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Author: Publisher: ISBN: Category : Languages : en Pages : 36
Book Description
The Split-Hopkinson Pressure Bar was used to study the uniaxial stress-strain behavior of compacted moist soils under one-dimensional, undrained, confined compression loading at high strain rates (1000/sec and 2000/ sec. Three soils, Eglin Sand, Tyndall sand and Ottawa 20-20 sand were tested. The results suggest that the stress strain response is dominated by the water- phase from the lock-up strain and beyond. The soil skeleton dominates the response from the start of loading up to the lock-up strain. It appears that there may be some strain-rate effects, however, the data arc insufficient to adequately demonstrate this and further investigation is suggested. The research described in this report has demonstrated that the Split-Hopkinson Bar System is a viable technique for high strain rate dynamic geotechnical testing of unsaturated, saturated, and dry soils, and provides a framework for conducting further studies. Split-Hopkinson pressure bar, Tyndall sand, Ottawa 20-20 sand, Uniaxial stress strain.
Author: Publisher: ISBN: Category : Languages : en Pages : 36
Book Description
The Split-Hopkinson Pressure Bar was used to study the uniaxial stress-strain behavior of compacted moist soils under one-dimensional, undrained, confined compression loading at high strain rates (1000/sec and 2000/ sec. Three soils, Eglin Sand, Tyndall sand and Ottawa 20-20 sand were tested. The results suggest that the stress strain response is dominated by the water- phase from the lock-up strain and beyond. The soil skeleton dominates the response from the start of loading up to the lock-up strain. It appears that there may be some strain-rate effects, however, the data arc insufficient to adequately demonstrate this and further investigation is suggested. The research described in this report has demonstrated that the Split-Hopkinson Bar System is a viable technique for high strain rate dynamic geotechnical testing of unsaturated, saturated, and dry soils, and provides a framework for conducting further studies. Split-Hopkinson pressure bar, Tyndall sand, Ottawa 20-20 sand, Uniaxial stress strain.
Author: Publisher: ISBN: Category : Languages : en Pages : 432
Book Description
Specimens of clayey soils with a controlled pore solution chemistry were prepared, consolidated, and equilibrated at three different soil suction levels. Some specimens were subjected to creep/recovery tests in conventional triaxial cells. These results were used to select viscoelastic models that could explain the specimen behavior. Duplicate specimens equilibrated at the same soil suction levels were tested in a dynamic triaxial test system. For this purpose, the specimen was subjected to a series of stress controlled pulses of 50msec duration and consisting of a ramp-up to a peak deviatoric stress and a ramp-down to zero. The peak stress was increased for successive pulses. The response of the specimen, and the strain-time history, was then recorded. The non-linear viscoelastic models fitted to creep-recovery tests were used in combination with the modified superposition principle to predict the expected response of the specimen. The viscoelastic models that were fitted to the steady creep phase did not provide the best match. It was rather necessary to use the models fitted to the initial part of the transient creep phase ... Creep, High strain rates, Unsaturated clayey soils.
Author: Magued Iskander Publisher: Elsevier ISBN: 0128011556 Category : Science Languages : en Pages : 473
Book Description
Rapid Penetration into Granular Media: Visualizing the Fundamental Physics of Rapid Penetration introduces readers to the variety of methods developed to visualize, observe, and model the rapid penetration of natural and man-made projectiles into earth materials while providing seasoned practitioners with a standard reference that showcases the topic's most recent developments in research and application. There has been a flurry of recently funded research both in the U.S. and Europe on studying the behavior of projectiles in granular media. This book compiles the findings of recent research on the subject and outlines the fundamental physics of rapid earth penetration, and assembles a comprehensive collection of experimental and numerical techniques to study the problem. - Presents a comprehensive interdisciplinary review of the latest research developments in the response of granular media to impact and impulsive loading - Combines the experience of prominent researchers from different disciplines focusing on the challenges presented by impact loading of granular media - Introduces recently developed methods for visualizing the fundamental physics of rapid penetration into granular media
Author: Archie M. Richardson Publisher: ISBN: Category : Languages : en Pages : 93
Book Description
The tests performed at rapid rates of strain were of a preliminary nature and the conclusions drawn are to be used in planning a comprehensive program investigating the effects of strain rate on the stress-strain behavior of saturated soil.
