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Articles 10441 - 10470 of 21775
Full-Text Articles in Engineering
Ancient Landslide Reactivation At The Viaduct No. 1 Located On The Caraca-La-Guaira Highway In Venezuela, Luis B. Fargier-Gabaldón, Daniel A. Salcedo, Rosendo Camargo-Mora
Ancient Landslide Reactivation At The Viaduct No. 1 Located On The Caraca-La-Guaira Highway In Venezuela, Luis B. Fargier-Gabaldón, Daniel A. Salcedo, Rosendo Camargo-Mora
International Conference on Case Histories in Geotechnical Engineering
Reactivation of an ancient landslide detected in 1987 affected the southern side of the Viaduct No.1 located in the Caracas-La Guaira highway, which connects Caracas, capital of Venezuela, with its main seaport and the Simon Bolivar International Airport. The Viaduct was built in 1953 and covered a gorge of approximately 300 m. It consisted of three parallel double-hinged arch ribs made of plain concrete spanning over approximately 152 m and two smaller access Viaducts on either side of the arch rib span. This paper summarizes the results from geotechnical investigation, the evaluation of inclinometers readings and surface control points and …
Deterioration Of Bored Cast In Situ Piles Due To Aggressive Water, V. T. Ganpule, S. Y. Mhaiskar
Deterioration Of Bored Cast In Situ Piles Due To Aggressive Water, V. T. Ganpule, S. Y. Mhaiskar
International Conference on Case Histories in Geotechnical Engineering
Most of the data available from the cement industry and the literature exhibits performance of concrete cubes cured in normal water. Even the literature related to the durability of concrete deals mostly with concrete cured in normal water (closer to potable water in characteristics). However, the bored-cast-in-situ piles are cured in the ground water. The development of strength of concrete of bored cast-in-situ piles depends upon the quality of ground water. The effect of sulphates and chloride is well established and most of the codes stipulate permissible limits of pH, sulphates and chlorides contents in the ground water. In the …
Soil And Structure Vibrations From Construction And Industrial Sources, Mark R. Svinkin
Soil And Structure Vibrations From Construction And Industrial Sources, Mark R. Svinkin
International Conference on Case Histories in Geotechnical Engineering
Construction and industrial dynamic sources can produce environmental vibration problems for adjacent and remote structures. High vibrations and unacceptable dynamic settlements could disturb sensitive devices and people and even be the cause of structural damage. The dynamic sources, the geology at a site, and the condition of structures affect ground and structure vibrations. Each construction or industrial site is unique and requires consideration of specific approaches at the site for decreasing vibration effects of construction activities or industrial dynamic sources on surrounding structures. Specifications prepared for a site, calculation and prediction of expected vibrations, and monitoring and control of ground …
Symposium - James K. Mitchell, Multiple Authors
Symposium - James K. Mitchell, Multiple Authors
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Performance Of Deep Soil Nailed Walls, H. Turan Durgunoğlu
Performance Of Deep Soil Nailed Walls, H. Turan Durgunoğlu
International Conference on Case Histories in Geotechnical Engineering
Exactly 40 years ago, one sunny September day, I found myself at the secretarial office of Geotechnical Engineering at UC Berkeley. I was very excited because it was going to be the first meeting with my advisor, Professor James K. Mitchell. Although I had previously received a very warm welcome letter from Professor Mitchell, I was convinced the meeting would be a very different experience for a foreign student from Turkey. Upon entering his office, and receiving a warm welcome, my assignment as a Research Assistant at the Richmond Field Station was explained to me and my schedule of classes …
A Historical Perspective On Geotechnical Case Histories Courses, J. David Rogers
A Historical Perspective On Geotechnical Case Histories Courses, J. David Rogers
International Conference on Case Histories in Geotechnical Engineering
Ralph Peck introduced the concept of using a geotechnical case histories course to teach students problem solving and technical communications skills, beginning around 1956. This course was developed as a professional practice course at the graduate level, intended for civil engineers of diverse backgrounds as well as geoscientists. Students were required to prepare one-page summaries of each case history profiled in the course, a requirement that left an enormous impression on the students. A different approach was employed by the University of California, Berkeley, beginning around 1970. Berkeley offered two graduate courses in the mold of ABET “capstone courses,” graduate …
Case Studies In Forensic Geotechnical And Foundation Engineering, D. S. "Sax" Saxena
Case Studies In Forensic Geotechnical And Foundation Engineering, D. S. "Sax" Saxena
International Conference on Case Histories in Geotechnical Engineering
