Download or read book Particle Morphology and Its Influence on Friction and Dilatancy of Sands written by Karen Carmen Lee and published by . This book was released on 2017 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle morphology outlines the general analytical method used to describe soil particles' structure and shape. The characteristics defining this term include sphericity, roundness, and surface texture. Particle morphology has a significant influence on sand behavior and consequently affects dilatancy and friction. Understanding the relationship between shear strength parameters and particle morphology answers fundamental questions about the mechanics of granular materials in general and has the potential to enhance the development of advanced constitutive models that describe granular materials' behavior. Many researchers have reported measurements for sphericity, roundness, and surface texture using both two-dimensional (2D) and three-dimensional (3D) images to analyze the effects on granular materials' friction and dilatancy angles. This thesis investigates the influence of morphology measurements from 3D images on friction and dilatancy of three types of sands (#1 Dry Glass, GS#40 Columbia, and F-35 Ottawa Sand) and on glass beads. A series of direct shear experiments were conducted at various normal stresses and densities to achieve this goal. Experimental measurements of friction and dilatancy angles were compared to findings in a previous study. A stepwise regression analysis was performed to develop statistical models predicting friction and dilatancy using the specimen's relative density, normal stress, and particle morphology as input parameters. This thesis discusses how these explanatory variables affect the model and compares the experimental results with the predicted values. A reasonable agreement is found between the model's predictions and the experimental results. The development of simple statistical models capable of accurately predicting friction and dilatancy values has a major impact on many field applications (e.g., processing granular materials for industrial and engineering purposes, foundation design, landslides, agricultural and pharmaceutical products, and future research on granular materials' behavior). This study contributes to further advancements in theories predicting granular materials' behavior and provides experimental evidence to support improvements of constitutive models that describe the behavior of sands.

Download or read book The Effects of Suppression of Dilation on the Shear Strength of Sands written by Timothy Christopher Matthew House and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is known that peak angle of friction (_p^') for sands decreases as normal stress increases until critical state. The suppression of dilation of sands as normal stresses increase results in particle breakage, which contributes to this reduction in peak strength. There is still disagreement regarding how suppression of dilation and particle breakage affects sands critical state angle of friction (_cs^'). A total of 178 direct shear tests on three different sand types were completed to investigate the effects of suppression of dilation on the shear strength of sands, as well as effects of particle size, shape and sample size. _p^' decreased with suppression of dilation as expected. In general, _cs^' decreased by 7-9.5o as dilation was suppressed, and was found to decrease with increasing particle size. Particle shape showed less influence on _cs^' as dilation was suppressed. The effects of particle shape and sample size on _cs^' were more difficult to quantify.

Download or read book Behaviour of Granular Materials written by Bernard Cambou and published by Springer. This book was released on 2014-05-04 with total page 403 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents a complete and comprehensive analysis of the behaviour of granular materials including the description of experimental results, the different ways to define the global behaviour from local phenomena at the particle scale, the various modellings which can be used for a D.E.M. analysis to solve practical problems and finally the analysis of strain localisation. The concepts developed in this book are applicable to many kinds of granular materials considered in civil, mechanical or chemical engineering.

Download or read book Particle Morphology of Geotechnics written by Devapriya Wijeyesekera and published by LAP Lambert Academic Publishing. This book was released on 2014-07-11 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book describes the key factors of particle morphology quantification and its characteristics that govern the interparticle behaviour of granular soils. A standardised and cost effective method of quantifying particle shape parameters has not been widely recognised yet, therefore the methods are still being debated today. In this booklet, explanation of a new approach of particle shape classification was presented. Cluster and statistical analysis was used to find a single representative value of the particle shape parameters from 5 different sand samples. With that, the behaviour of the shear strength and dilatancy parameters of granular soils was able to be understood clearly. Thus, this contributes in improving the fundamental understanding on the development of parametric correlations on the strength behaviour of sands based on the new methods of particle morphology classification.

