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Articles 61 - 90 of 363
Full-Text Articles in Geotechnical Engineering
Synchrotron Facilities: Meeting Stringent Deformation And Vibration Criteria, Jost A. Studer, Rocco Panduri, Hans-Peter Höltschi
Synchrotron Facilities: Meeting Stringent Deformation And Vibration Criteria, Jost A. Studer, Rocco Panduri, Hans-Peter Höltschi
International Conference on Case Histories in Geotechnical Engineering
Synchrotron light source facilities have high demands on admissible deformations and vibrations of the foundation structure during operation. These research facilities are very complex, consisting of pumps, air conditioning equipments, emergency power generators and electrical transformers of several sizes and types. Such equipments are located on the experimental platform itself or in the vicinity of the platform. On the experimental platform, which is usually a ring with a diameter of 100 to 200 m, typical admissible values for the absolute deformations due to static loads (of 500 kg) and dynamic loads (of 100 kg) are in the range of 1 …
The Spread Phenomenon Of A Low Frequency Ground Vibration To Originate In The Highway Bridge And Its Simulation Analysis, Kiyoshi Hayakawa, Ikno Nakaya, Tadanori Nisimura
The Spread Phenomenon Of A Low Frequency Ground Vibration To Originate In The Highway Bridge And Its Simulation Analysis, Kiyoshi Hayakawa, Ikno Nakaya, Tadanori Nisimura
International Conference on Case Histories in Geotechnical Engineering
As for M highway bridge, it had the one for temporary be opened to traffic by July 2004. Because of that, vibration investigation was carried out to investigate this vibration cause. The complaint to face vibration from the nearby private house was sent along with this. While three houses of private houses stand in a line, as for the point which it should pay attention to in the complaint of the former term, central B house shakes sideways, and a left right private house is the point not to be shaking. When it thinks about this point, a certain vibration …
Urban Blasting Vibrations: Case Histories Of Vibration Monitoring In New York City, Asher H. Peltz, Joel L. Volterra, Andrejs Delle, Fred Streichenwein
Urban Blasting Vibrations: Case Histories Of Vibration Monitoring In New York City, Asher H. Peltz, Joel L. Volterra, Andrejs Delle, Fred Streichenwein
International Conference on Case Histories in Geotechnical Engineering
This paper summarizes the monitoring experienced gained from several urban rock blasting projects in New York City and one just beyond the city limits. The majority of the experience was gained on the new South Ferry Terminal Structural Box project that included a new subway terminal station and section of tunnel on the number 1-line subway located in Battery Park in Lower Manhattan. The paper will review lessons learned and the limitations of using “off-the-shelf” seismographs for near-field blast monitoring. We allege that standard and widely available seismograph equipment is not generally utilized to its fullest potential, and that alternative …
Construction Of A Plastic Concrete Seepage Cutoff Wall For The New Coquitlam Dam, L. Yan, D. A. Trapp, A. Sy
Construction Of A Plastic Concrete Seepage Cutoff Wall For The New Coquitlam Dam, L. Yan, D. A. Trapp, A. Sy
International Conference on Case Histories in Geotechnical Engineering
Coquitlam Dam, constructed in the early 1910s, is a 30 m high hydraulic fill embankment. The dam is situated in a region of high seismic hazard in British Columbia, Canada. The existing dam core and shells, and part of the dam foundation are deemed to be liquefiable under the design earthquake. A new 30 m high compacted earth core rockfill embankment dam is currently being constructed at the downstream toe of the existing dam. As part of the construction of the new dam, a seepage cutoff wall has been completed underneath the central core of the new embankment to control …
Deep Excavations In Hard Sandy Clays For Stations And Shafts Of The Athens Metro Stavros Extension, Richard Kulesza, Nikos Boussoulas, W. Allen Marr
Deep Excavations In Hard Sandy Clays For Stations And Shafts Of The Athens Metro Stavros Extension, Richard Kulesza, Nikos Boussoulas, W. Allen Marr
International Conference on Case Histories in Geotechnical Engineering
A 26 m deep excavation in hard sandy clays for the Halandri Station of the Stavros Extension of Athens Metro was completed in 2001. The excavation supporting system and the areas outside the excavation were instrumented. During the design, a finite element analysis of stresses and displacements was performed using soil parameters developed from laboratory and in-situ testing. The measured displacements had a similar distribution with depth as the calculated displacements, but were significantly smaller. An extensive finite element back-analysis was performed, in which the input parameters were varied until the magnitude and the distribution with depth of calculated displacements …
