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Articles 1981 - 2010 of 7869

Full-Text Articles in Civil and Environmental Engineering

Dynamic Properties Of Municipal Solid Waste In A Bioreactor Cell At Orchard Hills Landfill, Illinois, Usa, Philip J. Carpenter, Krishna R. Reddy, Michael D. Thompson Apr 2013

Dynamic Properties Of Municipal Solid Waste In A Bioreactor Cell At Orchard Hills Landfill, Illinois, Usa, Philip J. Carpenter, Krishna R. Reddy, Michael D. Thompson

International Conference on Case Histories in Geotechnical Engineering

Bioreactor landfills enhance municipal solid waste (MSW) degradation through recirculation of leachate inside the waste mass. In-situ monitoring of moisture distribution and changes in mechanical properties (stiffness) of MSW is needed to optimize the safe and effective operation of bioreactor landfills. Geophysical methods, such as electrical resistivity tomography, are shown to have great potential to monitor the moisture distribution. This study is aimed at investigating seismic surveys to characterize changes in dynamic properties (e.g., shear wave velocity and Poisson’s ratio) of MSW to infer the extent of degradation and provide the input needed for seismic stability evaluation. To achieve this …

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Evaluation Of Strength Of Clayey Soil By Ucs Test With Addition Of Rice Husk Ash And Lime, Tapash Kumar Roy Apr 2013

Evaluation Of Strength Of Clayey Soil By Ucs Test With Addition Of Rice Husk Ash And Lime, Tapash Kumar Roy

International Conference on Case Histories in Geotechnical Engineering

The present study investigates the benefits of using rice husk ash (RHA) with clayey soil as the subgrade material in flexible pavements with addition of small amount of lime. Four ratios of RHA of 5%, 10%, 15% and 20% mixed with the clayey soil by weight of soil sample. Further for getting the better performance, lime has been added in this study in the varying proportions from 1% to 3% by weight of soil. The compaction characteristics and unconfined compressive strength tests were conducted on these different mixed soils. The test results shows that the rice husk ash can be …

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Foundations Conditions Study For Aeolian Power Units On Soft Soils Under Static And Seismic Loads. Case Study, Anton Chirica, Dragos Vintila, Diana Tenea Apr 2013

Foundations Conditions Study For Aeolian Power Units On Soft Soils Under Static And Seismic Loads. Case Study, Anton Chirica, Dragos Vintila, Diana Tenea

International Conference on Case Histories in Geotechnical Engineering

The paper presents the analysis of foundations conditions under static and seismic loads for a wind farm located in the Eastern part of Romania. From lithological point of view, the location is characterized by a soft cohesive strata alternation over 40m deep. Some design considerations for obtaining the most economical foundation options are discussed. By taking into account the static and seismic conditions, the soil – structure interaction (S.S.I.) is also revealed together with conclusions on the aeolian towers’ foundations solutions.

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Response Of Piles Under A Combination Of Axial Static Loads And Lateral Harmonic Vibrations, Ahmad Dehghanpoor Apr 2013

Response Of Piles Under A Combination Of Axial Static Loads And Lateral Harmonic Vibrations, Ahmad Dehghanpoor

International Conference on Case Histories in Geotechnical Engineering

This paper presents a new mathematical method for analysis of piles under a combination of static and dynamic loads. In this study has been used the SSM (segment by segment method), which is verified using existing numerical and analytical solutions, is more efficient than the equivalent numerical solutions for example finite eminent methods. This method is useable inhomogeniouse soils. The characteristic effects of surrounding soil on the pile response are determined using stiffness and damping parameters of the soil - pile system. These effects can be taken into account if a proper soil reaction is employed. The soil reaction on …

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Sedimentation Behavior Of Fly Ash-Kaolinite Mixtures, Xin Kang, Xiaoyi Zhao, Bate Bate Apr 2013

Sedimentation Behavior Of Fly Ash-Kaolinite Mixtures, Xin Kang, Xiaoyi Zhao, Bate Bate

International Conference on Case Histories in Geotechnical Engineering

The sedimentation behavior of fine grained soil is largely dependent on its pore fluid chemistry. Different ionic concentration will lead to different fabrics of soil suspension, such as dispersion, aggregation, and flocculation. The ionic concentration also influences the thickness of the Diffuse Double Layer (DDL), which leads to the change in the final sediment volumes. Besides the ionic concentration influence, adding different amount of fly ash (FA) can also cause different sedimentation behaviors. The objective of this research was to quantify the interaction between fly ash and fine grained soils by comparing the influence of ionic concentration with that of …

