Prefabricated Vertical Drains Design And Performance
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Prefabricated Vertical Drains Design And Performance
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Author : Robert D. Holtz
language : en
Publisher:
Release Date : 1990
Prefabricated Vertical Drains Design And Performance written by Robert D. Holtz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with Sand drains categories.
Prefabricated Vertical Drains
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Author : Robert D. Holtz
language : en
Publisher:
Release Date : 1991
Prefabricated Vertical Drains written by Robert D. Holtz and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1991 with Drainage categories.
Prefabricated Vertical Drains
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Author : J. J. Rixner
language : en
Publisher:
Release Date : 1986
Prefabricated Vertical Drains written by J. J. Rixner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Road drainage categories.
This volume presents procedures and guidelines applicable to the design and instal tion of prefabricated vertical drains to accelerate consolidation of soils. The contents represent the Consultant's interpretation of the state-of-the-art as of August 1986. The volume is intended to provide assistance to engineers in determining the applicability of PV drains to a given project and in the design of PV drain systems. The information contained herein is intended for use by civil engineers familiar with the fundamentals of soil mechanics and the principles of precompression. The volume includes descriptions of types and physical characteristics of PV drains, discussion of design considerations, recommended design procedures, guideline specifications and comments pertaining to installation guidelines, construction control, and performance evaluation. This volume is the first in a series. The others in the series are: FHWA No. Vol. No. Title RD-861169 - II Prefabricated Vertical Drains: Summary of Research Effort RD-861170 III Prefabricated Vertical Drains: Laboratory Data Report RD-861171 I Geocomposite Drains: Engineering Assessment and Preliminary Guidelines RD-861172 II Geocomposite Drains: Laboratory Data Report.
The Performance Of Lateral Spread Sites Treated With Prefabricated Vertical Drains
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Author : Rachelle Lee Howell
language : en
Publisher:
Release Date : 2013
The Performance Of Lateral Spread Sites Treated With Prefabricated Vertical Drains written by Rachelle Lee Howell and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013 with categories.
Drainage methods for liquefaction remediation have been in use since the 1970's and have traditionally included stone columns, gravel drains, and more recently prefabricated vertical drains. The traditional drainage techniques such as stone columns and gravel drains rely upon a combination of drainage and densification to mitigate liquefaction and thus, the improvement observed as a result of these techniques cannot be ascribed solely to drainage. Therefore, uncertainty exists as to the effectiveness of pure drainage, and there is some hesitancy among engineers to use newer drainage methods such as prefabricated vertical drains, which rely primarily on drainage rather than the combination of drainage and densification. Additionally, the design methods for prefabricated vertical drains are based on the design methods developed for stone columns and gravel drains even though the primary mechanisms for remediation are not the same. The objectives of this research are to use physical and numerical models to assess the effectiveness of drainage as a liquefaction remediation technique and to identify the controlling behavioral mechanisms that most influence the performance of sites treated with prefabricated vertical drains. In the first part of this research, a suite of three large-scale dynamic centrifuge tests of untreated and drain-treated sloping soil profiles was performed. Acceleration, pore pressure, and deformation data was used to evaluate the effectiveness of drainage in reducing liquefaction-induced lateral deformations. The results showed that the drains reduced the generated peak excess pore pressures and expedited the dissipated of pore water pressures both during and after shaking. The influence of the drains on the excess pore pressure response was found to be sensitive to the characteristics of the input motion. The drainage resulted in a 30 to 60% reduction in the horizontal deformations and a 20 to 60% reduction in the vertical settlements. In the second part of this research, the data and insights gained from the centrifuge tests was used to develop numerical models that can be used to investigate the factors that most influence the performance of untreated and drain-treated lateral spread sites. Finite element modeling was performed using the OpenSees platform. Three types of numerical models were developed - 2D infinite slope unit cell models of the area of influence around a single drain, 3D infinite slope unit cell models of the area of influence around a single drain, and a full 2D plane strain model of the centrifuge tests that included both the untreated and drain-treated slopes as well as the centrifuge container. There was a fairly good match between the experimental and simulated excess pore pressures. The unit cell models predicted larger horizontal deformations than were observed in the centrifuge tests because of the infinite slope geometry. Issues were identified with the constitutive model used to represent the liquefiable sand. These issues included a coefficient of volumetric compressibility that was too low and a sensitivity to low level accelerations when the stress path is near the failure surface. In the final part of this research, the simulated and experimental data was used to examine the relationship between the generated excess pore water pressures and the resulting horizontal deformations. It was found that the deformations are directly influenced by both the excess pore pressures and the intensity of shaking. There is an excess pore pressure threshold above which deformations begin to become significant. The horizontal deformations correlate well to the integral of the average excess pore pressure ratio-time history above this threshold. They also correlate well to the Arias intensity and cumulative absolute velocity intensity measures.