Forensics in the geo-domain encompasses an extensive array of topics with specific emphasis in geotechnical related fields. A new discipline known as forensic geotechnical engineering (FGE) has been created to deal with investigations of soil-interaction related failures of engineered facilities or structures. A practicing geotechnical engineer cannot provide services without the fear of a lawsuit. Services of geotechnical engineers experienced in jurisprudence system are commissioned to investigate such failures. This paper presents two case histories where forensic geotechnical engineering was effectively utilized to identify, investigate, and remediate the problem as well assist in litigation. The first case history identifies a …
Influence Of Taper In Selecting Pile Support System Or Major Structures, Walter G. Brusey, Robert Yin
Influence Of Taper In Selecting Pile Support System Or Major Structures, Walter G. Brusey, Robert Yin
International Conference on Case Histories in Geotechnical Engineering
Tapered steel piles have been used predominantly at JFKIA to provide foundation support for selected structures including “International and Domestic Air Terminals” plus heavily loaded multi-level “Parking Garages”, JFK Airtrain Elevated Guideway, JFK Terminal at Jamaica, Queens, NYC and other facilities. The historical development and comparative evaluation of tapered piles with other pile types are addressed. Results of dynamic measurements to permit evaluation of pile capacity during initial installation and at predetermined subsequent intervals to evaluate set-up (increased capacity with time) are provided. Final selected ultimate pile capacities are always confirmed by standard compression load tests illustrated by an extensive …
General Report — Session 7: Soil Property Improvement And Environmental Contamination, José L. M. Clemente, Mounir Bouassida, Dhananjay L. Shah, Muawia A. Dafallia
General Report — Session 7: Soil Property Improvement And Environmental Contamination, José L. M. Clemente, Mounir Bouassida, Dhananjay L. Shah, Muawia A. Dafallia
International Conference on Case Histories in Geotechnical Engineering
No abstract provided.
Experimental And Numerical Analysis Of The Behaviour Of An Embankment Stabilized With Vertical Drains, Francesco Castelli, Valentina Lentini, Michele Maugeri
Experimental And Numerical Analysis Of The Behaviour Of An Embankment Stabilized With Vertical Drains, Francesco Castelli, Valentina Lentini, Michele Maugeri
International Conference on Case Histories in Geotechnical Engineering
The paper deals with the settlement analysis of an embankment founded on soft soil and realized for the construction of a reinforced concrete building in the industrial area of Catania (Sicily, Italy). The solution adopted consisted in the construction of the embankment by stages with thirty-three vertical prefabricated drains disposed under the embankment. Soil consolidation settlements took place since the beginning of the embankment construction. The experimental measurements were carried out since August 2000 up to January 2001. The site was well investigated by means of in-situ and laboratory tests. A significantly correspondence between the values of the geotechnical parameters …
Lessons Learned From The Performance Of A Degradable Shale Embankment: Case Study, Sebastian Lobo-Guerrero, Neal W. Fannin, James G. Ulinski, Suresh Gutta
Lessons Learned From The Performance Of A Degradable Shale Embankment: Case Study, Sebastian Lobo-Guerrero, Neal W. Fannin, James G. Ulinski, Suresh Gutta
International Conference on Case Histories in Geotechnical Engineering
Degradable shales are sedimentary rocks with properties that can vary from those of solid rock to soil like materials if subjected to wetting and drying cycles. If the potential for degradation of the shale is not identified on time, rock like particles could be used as strong embankment material. After wetting and drying cycles, degradation occurs and the initial large voids formed between the generally uniform rock particles are filled with smaller fragments, resulting in significant settlements and slope instability. This paper present a case study of a 40 foot (12.2m) approach embankment having 1.5H:1V slopes that was unintentionally constructed …
Predicted Versus Observed Failure Surface: A Case Study, P. K. Basudhar, G. Bhattacharya
Predicted Versus Observed Failure Surface: A Case Study, P. K. Basudhar, G. Bhattacharya
International Conference on Case Histories in Geotechnical Engineering
The paper pertains to the studies undertaken to investigate the efficacy and correctness of a numerical scheme developed by the authors to predict the stability of slopes. As such, a well documented failed test embankment has been reanalyzed using the suggested method for predicting the critical slip surface and the associated factor of safety. A comparison of the predicted failure surface (critical slip surface) with the observed failure surface showed close agreement; the corresponding value of factor of safety was found to be close to unity. Thus, the case study demonstrated that with appropriate choice of the strength parameters the …