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Seismic Bearing Capacity Of Strip Footing Resting On Reinforced Earth Bed, Apoorva Agarwal, Swami Saran, S. Mukerjee Apr 2013

Seismic Bearing Capacity Of Strip Footing Resting On Reinforced Earth Bed, Apoorva Agarwal, Swami Saran, S. Mukerjee

International Conference on Case Histories in Geotechnical Engineering

With an increase in demand for construction the use of poor soils becomes imperative. Soil bearing capacity and settlement play an important role in the design of foundations. Seismicity of the site is another important parameter in the design of the foundation for a structure. Hence seismic bearing capacity of soil becomes an important component in the design. In weak soils often deep foundations are recommended on account of the low soil bearing capacity available. In poor soils, ground improvement techniques are commonly used to improve the soil bearing capacity. Reinforcing earth with geo synthetic is one such technique adopted …

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Soil Liquefaction Analysis Based On Geotechnical Exploration And In Situ Test Data In The Tabriz Metro Line 2, Mikail Yousefzadeh Fard, Mahyar Babazadeh, Pouya Yousefzadeh Apr 2013

Soil Liquefaction Analysis Based On Geotechnical Exploration And In Situ Test Data In The Tabriz Metro Line 2, Mikail Yousefzadeh Fard, Mahyar Babazadeh, Pouya Yousefzadeh

International Conference on Case Histories in Geotechnical Engineering

Liquefaction is one of the most important and complex topics in geotechnical earthquake engineering. During this phenomenon, pore water pressure increases as long as it will be equal to confining stresses. Hence, the effective confining stress becomes zero and the soil will not have any shear resistance. As a result the soil mass is unstable and causes much destruction. In this research, according to information from boreholes of Tabriz Urban Train Line 2 all required parameters including total stresses, pore water pressures and effective stresses, the results according to soil type and water depth for all 53 preliminary boreholes were …

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Stabilization And Reinforcement Of Slope With Geogrid: A Case Study, Khashayar Hemmati, Seyed Vahid Masoomi, Javad Nazari Afshar Apr 2013

Stabilization And Reinforcement Of Slope With Geogrid: A Case Study, Khashayar Hemmati, Seyed Vahid Masoomi, Javad Nazari Afshar

International Conference on Case Histories in Geotechnical Engineering

This paper presents a case study example of appropriate method selection of stabilization and reinforcement of slope by introducing engineering and economical aspects. Introduced slope is located in science and research campus of Islamic Azad University (IAU) in north of Tehran with height of 4-29 m and length of 370 m. A big building with 9 floors and total area of 70000 square meters is located upper and near edge of slope, so that existence of this building has increased sensitivity of projects design and construction method. Slope is located in vulnerable area with a high risk of seismicity based …

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Static And Cyclic Triaxial Testing Of A Compacted Limestone Rockfill, Hamid Fallah Apr 2013

Static And Cyclic Triaxial Testing Of A Compacted Limestone Rockfill, Hamid Fallah

International Conference on Case Histories in Geotechnical Engineering

The results of large scale static and cyclic triaxial tests for the Siah Bishe rockfill are presented. The test specimens are made of a modeled gradation with Dmax of 5 cm, reduced from the real Dmax of 80 cm by scalping method. Static triaxial tests resulted in the rockfill shear strength parameters within the expected range. The cyclic triaxial strength tests showed that the dam body rockfill failure criterion is not affected by earthquake loading. On the other hand, the cyclic triaxial parametric tests results were used to define shear modulus and damping curves of the compacted rockfill, …

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Study Of Extent Of Soil Improvement By Employing Vibro-Compaction Technique, Tejas Belani, Shailendra Nagrikar, Deepak Raj Apr 2013

Study Of Extent Of Soil Improvement By Employing Vibro-Compaction Technique, Tejas Belani, Shailendra Nagrikar, Deepak Raj

International Conference on Case Histories in Geotechnical Engineering

India has seen a substantial growth in various Soil Improvement Techniques over last decade. A particular technique has been chosen based on Project location, Sub soil profile, Technical requirements, Time available and allowed budget for foundation. An expansion was planned for a leading fertilizer plant in North India. Project was located in high seismic zone having PGA of 0.24g. The site was underlain by liquefiable loose fine sands up to depth of 10m to 12m. Existing plant structures were built on Stone Columns few years back. This paper presents a case study where Vibro-compaction technique was successfully used to mitigate …