Reconstruction Of Pier Foundations Of The Charles Bridge In Prague, Jan Masopust
Reconstruction Of Pier Foundations Of The Charles Bridge In Prague, Jan Masopust
International Conference on Case Histories in Geotechnical Engineering
The paper deals with the permanent protection of piers No. 8 and 9 of the Charles Bridge in Prague, Czech Republic. The bridge was built in the 14th century to the order of Emperor Charles IV. The bridge has damaged several times during the past 650 years, mainly by flood. Deeply founded and adequately resistant envelope around the foundations of both piers was designed. The envelope consists of the steel micropiles in combination with jet-grouted columns, which were both retracted into the bedrock. Another type of envelope made of Larssen sheet piles was designed for both upstream and downstream pier …
Slurry Trench Stability Analysis – Constructing Cement-Bentonite Slurry Trench Adjacent To Existing Soil-Bentonite Backfill, Xiaohai Wang, François G. Bernardeau, Jean-Claude Younan
Slurry Trench Stability Analysis – Constructing Cement-Bentonite Slurry Trench Adjacent To Existing Soil-Bentonite Backfill, Xiaohai Wang, François G. Bernardeau, Jean-Claude Younan
International Conference on Case Histories in Geotechnical Engineering
Vertical containment walls have been used as barriers to cut off hazardous fluid and chemical flow in the ground at contaminated sites. An application of this technique in South Carolina is to construct a 1.6-mile long containment wall along a dike using cement-bentonite slurry, which features low permeability and high compressive strength. However, concerns about the stability of the cement-bentonite slurry trench have been raised because an existing soil-bentonite wall will be in very close proximity to the alignment of the cement-bentonite slurry trench; and the shear strength of the existing soil bentonite backfill is considered to be low. Excessive …
Structural Response Of Frp Reinforced Concrete Softeyes For Tunnel Excavation, Fabio Matta, Antonio Nanni
Structural Response Of Frp Reinforced Concrete Softeyes For Tunnel Excavation, Fabio Matta, Antonio Nanni
International Conference on Case Histories in Geotechnical Engineering
The development of pultruded glass fiber reinforced polymer (GFRP) bars for internal reinforcement of concrete, together with dedicated limit-state design guidelines, has led to a recent breakthrough in the field of tunnel excavation. The use of GFRP bars in softeyes, which are openings of retaining walls to be penetrated by tunnel boring machines (TBMs) during excavation, is becoming mainstream. The low shear strength and brittleness compared to steel bars facilitate and expedite excavation, resulting in time and cost saving, as well as improved safety. Large-size (#10) GFRP bars are typically used as flexural reinforcement for the massive softeyes, often in …
Movements Induced By Tunneling With An Epb Machine In Over Consolidated Soils: Compans Monitoring Section Of Toulouse Subway Line B, Fabrice Emeriault, Richard Kastner, Emilie Vanoudheusden
Movements Induced By Tunneling With An Epb Machine In Over Consolidated Soils: Compans Monitoring Section Of Toulouse Subway Line B, Fabrice Emeriault, Richard Kastner, Emilie Vanoudheusden
International Conference on Case Histories in Geotechnical Engineering
A part of Toulouse’s underground line B has been excavated by a 7.8 meters diameter earth-pressure balance machine. A comprehensive monitoring section has been installed in the Compans garden at a point where the tunnel cover is 12.8-meter and is running through overconsolidated clayey molasses underlying a 6.8 meters layer of made ground and gravels. The monitoring devices give full information on the ground movements above the tunnel and on deformations of the tunnel lining. Vertical movements are measured by 5 multipoint borehole extensometers with automatic data acquisition (every 5 seconds when the TBM crosses the monitoring section). At the …
Support Of Rock Cuts At Washington-Dulles International Airport, J. Sturman, E. B. Rehwoldt, C. D. Martin
Support Of Rock Cuts At Washington-Dulles International Airport, J. Sturman, E. B. Rehwoldt, C. D. Martin
International Conference on Case Histories in Geotechnical Engineering