Shear Wave-Velocity Investigation Of Soil Liquefaction Sites From The Tangshan, China M7.8 Earthquake Of 1976 Using Active And Passive Surface Wave Methods, Robert Kayen, Xiaxin Tao, Lijing Shi, Hailiang Shi
Shear Wave-Velocity Investigation Of Soil Liquefaction Sites From The Tangshan, China M7.8 Earthquake Of 1976 Using Active And Passive Surface Wave Methods, Robert Kayen, Xiaxin Tao, Lijing Shi, Hailiang Shi
International Conference on Case Histories in Geotechnical Engineering
An initial investigation of soil liquefaction sites from the July, 28 1976 Tangshan M7.8 earthquake was conducted between 1976 and 1978 by the National Ministry of Railways, China. These data are the basis of the ‘Chinese Method’ for assessment of liquefaction potential of silty-sand deposits, and are an important component of the worldwide data set for modern probabilistic methods for assessment of soil liquefaction using Bayesian updating and system reliability tools. We revisited 26 sites identified in the maps and published 198 report of the Ministry of Railways in order to investigate these locations with a suite of active- and …
Back Analysis Of A Deep Excavation In Soft Lacustrine Clays, Patrick Becker, Berhane Gebreselassie, Hans-Georg Kempfert
Back Analysis Of A Deep Excavation In Soft Lacustrine Clays, Patrick Becker, Berhane Gebreselassie, Hans-Georg Kempfert
International Conference on Case Histories in Geotechnical Engineering
Up to 9.9 m deep excavation was executed in 2002 for the LAGO Shopping Center in Constance city near the lake Bodensee (Constance lake) located north of the German alps. The excavation was 100 m long and 50 to 100 m wide and carried out in two parts. Part I of the excavation includes two basement floors and part II one basement floor. The underground condition in city Constance and the surroundings is known of a deep and soft deposit of lacustrine clay. To reduce deformations due to excavation, the part I was again partitioned in three longitudinal strips by …
Case History — Settlement Mitigation For Mat Foundation Using Lean Concrete Columns, Franklin Fong, Chad M. Davis
Case History — Settlement Mitigation For Mat Foundation Using Lean Concrete Columns, Franklin Fong, Chad M. Davis
International Conference on Case Histories in Geotechnical Engineering
This paper presents a case history of Lean Concrete Column (LCC) design, prediction, installation, and monitoring for a 34-story high-rise condominium tower over a five-level underground parking substructure supported on a mat foundation in San Diego, California. The site constraints and the building configuration imposed unusual design and construction challenges, which resulted in high foundation pressures and eccentric loading for the planned building mat foundation. A geotechnical investigation consisting of deep test borings, Cone Penetrometer Tests (CPT), and laboratory tests indicated that formational soils underlying the site did not provide the necessary bearing capacity to directly support the structure on …
Case Study Of A Water Tank Behaviour On An Improved Collapsible Soil, A. Stanciu, N. Boti, L. Lungu, O. Donciu
Case Study Of A Water Tank Behaviour On An Improved Collapsible Soil, A. Stanciu, N. Boti, L. Lungu, O. Donciu
International Conference on Case Histories in Geotechnical Engineering
The geotechnical report performed for the design stage of a water tank revealed a soil profile consisting in a thick layer of collapsible/loessial soil. The paper firstly presents the complex characterization of the natural ground conditions before and after the soil cushion performance, during the water filling tests of the tank. Specific charts are presented to emphasize the physical and mechanical parameter differences of the natural and improved ground by the soil cushion. The prediction of the supplementary settlement profile on the construction site of the water tank has been performed due to a significant water leakage from the tank …
Investigating Failure Of A Geosynthetic-Reinforced Soil Wall In Black Hawk, Colorado, Jonathan T. H. Wu, Kanop Ketchart
Investigating Failure Of A Geosynthetic-Reinforced Soil Wall In Black Hawk, Colorado, Jonathan T. H. Wu, Kanop Ketchart
International Conference on Case Histories in Geotechnical Engineering
Approximately 18 months after construction, an 11-m high rock faced Geosynthetic-Reinforced Soil (GRS) wall was found to suffer from subsidence of about 100 mm on the crest, along with rocks being dislodged from the wall face from time to time. In the ensuing three months after these signs of problems were first detected, the subsidence on the crest of the wall increased to about 250 mm with significant lateral bulging on the wall face. The wall comprised two sides. The problems occurred primarily on one side of the wall; while the other side showed little distress. The entire wall eventually …
Foundations On Expansive Soils In Mexico, Enrique Padilla-Corona
Foundations On Expansive Soils In Mexico, Enrique Padilla-Corona
International Conference on Case Histories in Geotechnical Engineering