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Study Of Typical Characteristics Of Expansive Subgrade With Geotextiles And Cushion Materials, Vaishali S. Gor, Liviu S. Thakur, K. R. Biyani Apr 2013

Study Of Typical Characteristics Of Expansive Subgrade With Geotextiles And Cushion Materials, Vaishali S. Gor, Liviu S. Thakur, K. R. Biyani

International Conference on Case Histories in Geotechnical Engineering

Well-built and maintained roads play a major role in the development of a nation. Hence considerable attention is required towards the widening of roads, their stability and periodic repair works. Since the beginning of modern highways, engineers have strived continuously to produce better pavement at lower cost. Most state highways in the central part of India have problems of foundation due to presence of expansive soil i.e. black cotton soil. For the improvement of such problematic soil, conventional technique of soil stabilization, use of cushion, use of moisture barriers, etc. has been adopted. The main objective of the research work …

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M74 Motorway, Glasgow – Geotechnical Aspects Of Design And Construction, Paul Nowak Apr 2013

M74 Motorway, Glasgow – Geotechnical Aspects Of Design And Construction, Paul Nowak

International Conference on Case Histories in Geotechnical Engineering

The 7.8 kilometre long M74 Completion project forms the final part of the motorway box around the city of Glasgow. Construction commenced in May 2008 and was completed in June 2011. The urban route corridor presented many geotechnical challenges to the design and construction teams. It is underlain by Recent, lightly over-consolidated Clyde Alluvium of maximum 35 metres thickness over Glacial Till and Carboniferous Coal Measure Sandstone bedrock. Additionally, it was the location of industries over the 19th and 20th centuries which deposited waste over the natural ground containing chromium, steel works slag and hydrocarbons. The route corridor is also …

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Predicting Landslide Risk Combining Space Measurements And Geotechnical Modeling: Application At Kerasia Slide, C. Stamatopoulos, P. Petridis, L. Balla, I. Parharidis, M. Foumelis, N. Nikolaou, N. Spanou Apr 2013

Predicting Landslide Risk Combining Space Measurements And Geotechnical Modeling: Application At Kerasia Slide, C. Stamatopoulos, P. Petridis, L. Balla, I. Parharidis, M. Foumelis, N. Nikolaou, N. Spanou

International Conference on Case Histories in Geotechnical Engineering

The work developed and applied a methodology combining (a) space measurement of past displacement and (b) geotechnical modelling of displacement to predict and mitigate the risk of ground displacement cased by progressive slope instability. The area of study is in Kerasea village in Plastiras Lake Municipality. The problem under treatment is a creeping landslide in an inhabited area. Mitigation measures were analyzed.

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Access Road Construction Of The Larsi Building Using Reinforced Earth Walls, Amir Eslami Amirabadi, Atefeh Zamani, Cambyse Behnia Apr 2013

Access Road Construction Of The Larsi Building Using Reinforced Earth Walls, Amir Eslami Amirabadi, Atefeh Zamani, Cambyse Behnia

International Conference on Case Histories in Geotechnical Engineering

Mountainous road construction is one of the most difficult and challenging problems in geotechnical engineering. Geometrical complexities and geotechnical conditions make them different from many other urban projects. Retaining wall system is a principal part of these projects. Reinforced Earth Wall system can be considered as an appropriate option for mountainous road construction. In this case history, access road construction of the LARSI building (Shemshak-Iran) is discussed. Shemshak is a tourist town which is located in southern hillsides of the Alborz Mountains. Therefore, the access road is an essential component particularly in cold seasons. Nine terraced levels of the reinforced …

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Two-Tier Retaining Wall System To Support Railroad Embankment Widening, Abhijit R. Sheth, Craig M. Benedict, Ara G. Mouradian, John Brun Apr 2013

Two-Tier Retaining Wall System To Support Railroad Embankment Widening, Abhijit R. Sheth, Craig M. Benedict, Ara G. Mouradian, John Brun

International Conference on Case Histories in Geotechnical Engineering

The National Railroad Passenger Corporation (Amtrak) is replacing the 1907-era two-track bascule bridge over the Niantic River between East Lyme and Waterford, Connecticut, along the heavily traveled Northeast Corridor. Prestressed concrete sheet pile retaining walls were selected to support the new higher approach embankments along both the east and west approaches to the new bridge. Along the west approach a two-tiered wall design was utilized to support a new recreational walkway elevated above the 100-year storm surge elevation for the Niantic Bay, while at the same time keeping the walkway below the level of the adjoining tracks. The design of …