Expansions at the Washington-Dulles International Airport since 1999 have required extensive vertical, open-cut rock excavations in Triassic age siltstone bedrock. These excavations have extended to depths of up to approximately 65 ft (20 m) adjacent to existing infrastructure for construction of new below-ground stations for the new Automated People Mover (APM) light rail system. The selection of design support pressures for the rock excavations was an important decision, balancing the projects’ risks and construction costs. At the center of this issue was the development of a geotechnical model of the rock mass and its primary failure mechanism. Thus, a comprehensive …
Land Subsidence In Tehran District, Iran, Said Ghorbanbeigi, Jafar Naji Hamodi
Land Subsidence In Tehran District, Iran, Said Ghorbanbeigi, Jafar Naji Hamodi
International Conference on Case Histories in Geotechnical Engineering
Land subsidence is a worldwide phenomenon, where there is a sudden sinking or gradual downward settling of the earth's surface with little or no horizontal motion. In Iran, this phenomenon is noticed to take place in many areas among which are Meshhed, Kerman, Tehran, Hamedan and others. In some of the above areas, water well installations seem to rise into the air, or some times to produce fissures in the soil and/or showing sinkhole in carbonated rocks. Land subsidence could causes damages in surface and subsurface installations. UNISCO was concerning with this worldwide phenomenon and tried to study it in …
Comparison Between Stone Columns And Vertical Geodrains With Preloading Embankment Techniques, Mounir Bouassida, Lassaad Hazzar
Comparison Between Stone Columns And Vertical Geodrains With Preloading Embankment Techniques, Mounir Bouassida, Lassaad Hazzar
International Conference on Case Histories in Geotechnical Engineering
In the framework of “Radès-La Goulette“bridge project (Tunisia), this study focuses on the construction of embankments located in north Lake of Tunis. These embankments with averaged height of about 6 m are founded on highly compressible clayey sand and muddy sand layers. A soil improvement technique is then imposed, to overcome the lack of low bearing capacity and high pronounced settlements. Two solutions of soil improvement have been studied; the first one consists in vertical “Geodrains” drilled until 10 m depth associated with step by step construction of preloading embankment. The second technique is stone columns reinforcement up to 10 …
Performance Of Deep Mixing Improvement Of Alluvial Soft Soil, R. D. Verástegui Flores, W. F. Van Impe, P. Afschrift, W. Cromheeke
Performance Of Deep Mixing Improvement Of Alluvial Soft Soil, R. D. Verástegui Flores, W. F. Van Impe, P. Afschrift, W. Cromheeke
International Conference on Case Histories in Geotechnical Engineering
An extensive laboratory and in situ investigation has been carried out aiming at studying the performance of deep mixing (column) improvement of alluvial soft soil. The laboratory research was primarily focused on the choice of an appropriate binder and dosage for the in situ application. Different binders (e.g. portland cement, composite cement, and blast furnace cement) in combination with quicklime were used. The results of a series of Unconfined Compression (UC) tests showed that blast furnace cement performs rather well in terms of strength and stiffness. The experimentation in situ consisted of instrumentation of trial embankments built both on improved …
Review Of In Situ Measurements As Indications Of Liquefaction Potential At Numerous Sites, David Rees Gillette
Review Of In Situ Measurements As Indications Of Liquefaction Potential At Numerous Sites, David Rees Gillette
International Conference on Case Histories in Geotechnical Engineering
Current practice for assessing liquefaction potential of granular soils depends heavily on in situ indices of density, and sometimes direct measurements of density. Correlations have been developed to predict resistance to liquefaction as a function of standard penetration test (SPT) blow count, cone penetrometer (CPT) tip resistance, shear-wave velocity (VS), or other index property. Recognizing that each correlation entails its own uncertainties, and that different indices of liquefaction potential may provide conflicting conclusions, the Bureau of Reclamation reviewed in situ test results from a large number of sites where multiple tests had been used. The goals were to …
Seismic Characterisation Of Soils With Spt: Comparison Of Calculated Vs Values And Measured Vs Values, M. L. Rainone, P. Torrese, P. Signanini, F. Pizzica
Seismic Characterisation Of Soils With Spt: Comparison Of Calculated Vs Values And Measured Vs Values, M. L. Rainone, P. Torrese, P. Signanini, F. Pizzica
International Conference on Case Histories in Geotechnical Engineering
