The Performance Of Lateral Spread Sites Treated With Prefabricated Vertical Drains
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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.
Icpmg2014 Physical Modelling In Geotechnics
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Author : Christophe Gaudin
language : en
Publisher: CRC Press
Release Date : 2019-01-08
Icpmg2014 Physical Modelling In Geotechnics written by Christophe Gaudin and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-01-08 with Technology & Engineering categories.
The 8th International Conference on Physical Modelling in Geotechnics (ICPMG2014) was organised by the Centre for Offshore Foundation Systems at the University of Western Australia under the auspices of the Technical Committee 104 for Physical Modelling in Geotechnics of the International Society of Soil Mechanics and Geotechnical Engineering. This quadrennial conference is the traditional focal point for the physical modelling community of academics, scientists and engineers to present and exchange the latest developments on a wide range of physical modelling aspects associated with geotechnical engineering. These proceedings, together with the seven previous proceedings dating from 1988, present an inestimable collection of the technical and scientific developments and breakthroughs established over the last 25 years. These proceedings include 10 keynote lectures from scientific leaders within the physical modelling community and 160 peer-reviewed papers from 26 countries. They are organised in 14 themes, presenting the latest developments in physical modelling technology, modelling techniques and sensors, through a wide range of soil-structure interaction problems, including shallow and deep foundations, offshore geotechnics, dams and embankments, excavations and retaining structures and slope stability. Fundamental aspects of earthquake engineering, geohazards, ground reinforcements and improvements, and soil properties and behaviour are also covered, demonstrating the increasing complexity of modelling arising from state-of-the-art technological developments and increased understanding of similitude principles. A special theme on education presents the latest developments in the use of physical modelling techniques for instructing undergraduate and postgraduate students in geotechnical engineering.
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 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.
Evaluation Of Wick Drain Performance In Virginia Soils
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Author : Susan E. Burns
language : en
Publisher:
Release Date : 2003
Evaluation Of Wick Drain Performance In Virginia Soils written by Susan E. Burns and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Drainage categories.
Prefabricated vertical drains (PVD), also known as wick drains, are commonly used to accelerate the consolidation of fine-grained soils in order to reduce future settlements and increase shear strength. Various drain designs are currently on the market, with significant variations in price. This variability of designs makes the performance highly product specific. Tests were carried out to assess the behavior of several wick drains in Virginia soils. Drains were subjected to crimping, lateral pressure, and consolidation, with the resulting impact on the flow rate. All tests were performed in the laboratory to ensure controlled boundary and initial conditions. Significant differences in the performance of wick drains were evaluated. The performance was quantified based on the percentage reduction in flow capacity during flow in a crimped position, percentage reduction in flow capacity under lateral stress, and percentage reduction in the consolidation time. Test results identified the Ameridrain AD607 and Mebra-Drain MD-88 as themost effective drains among those studied.
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.
Effectiveness Of Prefabricated Vertical Drains For Liquefaction Remediation
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Author : Rachelle Lee Howell
language : en
Publisher:
Release Date : 2008
Effectiveness Of Prefabricated Vertical Drains For Liquefaction Remediation 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 2008 with categories.
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.
Soil Flushing Performance Characteristics Using Prefabricated Vertical Drains In Glacial Till
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Author : Kimberly Anne Gates
language : en
Publisher:
Release Date : 1999
Soil Flushing Performance Characteristics Using Prefabricated Vertical Drains In Glacial Till written by Kimberly Anne Gates and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with Soil remediation 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.