Author: ARCHIE M RICHARDSON (Jr) Publisher: ISBN: Category : Languages : en Pages : 98
Book Description
Investigations were made of the effect of strain rate on the stress vs. strain behavior of two saturated soils. Included are: (a The results and analysis of a series of static triaxial compression tests on a saturated Loess, (b) The results and analysis of a series of rapid triaxial compression tests on a saturated Loess, and (c) The results and analysis of a series of rapid triaxial compression tests on a saturated clay. The static triaxial tests were important in consistently and fully describing the patterns of behavior of the soil during very slowly applied stresses and served as prerequisites to the rapid triaxial tests. The tests performed at rapid rates of strain were of a preliminary nature and the conclusions drawn are to be used in planning a compreh nsive program investigating the effects of strain rate on the stress- strain behavior of saturated soil. (Author).
Author: E. J. Murray Publisher: John Wiley & Sons ISBN: 9781444325041 Category : Technology & Engineering Languages : en Pages : 320
Book Description
An understanding of the mechanical properties of unsaturated soilsis crucial for geotechnical engineers worldwide, as well as tothose concerned with the interaction of structures with the ground.This book deals principally with fine-grained clays and silts, orsoils containing coarser sand and gravel particles but with asignificant percentage of fines. The study of unsaturated soil is a practical subject, linkingfundamental science to nature. Soils in general are inherentlyvariable and their behaviour is not easy to analyse or predict, andunsaturated soils raise the complexity to a higher level. Evenamongst practicing engineers, there is often lack of awareness ofthe intricacies of the subject. This book offers a perspective ofunsaturated soils based on recent research and demonstrates howthis dovetails with the general discipline of soil mechanics. Following an introduction to the basic soil variables, thephases, the phase interactions and the relevance of soil structure,an up-to-date review of laboratory testing techniques is presented.This includes suction measurement and control techniques intriaxial cell testing. This is followed by an introduction tostress state variables, critical state and theoretical models inunsaturated soils. A detailed description of the thermodynamic principles asapplied to multi-phase materials under equilibrium conditionsfollows. These principles are then used to explore and develop afundamental theoretical basis for analysing unsaturated soils. Soilstructure is broken down into its component parts to developequations describing the dual stress regime. The critical statestrength and compression characteristics of unsaturated soils areexamined and it is shown how the behaviour may be viewed as athree-dimensional model in dimensionless stress-volume space. Theanalysis is then extended to the work input into unsaturated soilsand the development of conjugate stress, volumetric andstrain-increment variables. These are used to examine themicromechanical behaviour of kaolin specimens subjected to triaxialshear strength tests and lead to observations not detectable byother means. Unsaturated Soils: A fundamental interpretation of soilbehaviour covers a rapidly advancing area of study, researchand engineering practice and offers a deeper appreciation of thekey characteristics of unsaturated soil. It provides students andresearchers with a framework for understanding soil behaviour anddemonstrates how to interpret experimental strength and compressiondata. provides engineers with a deeper appreciation of keycharacteristics of unsaturated soils covers a rapidly advancing area of study, research andengineering practice provides students and researchers a framework for understandingsoil behaviour shows how to interpret experimental data on strength andcompression the limited number of books on the subject are all out ofdate
Author: A. Tarantino Publisher: CRC Press ISBN: 148228376X Category : Technology & Engineering Languages : en Pages : 208
Book Description
This volume presents the work of postgraduate and postdoctoral researchers on unsaturated soil mechanincs. Topics covered include: innovative experimental techniques; new experimental data on compacted, collapsible and swelling soils; and advances in constitutive modelling.
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Author: Cheng Chang
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Author: Magued Iskander
Author: Archie M. Richardson
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