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Csx Railroad Bridge Replacements, Matthew D. Breitenbach, Dawn Edgell, Gary F. Goodheart Apr 2013

Csx Railroad Bridge Replacements, Matthew D. Breitenbach, Dawn Edgell, Gary F. Goodheart

International Conference on Case Histories in Geotechnical Engineering

This paper will discuss the geotechnical aspects of foundation design, construction support, and the team work necessary to replace and upgrade 14 bridges along an existing, trafficked rail line through Central Illinois. Seven bridges were constructed using previously completed designs and seven bridges were constructed using a multi-disciplinary design-build approach. The geotechnical team provided construction support for the Phase I bridges while concurrently conducting geotechnical investigations and developing design criteria for the Phase II bridges. The project also involved many logistical considerations including minimizing bridge “out of service time” to less than ten hours for the construction of each bridge, …

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Investigating The Behaviour Of Natural Slopes And Man Made Structures By Terrestrial Sar Interferometry, Paolo Mazzanti Apr 2013

Investigating The Behaviour Of Natural Slopes And Man Made Structures By Terrestrial Sar Interferometry, Paolo Mazzanti

International Conference on Case Histories in Geotechnical Engineering

Remote sensing techniques for the monitoring of deformation are opening new opportunities in the field of geotechnical engineering and geology. Terrestrial SAR interferometry (TInSAR) is one of the most innovative technique and it promises to be a very effective solution which will be extensively used in the near future. TInSAR is characterized by several interesting features such as: i) high density of information; ii) fully remote capability; iii) long range capability; iv) widespread view; v) spatially continuous efficacy and vi) high accuracy. Thanks to these features TInSAR has been used for investigation and diagnostic purposes (i.e. landslide and structural instability …

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General Report - Session 3, Diego Lo Presti, Mary Perlea, Nunziante Squeglia Apr 2013

General Report - Session 3, Diego Lo Presti, Mary Perlea, Nunziante Squeglia

International Conference on Case Histories in Geotechnical Engineering

This General Report summarizes the 84 papers accepted for the Session 3 focused on: - 3a. Case Histories on Failure and Remediation of Slopes, Dams, Embankments and Landfills (53 papers), - 3b. Case Histories on Failure and Remediation of Retaining Structures, Slurry Walls, and Deep Excavations, Dewatering, Stability (27 papers), - 3c. Improving the Stability and Maintenance of Monuments (4 papers). The papers originate from 26 countries (11 European countries, 3 American countries, 11 Asian countries and 1 African country). The papers cover a number of relevant topics divided into three different sub - sessions. As for the two papers …

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Sensors For Integrated Monitoring And Mitigation Of Erosion, Genda Chen, David Pommerenke, Zhi Zhou, Ying Huang, Andro Radchenko Apr 2013

Sensors For Integrated Monitoring And Mitigation Of Erosion, Genda Chen, David Pommerenke, Zhi Zhou, Ying Huang, Andro Radchenko

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

Methods and systems for measuring erosion. Systems of various embodiments include a sensor adapted to be placed where earthen material is expected to move and to sense a condition related to that movement (for instance, the position of the sensor). The sensor includes a receiver for receiving a wireless signal (be it acoustic, magneto-inductive, etc.) from another sensor which conveys an identifier for the second sensor. The first sensor also includes a signal generator that generates a second (possibly wireless) signal conveying that identifier and its own identifier. Systems of some embodiments include a second receiver placed outside of the …

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North American Standard For Cold-Formed Steel Framing -- General Provisions, 2012 Edition, American Iron And Steel Institute Apr 2013

North American Standard For Cold-Formed Steel Framing -- General Provisions, 2012 Edition, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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North American Standard For Cold-Formed Steel Framing -- Product Data, 2012 Edition, American Iron And Steel Institute Apr 2013

North American Standard For Cold-Formed Steel Framing -- Product Data, 2012 Edition, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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North American Standard For Cold-Formed Steel Framing -- Truss Design, 2012 Edition, American Iron And Steel Institute Apr 2013

North American Standard For Cold-Formed Steel Framing -- Truss Design, 2012 Edition, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Parameters Influencing Pressure During Pumping Of Self-Compacting Concrete, Dimitri Feys, Geert De Schutter, Ronny Verhoeven Apr 2013

Parameters Influencing Pressure During Pumping Of Self-Compacting Concrete, Dimitri Feys, Geert De Schutter, Ronny Verhoeven

