[PDF] Permanent Deformation Behavior Of Unbound Granular Materials And Rutting Model Development eBook

Author : Charles Vance Droddy
Publisher :
Page : pages
File Size : 45,56 MB
Release : 2015
Category :
ISBN :

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Permanent deformation of unbound base course materials under flexible pavements continue to be a significant source of the rutting observed at the surface. The permanent deformation behavior of unbound aggregate bases (UAB) has been documented by several authors. Several models have been proposed to predict the permanent deformation (rutting) occurring in the UAB. Most of the models do not take into account the stress dependent characteristics of UAB or have parameters which vary with stress state. An improved model has been developed at Texas A&M University which includes the stress dependency in the model and this new approach has been validated. This new model incorporates power functions of the first and second invariants of the stress tensor directly in the model along with the [lowercase Epsilon symbol]0 , [lowercase Rho symbol] , and [lowercase Beta symbol] from existing single stage models. Several previous models attempted to achieve this by using the stress as a parameter in the fitting coefficients. This left many with relatively low values of R2 or with widely varying coefficients for a range of stress states. By using the stress state directly in the model, a generalized set of fitting parameters for a given material type have been generated. Using these generalized fitting parameters, it is shown that the new model fits the experimental data on a fundamental level. The electronic version of this dissertation is accessible from http://hdl.handle.net/1969.1/155556

Author : Douglas M. Marshall
Publisher : CRC Press
Page : 1944 pages
File Size : 14,99 MB
Release : 2015-10-26
Category : Political Science
ISBN : 113802693X

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The proliferation of technological capability, miniaturization, and demand for aerial intelligence is pushing unmanned aerial systems (UAS) into the realm of a multi-billion dollar industry. This book surveys the UAS landscape from history to future applications. It discusses commercial applications, integration into the national airspace system (NAS), System function, operational procedures, safety concerns, and a host of other relevant topics. The book is dynamic and well-illustrated with separate sections for terminology and web- based resources for further information.

Author : Andrew Dawson
Publisher : CRC Press
Page : 388 pages
File Size : 11,71 MB
Release : 2014-09-01
Category : Technology & Engineering
ISBN : 9781439833803

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Nearly all highway, airport, dock and industrial pavements contain large quantities of untreated aggregate in the form of unbound pavement layers. In many pavements, which are lightly or moderately trafficked, crushed rock or gravel derived aggregates comprise the majority of the construction or, in the case of unsealed pavements, all of the structure. This book provides studies of the performance and description of this material that will help the reader to better understand its characteristics and behaviour both alone and as part of the pavement structure it forms. This work will be useful to practitioners, policy makers, researchers and students. It forms a sequel to the earlier book "Unbound Aggregates in Road Construction" also published by Balkema

Author : N.P. López-Acosta
Publisher : IOS Press
Page : 3006 pages
File Size : 40,34 MB
Release : 2019-11-26
Category : Technology & Engineering
ISBN : 1643680315

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The first Pan-American Conference on Soil Mechanics and Geotechnical Engineering (PCSMGE) was held in Mexico in 1959. Every 4 years since then, PCSMGE has brought together the geotechnical engineering community from all over the world to discuss the problems, solutions and future challenges facing this engineering sector. Sixty years after the first conference, the 2019 edition returns to Mexico. This book, Geotechnical Engineering in the XXI Century: Lessons learned and future challenges, presents the proceedings of the XVI Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XVI PCSMGE), held in Cancun, Mexico, from 17 – 20 November 2019. Of the 393 full papers submitted, 335 were accepted for publication after peer review. They are included here organized into 19 technical sessions, and cover a wide range of themes related to geotechnical engineering in the 21st century. Topics covered include: laboratory and in-situ testing; analytical and physical modeling in geotechnics; numerical modeling in geotechnics; unsaturated soils; soft soils; foundations and retaining structures; excavations and tunnels; offshore geotechnics; transportation in geotechnics; natural hazards; embankments and tailings dams; soils dynamics and earthquake engineering; ground improvement; sustainability and geo-environment; preservation of historic sites; forensics engineering; rock mechanics; education; and energy geotechnics. Providing a state-of-the-art overview of research into innovative and challenging applications in the field, the book will be of interest to all those working in soil mechanics and geotechnical engineering. In this proceedings, 58% of the contributions are in English, and 42% of the contributions are in Spanish or Portuguese.

Author : Rajat Rastogi
Publisher : Springer Nature
Page : 417 pages
File Size : 30,86 MB
Release : 2023-07-24
Category : Technology & Engineering
ISBN : 9819931428

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This book presents the select proceedings of the 2nd International Conference on Transportation Infrastructure Projects: Conception to Execution (TIPCE 2022) and emphasizes the understanding of transportation infrastructure projects being conceptualized, designed, and executed so as to bring the desired development in the focused area. It comprises case studies from the transportation sector, construction industries, consulting agencies, and academia. These studies present the bottlenecks experienced during the implementation of the projects, from their conceptualization to their execution and the corrective measures that were incorporated to finish the work. The book will be a valuable reference for beginners, researchers, and professionals interested in construction planning and technology, infrastructure engineering, highway engineering, traffic and transportation planning and systems.

Author : Inge Hoff
Publisher : CRC Press
Page : 501 pages
File Size : 25,17 MB
Release : 2021-11-10
Category : Technology & Engineering
ISBN : 1000533336

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Innovations in Road, Railway and Airfield Bearing Capacity – Volume 1 comprises the first part of contributions to the 11th International Conference on Bearing Capacity of Roads, Railways and Airfields (2022). In anticipation of the event, it unveils state-of-the-art information and research on the latest policies, traffic loading measurements, in-situ measurements and condition surveys, functional testing, deflection measurement evaluation, structural performance prediction for pavements and tracks, new construction and rehabilitation design systems, frost affected areas, drainage and environmental effects, reinforcement, traditional and recycled materials, full scale testing and on case histories of road, railways and airfields. This edited work is intended for a global audience of road, railway and airfield engineers, researchers and consultants, as well as building and maintenance companies looking to further upgrade their practices in the field.

Author : D. Manzanal
Publisher : IOS Press
Page : 3344 pages
File Size : 19,54 MB
Release : 2015-12-11
Category : Technology & Engineering
ISBN : 1614996032

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The work of geotechnical engineers contributes to the creation of safe, economic and pleasant spaces to live, work and relax all over the world. Advances are constantly being made, and the expertise of the profession becomes ever more important with the increased pressure on space and resources. This book presents the proceedings of the 15th Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XV PCSMGE), held in Buenos Aires, Argentina, in November 2015. This conference, held every four years, is an important opportunity for international experts, researchers, academics, professionals and geo-engineering companies to meet and exchange ideas and research findings in the areas of soil mechanics, rock mechanics, and their applications in civil, mining and environmental engineering. The articles are divided into nine sections: transportation geotechnics; in-situ testing; geo-engineering for energy and sustainability; numerical modeling in geotechnics; foundations and ground improvement; unsaturated soil behavior; embankments, dams and tailings; excavations and tunnels; and geo-risks, and cover a wide spectrum of issues from fundamentals to applications in geotechnics. This book will undoubtedly represent an essential reference for academics, researchers and practitioners in the field of soil mechanics and geotechnical engineering. In this proceedings, approximately 65% of the contributions are in English, and 35% of the contributions are in Spanish or Portuguese.