Italian seismic regulatory guidance (O.P.C.M. n. 3274 of 20 March 2003, O.P.C.M. n. 3519 of 28 April 2006, implemented within the “Norme Tecniche per le Costruzioni” – D.M. of 14 January 2008) which conforms to European guidance (Eurocode 8), advises a seismic classification of foundation soils through the Vs30 value or alternatively the Nspt value. Several correlations between the Nspt parameter and the Vs parameter are known in literature (Otha & Goto, 1978; Imai & Tonouchi, 1982; Ohsaki & Iwasaki, 1977; Seed, 1983). Each of these correlations can only be applied in certain geological-technical contexts. The validity of these …
Strengthening Of Clay Soils Of Buildings Bases Under Reconstruction By Means Of Alkalization, F. E. Volkov, L. N. Gera
Strengthening Of Clay Soils Of Buildings Bases Under Reconstruction By Means Of Alkalization, F. E. Volkov, L. N. Gera
International Conference on Case Histories in Geotechnical Engineering
The experience of use of natrium hydroxide solutions for strengthening of clay soils of buildings bases under reconstruction in city Ufa is described. The method applied allows to increase the design soil resistance from 0.16 to 0.4 MPa and decrease the labour expenditures at site by 40 %.
New I-95 Woodrow Wilson Bridge Foundations, Roderic A. Ellman Jr.
New I-95 Woodrow Wilson Bridge Foundations, Roderic A. Ellman Jr.
International Conference on Case Histories in Geotechnical Engineering
The new Woodrow Wilson Bridge (WWB) will replace the existing bridge over the Potomac River to connect Alexandria, Virginia to Prince Georges County, Maryland. The new WWB will extend approximately 1.1 miles across the river, with a 367-ft long bascule span in the main river channel where the water depth is about 36 ft. The bridge is primarily comprised of fixed spans in relatively shallow water and a bascule span over the navigation channel. The subsurface soil profile was quite variable along the bridge alignment. In Virginia there was fill over soft Alluvial deposits underlain by dense Terrace deposits, as …
Forensic On Construction Induced Failure Of Pipe Pile Foundations, Xiong Bill Yu, Yuewen Huang
Forensic On Construction Induced Failure Of Pipe Pile Foundations, Xiong Bill Yu, Yuewen Huang
International Conference on Case Histories in Geotechnical Engineering
This paper introduces a case where pipe piles failed during construction. The accident happened when constructing the Jiaoxi Pumping Station project in the southern China. The site consists of very soft sludge and silt deposits. Pipe piles were used as foundation under the station structure. The installed pipe piles were observed to show significant inclination during the construction. A forensic investigation was performed. The driving forces for pipe pile failure were attributed to the lateral load induced by the excavation activities. Small strain integrity test and inclination measurement were taken to determine the location of breakage and the extent of …
Geotechnical Risk Analysis Of The Local Flood Control Projects On The Kansas River In Topeka, Kansas, Mary Perlea, Scott Loehr
Geotechnical Risk Analysis Of The Local Flood Control Projects On The Kansas River In Topeka, Kansas, Mary Perlea, Scott Loehr
International Conference on Case Histories in Geotechnical Engineering
The paper presents the results of the geotechnical evaluation of the existing conditions of the local flood protection of Topeka, the state capital of Kansas. The existing levee system constructed by the U.S. Army Corps of Engineers consists of 6 levees units along the north and south bank of the Kansas River and tributaries, Soldier Creek and Shunganunga Creek. The geotechnical evaluation of the existing conditions of the levee system was based on all available geotechnical data and on the past performance of the system. The critical reaches of each levee unit were identified based on the geotechnical conditions and …
Design And Behavior Of Salgueiros Station For Porto Metro, António Topa Gomes, António Silva Cardoso, Jorge Almeida E Sousa, José Carlos Andrade, Carlos Augusto Campanhã
Design And Behavior Of Salgueiros Station For Porto Metro, António Topa Gomes, António Silva Cardoso, Jorge Almeida E Sousa, José Carlos Andrade, Carlos Augusto Campanhã
International Conference on Case Histories in Geotechnical Engineering
The paper presents the design and construction of an elliptical excavation for Porto Light Metro. Due to its original shape the solution took full advantage of the arch effect in the ground, adapting the Sequential Excavation Method to the vertical direction and achieving a novel, light and economic solution. In a first phase, the paper describes the construction method, referring also to economic and planning aspects of the excavation performed. The design is presented and discussed, including the presentation of the geotechnical tests performed and a brief analysis on the parameters assumed. The final part of the paper analyses monitoring …