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Main Difference between Conventional Vibrated Concrete (CVC) and Self-Compacting Concrete (SCC) is Observed in the Fresh State, as SCC Has a Significantly Lower Yield Stress. on the Other Hand, the Placement of SCC by Means of Pumping is Done with the Same Equipment and Following the Same Practical Guidelines Developed for CVC. It Can Be Questioned Whether the Flow Behavior in Pipes of SCC is Different and Whether the Developed Practical Guidelines Can Still Be Applied. This Paper Describes the Results of Full-Scale Pumping Tests Carried Out on Several SCC Mixtures. It Shows Primarily that the Slump or Yield …

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Special Section On Natural Treatment Systems: More Than Just A Solution To Pollution, Joel Gerard Burken Apr 2013

Special Section On Natural Treatment Systems: More Than Just A Solution To Pollution, Joel Gerard Burken

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

No abstract provided.

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Cold-Formed Steel Bolted Connections Without Washers On Oversized Slotted Holes, Phase 1, American Iron And Steel Institute Mar 2013

Cold-Formed Steel Bolted Connections Without Washers On Oversized Slotted Holes, Phase 1, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Specification For The Design Of Cold-Formed Steel Structural Members, American Iron And Steel Institute Mar 2013

Specification For The Design Of Cold-Formed Steel Structural Members, American Iron And Steel Institute

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

No abstract provided.

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Response Surface Method Based On Radial Basis Functions For Modeling Large-Scale Structures In Model Updating, Linren Zhou, Guirong Yan, Jinping Ou Mar 2013

Response Surface Method Based On Radial Basis Functions For Modeling Large-Scale Structures In Model Updating, Linren Zhou, Guirong Yan, Jinping Ou

Civil, Architectural and Environmental Engineering Faculty Research & Creative Works

The Response Surface (RS) Method based on Radial Basis Functions (RBFs) is Proposed to Model the Input-Output System of Large-Scale Structures for Model Updating in This Article. as a Methodology Study, the Complicated Implicit Relationships between the Design Parameters and Response Characteristics of Cable-Stayed Bridges Are Employed in the Construction of an RS. the Key Issues for Application of the Proposed Method Are Discussed, Such as Selecting the Optimal Shape Parameters of RBFs, Generating Samples by using Design of Experiments, and Evaluating the RS Model. the RS Methods based on RBFs of Gaussian, Inverse Quadratic, Multiquadric, and Inverse Multiquadric Are …

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Real Time Bridge Scour Monitoring With Magneto-Inductive Field Coupling, Andriy V. Radchenko, David Pommerenke, Genda Chen, Pratik Maheshwari, Satyajeet R. Shinde, Viswa Pilla, Y. Rosa Zheng Mar 2013

Real Time Bridge Scour Monitoring With Magneto-Inductive Field Coupling, Andriy V. Radchenko, David Pommerenke, Genda Chen, Pratik Maheshwari, Satyajeet R. Shinde, Viswa Pilla, Y. Rosa Zheng

Electrical and Computer Engineering Faculty Research & Creative Works

Scour was responsible for most of the U.S. bridges that collapsed during the past 40 years. The maximum scour depth is the most critical parameter in bridge design and maintenance. Due to scouring and refilling of river-bed deposits, existing technologies face a challenge in measuring the maximum scour depth during a strong flood. In this study, a new methodology is proposed for real time scour monitoring of bridges. Smart Rocks with embedded electronics are deployed around the foundation of a bridge as field agents. With wireless communications, these sensors can send their position change information to a nearby mobile station. …

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Sheathing Braced Design Of Wall Studs, B. W. Schafer Feb 2013

Sheathing Braced Design Of Wall Studs, B. W. Schafer

American Iron and Steel Institute (AISI) Specifications, Standards, Manuals and Research Reports (1946 - present)

This report was prepared as part of the American Iron and Steel Institute sponsored project: Sheathing Braced Design of Wall Studs. The project also received supplementary support and funding from the Steel Stud Manufacturers Association. Additional project information and documentation is available at www.ce.jhu.edu/bschafer/sheathedwalls. Any opinions, findings, and conclusions or recommendations expressed in this publication are those of the author and do not necessarily reflect the views of the American Iron and Steel Institute, nor the Steel Stud Manufacturers Association.

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Ccfss Special Edition Technical Bulletin Spring 2013, Wei-Wen Yu Center For Cold-Formed Steel Structures Feb 2013

Ccfss Special Edition Technical Bulletin Spring 2013, Wei-Wen Yu Center For Cold-Formed Steel Structures

CCFSS Technical Bulletins (1993 - 2020)

No abstract provided.

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