Soil Improvement
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Author : Jian Chu
language : en
Publisher: Thomson Learning Asia
Release Date : 2003
Soil Improvement written by Jian Chu and has been published by Thomson Learning Asia this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Science categories.
Illustrates both theoretical and practical aspects of soil improvement with frequent references to several land reclamation and soil improvement projects in Asia. Consolidation theories and numerical methods involving vertical drains are presented, and selection of appropriate design parameters for soil improvement using prefabricated vertical drains is discussed.
Problematic Soils And Geoenvironmental Concerns
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Author : Madhavi Latha Gali
language : en
Publisher: Springer Nature
Release Date : 2020-09-11
Problematic Soils And Geoenvironmental Concerns written by Madhavi Latha Gali and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-09-11 with Science categories.
This volume comprises select papers presented during the Indian Geotechnical Conference 2018. This volume focuses on discussing the many challenges encountered in geoenvironmental engineering. The book covers sustainability aspects related to geotechnical engineering, problematic soils and ground improvement, use of geosynthetics and concepts of soil dynamics. The contents of this book will be useful to researchers and professionals working in geo-environmental engineering and to policy makers interested in understanding geotechnical concerns related to sustainable development.
Prefabricated Vertical Drains
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Author : J. J. Rixner
language : en
Publisher:
Release Date : 1986
Prefabricated Vertical Drains written by J. J. Rixner and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Road drainage categories.
Ground Improvement
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Author : Cholachat Rujikiatkamjorn
language : en
Publisher: Elsevier
Release Date : 2005-11-07
Ground Improvement written by Cholachat Rujikiatkamjorn and has been published by Elsevier this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-11-07 with Science categories.
The first book of its kind, providing over thirty real-life case studies of ground improvement projects selected by the worlds top experts in ground improvement from around the globe. Volume 3 of the highly regarded Elsevier Geo-engineering book series coordinated by the Series Editor: Professor John A Hudson FREng. An extremely reader friendly chapter format. Discusses wider economical and environmental issues facing scientists in the ground improvement. Ground improvement has been both a science and art, with significant developments observed through ancient history. From the use of straw as blended infill with soils for additional strength during the ancient Roman civilizations, and the use of elephants for compaction of earth dams during the early Asian civilizations, the concepts of reinforced earth with geosynthetics, use of electrokinetics and thermal modifications of soils have come a long way. The use of large and stiff stone columns and subsequent sand drains in the past has now been replaced by quicker to install and more effective prefabricated vertical drains, which have also eliminated the need for more expensive soil improvement methods. The early selection and application of the most appropriate ground improvement techniques can improve considerably not only the design and performance of foundations and earth structures, including embankments, cut slopes, roads, railways and tailings dams, but also result in their cost-effectiveness. Ground improvement works have become increasingly challenging when more and more problematic soils and marginal land have to be utilized for infrastructure development. This edited compilation contains a collection of Chapters from invited experts in various areas of ground improvement, who have illustrated the basic concepts and the applications of different ground improvement techniques using real projects that they have been involved in. The case histories from many countries ranging from Asia, America, Australia and Europe are addressed.
Performance Of A Prefabricated Vertical Drain Installation Beneath An Embankment
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Author : Zenon G. Kyfor
language : en
Publisher:
Release Date : 1988
Performance Of A Prefabricated Vertical Drain Installation Beneath An Embankment written by Zenon G. Kyfor and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Road drainage categories.
Soft Ground Improvement
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Author : D. T. Bergado
language : en
Publisher: American Society of Civil Engineers
Release Date : 1996
Soft Ground Improvement written by D. T. Bergado and has been published by American Society of Civil Engineers this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with Science categories.
Tables, charts, figures, and photographs illustrate significant points throughout the text.