Mexico has a considerable number of regions covered by expansive soils (12% of the total country area). One of these regions, named as “Cienega de Chapala”, is located in the state of Jalisco; the morphology of this region is mostly volcanic where plains and basins are found among volcanic formations. Plains and basins contain a variety of rocks mixed with volcanic ashes. The soil is formed by alluvial and lacustrine lands arranged in layers where the expansivity of superficial layers range from medium to high. This work describes two cases to illustrate typical problems originated by subsoil displacements. These displacements …
Some Interesting Results About Behaviour Of Granular Media, Francesco Di Credico, P. Signanini, P. Torrese
Some Interesting Results About Behaviour Of Granular Media, Francesco Di Credico, P. Signanini, P. Torrese
International Conference on Case Histories in Geotechnical Engineering
This study represents an attempt to clarify some anomalous behaviour found in alluvional terrains when subjected to an earthquake. Our approach to the study of granular media has been bibliographic and experimental. Despite many studies carried on this topic, this behaviour is still little understood because of the complex nature of granular media. The goal to the experimental research was at least to confirm the „anomalous“ behaviour reported in previous studies (e.g., chain of force, not-uniform distribution of pressure, etc.). In particular, this study is focused on pressure distributions and their quantification with respect to the pure granular media, and …
Excavation Support For The Newseum Development At 555 Pennsylvania Avenue In Washington Dc, Usa, Victor Omelchenko, Mamoud Hosseini
Excavation Support For The Newseum Development At 555 Pennsylvania Avenue In Washington Dc, Usa, Victor Omelchenko, Mamoud Hosseini
International Conference on Case Histories in Geotechnical Engineering
The Newseum consists of a 650,000 square-foot development that includes a six-level, 215,000 square-foot interactive museum of news. Also included is office space for the Newseum and Freedom Forum staff, a 9,000 square-foot conference center, more than 30,000 square feet of retail space and approximately 100 condominiums. The Newseum is located on Pennsylvania Avenue, between the U.S. Capital and the White House next to the Washington, D.C. mall and its museums and monuments. The building is supported on a mat foundation. The project is located just north of the Old Tiber Creek that was filled in the early 1800’s. Soft …
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 …
Behavior Of An Excavation Adjacent To A Historical Building And Metro Tunnels In Shanghai Soft Clays, J. Jia, J. H. Wang, C. P. Liu, L. L. Zhang, X. L. Xie
Behavior Of An Excavation Adjacent To A Historical Building And Metro Tunnels In Shanghai Soft Clays, J. Jia, J. H. Wang, C. P. Liu, L. L. Zhang, X. L. Xie
International Conference on Case Histories in Geotechnical Engineering
In this paper, a case history of a deep excavation in Shanghai, which was adjacent to a historical building founded on 27 m long wooden piles and operating Metro tunnels, is presented. The effects of the excavation on the nearby pile foundation and the existing tunnels are investigated using two-dimensional finite element modeling. The predicted maximum horizontal and vertical displacements of the wooden piles are 15.8 mm and 7.6 mm, respectively. The horizontal and vertical movements of the utility tunnel and Metro tunnel are all less than 10 mm, which satisfies the current design criteria for controlling the deformation of …
Effect Of High In-Situ Stress On Braced Excavations, Wolfgang Roth, Bei Su, Jake Vanbaarsel, Eric Lindquist
Effect Of High In-Situ Stress On Braced Excavations, Wolfgang Roth, Bei Su, Jake Vanbaarsel, Eric Lindquist
International Conference on Case Histories in Geotechnical Engineering
The two underground stations and portals of Metro Gold Line's East Los Angeles extension were excavated in heavily over-consolidated alluvium. The excavations were supported with heavy soldier piles with pre-loaded steel-pipe struts. When measured strut loads increased to up to 3 times the design value, and strut-waler connections began to buckle, the contractor was directed to install additional struts. Maintaining that the problem had been caused by inadequate construction means and methods, the owner denied a change-order request for this work. This paper describes the contractor’s investigation into the cause of strut overloading in preparation for a formal hearing by …
Harmony Of Retaining Systems To Various Local Subsoil Conditions – A Case Study, H. Bora Keskin, H. Turan Durgunoglu, Selim Ikiz
Harmony Of Retaining Systems To Various Local Subsoil Conditions – A Case Study, H. Bora Keskin, H. Turan Durgunoglu, Selim Ikiz
International Conference on Case Histories in Geotechnical Engineering
A case study for the utilization of various retaining systems for different subsoil and groundwater conditions encountered within a given site is presented in this paper. The project is known as “BJK Fulya Complex”, covering approximately 160,000 m2 floor area. It is located at a very prestigious district of the city, therefore maximum underground space gain were desired. As a result nearly 20 m of excavation is planned to be performed partly under groundwater. Due to unique topography and geology of the site, subsoil and groundwater conditions at various faces of the excavation differ considerably. Because of the complicated …
