent, very stiff to hard clay layer underlain by water bearing very dense sandy silt to limestone bedrock made foundation design within the owner's budget difficult. The development of a unique combination of strip footings in the shallow, medium dense to dense sand layer combined …
Dearborn Center: A Unique Soil Structure Interaction Design, Clyde N. Baker Jr., Ted D. Bushell, Rob Diebold
Dearborn Center: A Unique Soil Structure Interaction Design, Clyde N. Baker Jr., Ted D. Bushell, Rob Diebold
International Conference on Case Histories in Geotechnical Engineering
The paper describes a case history that illustrates a mixed foundation system in which existing caissons which previously supported an 11-story building that had been demolished down to street level, share the load with a mat constructed in the lowest basement level on top of the existing caissons to support a new 38-story office building. The geotechnical investigation to determine the properties of the supporting soil strata is described as well as the material investigation to confirm the integrity of the existing foundations. The soil structure interaction concept developed and the analysis performed is presented. The observed settlement is compared …
Single Foundations Of Framed Buildings And Skeleton Structures In A Compacted Base And Their Horizontal Load Resistance, A. L. Gotman, Yu. M. Shemenkov
Single Foundations Of Framed Buildings And Skeleton Structures In A Compacted Base And Their Horizontal Load Resistance, A. L. Gotman, Yu. M. Shemenkov
International Conference on Case Histories in Geotechnical Engineering
In practice of construction in Russia in case of plastic soils bedding, the cast-in-place foundations are used, constructed in a compacted base in kind of tamping in the soil of the 2-4 m depth pyramidal holes with the subsequent ballast tamping into the hole bottom and placing concrete in the said hole. Such foundations are advisable under the columns of framed buildings and structures. They are significantly more effective comparing to the pile foundations with a cast-in-place raft, as without a raft the volume of excavation works and formwork decreases significantly. While design of such foundations for the framed buildings …
Consideration Of Raft And Soil Interaction In Piled-Rafts Design, N. Z. Gotman, M. I. Makarjev
Consideration Of Raft And Soil Interaction In Piled-Rafts Design, N. Z. Gotman, M. I. Makarjev
International Conference on Case Histories in Geotechnical Engineering
Based on the analysis of the piled-raft foundations, as well as experimental investigations of the geotechnical engineers, it is stated that the load of a piled-raft foundation is transferred both to a raft and a pile. When a piled-raft foundation design, the account of this factor allows the significant decrease of the foundation cost. To work out the method of a piled-raft foundation design, the experimental and numerical investigations have been carried out.The paper gives some results of the experimental and numerical investigations of piled-raft foundations. A method of the evaluation of a load part transferred to a raft and …
Comparison Of Two Ground Modification Techniques To Reduce Settlement, Kenneth R. Bell, John R. Davie
Comparison Of Two Ground Modification Techniques To Reduce Settlement, Kenneth R. Bell, John R. Davie
International Conference on Case Histories in Geotechnical Engineering
At the La Rosita Power Plant site in Mexicali, Mexico, a 3-m thick layer of loose very fine sandy silt was encountered at about 7.5 m depth. Settlement calculations performed for the heavier (150 to 200 kPa) settlement sensitive structures indicated values of up to 65 mm, compared to an allowable settlement of 50 mm. During the design of the base plant, various options for limiting settlement were reviewed. Based on a cost and schedule review, jet grouting of the loose silt layer was chosen. The predicted post-grouting foundation settlement was approximately 35 to 40 mm. During construction of the …
Settlement Of Shallow Foundations Constructed Over Reinforced Soil: Design Estimates Vs. Measurements, Michael Majchrzak, Marshall Lew, Ken Sorensen, Tom Farrell
Settlement Of Shallow Foundations Constructed Over Reinforced Soil: Design Estimates Vs. Measurements, Michael Majchrzak, Marshall Lew, Ken Sorensen, Tom Farrell
International Conference on Case Histories in Geotechnical Engineering
Faced with difficult soil conditions for the support of two 6-story office towers in Dublin, CA and of a 6-story parking garage in Sacramento, CA, engineers recommended the use of Geopier Rammed Aggregate Piers to reinforce the soil for the support of high bearing capacity spread footings instead of deep foundations. Foundation selection for both sites was influenced by long-term settlement performance, schedule and cost savings, and seismic uplift resistance. Rammed aggregate piers were installed to strengthen upper weak and compressible soil layers resulting in a substantially stiffer soil layer on which shallow, high bearing capacity spread footings were constructed. …
Deep Caisson Sinking In Soft Soils, Grand Forks, North Dakota, Gregory R. Fischer, Wayne L. Gerszewski, Frank J. Barchok, Michael K. Yavarow
Deep Caisson Sinking In Soft Soils, Grand Forks, North Dakota, Gregory R. Fischer, Wayne L. Gerszewski, Frank J. Barchok, Michael K. Yavarow
International Conference on Case Histories in Geotechnical Engineering
The City of Grand Forks, North Dakota obtains drinking water from both the Red and Red Lake Rivers using a system of river intakes, shallow pipelines, and pump stations. However, during flood events, the City often loses access to the system, and persistent landslides along the riverbanks easily damage shallow components. As a result, the City decided to construct a gravity system with new pipelines leading to the base of a 65-foot deep pump station. Several construction techniques were evaluated for the pump station, including a self-sinking caisson, which was chosen for the project. Because the proposed 60-foot-diameter caisson was …
Design And Construction Of Large Diameter Impact Driven Pipe Pile Foundations New East Span San Francisco-Oakland Bay Bridge, S. Mohan, V. K. Khotan, R. F. Stevens, M. J. Chacko, M. Kapuskar
Design And Construction Of Large Diameter Impact Driven Pipe Pile Foundations New East Span San Francisco-Oakland Bay Bridge, S. Mohan, V. K. Khotan, R. F. Stevens, M. J. Chacko, M. Kapuskar
International Conference on Case Histories in Geotechnical Engineering
The San Francisco-Oakland Bay Bridge is one of the most heavily traveled bridges in the world. The east span of the bridge will be replaced due to seismic safety concerns. The new bridge will be founded mostly on large 1.8 to 2.5-meter diameter, approximately 60- to 100-meter long pile foundations. American Petroleum Institute (API) method was used for pile design, since the selected foundation type is similar to those used for offshore oil platforms and the subsurface conditions are in many ways similar to those in the Gulf of Mexico. Piles foundations will experience tension loads of up to approximately …
Suction Anchors For Deepwater Moorings At Nkossa And Girassol In 200 And 1,400m Of Water, Jean-Louis Colliat, Hedi Dendani
Suction Anchors For Deepwater Moorings At Nkossa And Girassol In 200 And 1,400m Of Water, Jean-Louis Colliat, Hedi Dendani
International Conference on Case Histories in Geotechnical Engineering
A new type of anchor, composed of steel caissons installed into the soil by suction under-pressure, presently finds a strong interest in the offshore oil industry, in particular for deepwater sites because of its vertical loading capability in taut-leg moorings, and the reduced installation equipment required. Two case histories are presented in the paper, describing the installation of the moorings for the Nkossa barge in Congo in 1995 and for the Girassol FPSO in Angola in 2001. In both cases, the paper gives the general soil conditions and design assumptions, together with the results of the installation operations, with a …