Construction Of Mass Concrete Structure Utilizing Ground Settlement From Underpass Construction In The 2nd Phase Kansai International Airport Project, Masaru Fujimoto, Takechiho Tabata, Tsuyoshi Emura, Masato Nakamichi
Construction Of Mass Concrete Structure Utilizing Ground Settlement From Underpass Construction In The 2nd Phase Kansai International Airport Project, Masaru Fujimoto, Takechiho Tabata, Tsuyoshi Emura, Masato Nakamichi
International Conference on Case Histories in Geotechnical Engineering
The man-made island of Kansai International Airport is located 5 km offshore in Osaka bay and the water depth at the point is about 20 m. Thickness of the sediments beneath the island is several hundred meters, including 20 m of very soft Holocene clay layer. Huge amount of soil had been reclaimed layer over layer and the total thickness is up to 34 to 45 m. Therefore, large amount of settlement is inevitable and the average settlement forecast in the 2nd phase island over the 60 years period from the start of reclamation work is 18 m. In this …
Degradation Of Axial Shaft Capacity Of Piles In Soft Clay Due To Cyclic Loading, Paul Doherty, Kenneth Gavin
Degradation Of Axial Shaft Capacity Of Piles In Soft Clay Due To Cyclic Loading, Paul Doherty, Kenneth Gavin
International Conference on Case Histories in Geotechnical Engineering
This paper presents details of the installation and axial compressive cyclic load tests performed on the UCD 76mm diameter highly instrumented steel pile at a soft clay test site in Belfast. Lateral stress measurements and pore pressures are obtained through pressure transducers mounted diametrically opposite each other in the pile wall at three levels. The pore pressures during installation are seen to drop off as pile-slip occurs for a given jacking stroke before rising to higher ultimate values, resulting in a brittle load response. Following an equalisation period two cyclic load tests were performed, where the loads were applied from …
Application Of Case Studies In Education: Panel Presentation For Session 11, Friday, Aug 15, Peter Scharle
Application Of Case Studies In Education: Panel Presentation For Session 11, Friday, Aug 15, Peter Scharle
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Case Histories Oriented Teaching Of Geotechnical Engineering, Sukhmander Singh
Case Histories Oriented Teaching Of Geotechnical Engineering, Sukhmander Singh
International Conference on Case Histories in Geotechnical Engineering
Integration of theory and practice in the teaching of geotechnical engineering have been examined on the basis of several years of teaching of foundation engineering. Most geotechnical analyses and relationships for use in design are developed under idealized boundry conditions. It has been shown by the use of case studies that an understanding of the departure between the idealized and the real boundry conditions is essential for the practice of geotechnical engineering. The case studies have also been used to teach students that the success of a geotechnical engineer depends upon how well he/she bridges the gap (departure) between the …
Josef Exploration Drift – From Exploration Of Gold To Unique Facility For Geotechnical Research, Education And Training, Jiri Slovak, Jiri Svoboda, Radek Vasicek, Pavla Bauerova
Josef Exploration Drift – From Exploration Of Gold To Unique Facility For Geotechnical Research, Education And Training, Jiri Slovak, Jiri Svoboda, Radek Vasicek, Pavla Bauerova
International Conference on Case Histories in Geotechnical Engineering
The Josef exploration drift was established in the 1980s for the underground exploration of gold deposits, the largest gold deposits in Central Europe. From 2005 to the beginning of 2007 the drift was transformed into an educational and research facility. The Josef Underground Educational Facility is intended to be a multidisciplinary workplace. Its main use c
Monitoring Seismic And Geophysical Paprameters With The Help Of College Instruments And Staff, Arun Bapat
Monitoring Seismic And Geophysical Paprameters With The Help Of College Instruments And Staff, Arun Bapat
International Conference on Case Histories in Geotechnical Engineering
A number of geophysical and seismically significantly related parameters are routinely measured in college laboratories. These are Magnetic field, Gravity field, Radioactivity, sub-surface temperature. After one major earthquake in India (M = 6.5, Latur earthquake of 29 September 1993) some colleges were used to measure these parameters. These parameters show premonitory changes prior to the occurrence of main shock. As the experiment was undertaken during post-seismic period the magnitudes of the seismic events were in the range of 4.5 to 5.0. The advantage of such method is that these are extended over an extensive area.