Lessons Learned From Two Investigation Cases Of Ground Distresses Due To Deep Excavation In Filled Ground, Liew Shaw-Shong, Khoo Chee-Min
Lessons Learned From Two Investigation Cases Of Ground Distresses Due To Deep Excavation In Filled Ground, Liew Shaw-Shong, Khoo Chee-Min
International Conference on Case Histories in Geotechnical Engineering
Ground distresses such as ground settlement/subsidence, lateral movement, cracking, etc, are usually the main concern for any excavation project. The contributory factors of ground distresses could be from various aspects and sometimes are similar in nature. This paper presents the processes of geotechnical investigation, remedial design, construction monitoring for two case histories of ground distresses occurring on a retained platform due to excavation in filled ground. Desk study, site inspection and subsurface exploration have been deployed to reveal the evidences and identify probable causes of the distresses. Back analyses utilizing finite element computer program “Plaxis” proved useful to reveal the …
Stabilization Of Gantry Column Foundation By Soil Nailing, Meenal Gosavi, Satyendra Mittal, Swami Saran
Stabilization Of Gantry Column Foundation By Soil Nailing, Meenal Gosavi, Satyendra Mittal, Swami Saran
International Conference on Case Histories in Geotechnical Engineering
Soil nailing can be used for retaining both temporary and permanent excavations. One of the successful applications of this technique includes the Singapore expressway project (Raju, 1996). As a part of this research work, one project of soil nailing has been completed in M/s Hero Cycles Industries, Ludhiana, India, where nailing has been used for stabilization of steel columns footings, meant for electrically operated gantry crane. Construction details and numerical analysis of nailed cut is described in this paper. KEYWORDS: Driven nails, foundation stabilization, nailed cut, pull-out tests, shotcreting.
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 …
The Selection Of An Earth Retention System At The Boston's Central Artery/Tunnel Project, Shahriyar Mojahed, Mark French
The Selection Of An Earth Retention System At The Boston's Central Artery/Tunnel Project, Shahriyar Mojahed, Mark French
International Conference on Case Histories in Geotechnical Engineering
The Central Artery/Tunnel (CA/T) Project also known as "Big Dig" has been the largest public work ever attempted in the American history. The selection of an appropriate earth retaining system for elimination of ground movement and preservation of adjacent structures was a key constructability challenge for construction practitioners at the CA/T. This paper explains the critical factors which had an effect on the selection of the Soldier Pile-Tremie Concrete (SPTC) slurry walls at the project. The advantageous of this system has been illustrated for other projects that face similar challenging conditions.
Case History Compilation Of Engineering Properties Of Common Rocks In Maharashtra, India, For Database (1982-2002), M. S. Mundhe, V. B. Pandhare, N. M. Methekar, Shriram R. Vaijapurkar
Case History Compilation Of Engineering Properties Of Common Rocks In Maharashtra, India, For Database (1982-2002), M. S. Mundhe, V. B. Pandhare, N. M. Methekar, Shriram R. Vaijapurkar
International Conference on Case Histories in Geotechnical Engineering
Rock samples are received from various project sites for testing at MERI. These rock samples were tested and test results were communicated to the project in charge from time to time. After carrying out tests to determine different engineering properties of various types of commonly available rocks, mostly for irrigation structures in Maharashtra, lot of historical data is available. It was felt that, this data of results may be compiled digitally in database software (M. S. Access) and analyzed suitably for use in design and construction of irrigation and other important structures in future. The results of about 1920 Rock …
Case History Of Tunnelling Through Claystone, R. K. Goel, Anil Swarup
Case History Of Tunnelling Through Claystone, R. K. Goel, Anil Swarup
International Conference on Case Histories in Geotechnical Engineering
A broad gauge railway line is being constructed by Indian Railways in Himalaya. The total route length is 342kms, out of which about 100km is in tunnels. The tunnelling problem while excavating the Tunnel no.1 of Udhampur-Katra section and being faced currently is discussed in the paper. The D-shaped tunnel passes through thickly bedded, moderately soft, sparsely jointed sandstone, sheared claystones, siltstones and overburden comprising boulders/pebbles in sandy/silty matrix. The support pressure and the deformation were monitored to study the performance of the support system. Due to the presence of swelling minerals in claystone and weak & highly jointed rock …