Soil Sampling At Sword Beach – Luc-Sur-Mer, France, 1943: How Geotechnical Engineering Influenced The D-Day Invasion And Directed The Course Of Modern History, William D. Lawson
Soil Sampling At Sword Beach – Luc-Sur-Mer, France, 1943: How Geotechnical Engineering Influenced The D-Day Invasion And Directed The Course Of Modern History, William D. Lawson
International Conference on Case Histories in Geotechnical Engineering
This paper presents an historical account of covert soil sampling operations conducted by the British Royal Navy’s No. 1 Combined Operations Pilotage and Beach Reconnaissance Party on December 31, 1943, near Luc-sur-Mer, France at the beach later given the codename “Sword.” With the tactical goal of determining whether the beach sand would support heavy invasion craft such as tanks, trucks, and bulldozers, this commando-style mission provided the field data by which the Supreme Allied Command established the site for the main landing beaches where the initial assault phase of Operation Overlord, the Allied invasion of Normandy, took place on June …
Emerging Innovative Solutions Enhancing Practical Geotechnical Engineering, Shubhada S. Jagtap, Annapurni Iyer, Minimol Korulla
Emerging Innovative Solutions Enhancing Practical Geotechnical Engineering, Shubhada S. Jagtap, Annapurni Iyer, Minimol Korulla
International Conference on Case Histories in Geotechnical Engineering
This paper presents two case histories, wherein double twisted hexagonal wire mesh crates and netting were used as a solution for geotechnical problems that aroused while execution. One of which is worldwide known and one of the most prestigious projects of India - Konkan Railway, and second is internationally noted tourist spot- Amby Valley Sahara lake city. In Konkan Railway project, double twisted wire mesh was used as a basic material for variety of problems like rock fall prevention, Gravity walls at the base of rock slopes, Baby Gabions as ballast retention for railway tracks, Platform Gabions etc. Adoption of …
Foundations Of The Nation: The Hillbrow And Brixton Towers As Figurations Of National Identity In South Africa, Lizè Groenewald, Francis Legge
Foundations Of The Nation: The Hillbrow And Brixton Towers As Figurations Of National Identity In South Africa, Lizè Groenewald, Francis Legge
International Conference on Case Histories in Geotechnical Engineering
In its accreditation of degrees, the Engineering Council of South Africa (ECSA) requires the inclusion, in any curriculum, of 10% of total credits of what are termed complementary studies that encompass reflections upon environmental impact, legal matters, cultural heritage and design philosophies as they pertain to the engineering profession. By stipulating this inclusion ECSA acknowledges that engineering can no longer be regarded as a neutral, apolitical endeavour. This paper responds to the latter position and sets out to offer a broadening of the current scope of scholarly dialogue between a logical science and the human community which it serves. In …
Geobrain: Dutch Feasibility Database For Installing Sheet Pile Walls, A. R. (André) Koelewijn, A. M. J. (Annemieke) Mens
Geobrain: Dutch Feasibility Database For Installing Sheet Pile Walls, A. R. (André) Koelewijn, A. M. J. (Annemieke) Mens
International Conference on Case Histories in Geotechnical Engineering
In this paper it is shown how the knowledge embedded in case histories can be used to explicate some of the uncertainties contributing to the gap between theory and practice. With the help of computational intelligence techniques, collections of case histories in data-bases, as a type of collective memory of the geotechnical profession may be explored to turn this memory into collective brains in geo-technics: a GeoBrain. Regarding the scarcity of soil investigation data and the translation of the available data into a model, the ‘schematization factor’ has been introduced as a partial safety factor to account for the influence …