Download or read book Particulate Discrete Element Modelling written by Catherine O'Sullivan and published by CRC Press. This book was released on 2011-04-06 with total page 574 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first single work on DEM providing the information to get started with this powerful numerical modelling approach. Provides the basic details of the numerical method and the approaches used to interpret the results of DEM simulations. It will be of use to professionals, researchers and higher level students, with a theoretical overview of DEM as well as practical guidance.Selected Contents: 1.Introduction 2.Use of DEM in Geomechanics 3.Calculation of Contact Forces 4.Particle Motion 5.Particle Types 6.Boundary Conditions 7.Initial Geometry and Specimen Generation 8.Time Integration and Discrete Element Modelling 9.DEM Interpretation: A Continuum Perspective 10.Postprocessing: Graphical Interpretation of DEM Simulations 11.Basic Statisti

Download or read book Particle Shape and Stiffness written by Jake Steven Dodds and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle shape is evaluated on three scales corresponding to form, roundness and roughness. Shape at each of these scales uniquely influences material behavior. The shape of sand grains is largely formed as magma cools. Subsequent cleavage and abrasion change the roundness and roughness of particles. Published results indicate that particle shape influences several aspects of granular systems behavior including stiffness, strength, the evolution of strength anisotropy, dilation, and the development of strain localization. crushing of granite creates a particulate material with a unique angular shape. A wide range of the experimental studies implemented as part of this research permit assembling a unique database of material parameters and comparing the behavior of several crushed and natural sands. In general, the low roundness of crushed sands leads to higher maximum void ratios, lower small strain stiffnesses, and higher critical state friction angles than more rounded natural sands. It also impacts mortar strength and workability. Previous studies have emphasized size-controlled segregation. New experimental results show that differences in particle shape can also lead to segregation in a binary granular material. Round or spherical particles are more mobile than angular or flat particles. Then, the greater motion of round or spherical particles in a binary mixture subjected to horizontal or vertical vibration results in their segregation from their angular or flat neighbors. Particle shape may change significantly with stress in the case of soft particles. Therefore, the presence of shape-deformable particles decreases the stiffness of binary rigid-soft particle mixtures. However, macro-scale measurements with rigid-soft mixtures show higher stiffness than would be expected by volume averaging techniques. A subsequent microscale study shows the formation of backbone chains made of the rigid particles, partially supported by the soft particles which prevent the buckling of the load-carrying chains.

Download or read book Sustainable Buildings and Structures Building a Sustainable Tomorrow written by Konstantinos Papadikis and published by CRC Press. This book was released on 2019-09-26 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sustainable Buildings and Structures: Building a Sustainable Tomorrow collects the contributions presented at the 2nd International Conference on Sustainable Buildings and Structures (Suzhou, China, 25-27 October 2019). The papers aim at sharing the state-of-the-art on sustainable approaches to engineering design and construction, and cover a wide range of topics: Sustainable Construction Materials Sustainable Design in Built Environment Green and Low Carbon Buildings Smart Construction and Construction Management Sustainable Buildings and Structures: Building a Sustainable Tomorrow will be of interest to academics, professionals, industry representatives and local government officials involved in civil engineering, architecture, urban planning, structural engineering, construction management and other relate fields.

Download or read book Proceedings of the 7th International Conference on Discrete Element Methods written by Xikui Li and published by Springer. This book was released on 2016-12-01 with total page 1414 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book presents the latest advances in Discrete Element Methods (DEM) and technology. It is the proceeding of 7th International Conference on DEM which was held at Dalian University of Technology on August 1 - 4, 2016. The subject of this book are the DEM and related computational techniques such as DDA, FEM/DEM, molecular dynamics, SPH, Meshless methods, etc., which are the main computational methods for modeling discontinua. In comparison to continua which have been already studied for a long time, the research of discontinua is relatively new, but increases dramatically in recent years and has already become an important field. This book will benefit researchers and scientists from the academic fields of physics, engineering and applied mathematics, as well as from industry and national laboratories who are interested in the DEM.

Download or read book Geomechanics and Geotechnics of Particulate Media written by Masayuki Hyodo and published by CRC Press. This book was released on 2017-12-14 with total page 538 pages. Available in PDF, EPUB and Kindle. Book excerpt: Microscopic re-examination of geomaterials consisting of aggregates can shed light on macroscopic behaviour, including compressibility, anisotropy, yielding, creep, cyclic liquefaction and shear rupture. As a result of this process of examination, new methods of material characterization emerge, leading to a greater degree of accuracy in the specification of new constitutive models with physically-meaningful parameters. The impetus behind this development is an increasing awareness on sustainability, leading to the more efficient use of recycled materials for geotechnical applications. The characteristics of recycled materials, such as compressibility and self-hardening, may differ significantly from those of natural materials, and it is crucial that evaluation is made from a specifically particulate perspective.

Download or read book Canadian Geotechnical Journal written by and published by . This book was released on 2010 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Engineering for Calcareous Sediments Volume 1 written by D. Andrews and published by CRC Press. This book was released on 2021-05-30 with total page 344 pages. Available in PDF, EPUB and Kindle. Book excerpt: Volume 1 of the Proceedings of the International Society of Soil Mechanics and Foundation Engineering, Institution of Engineers Australia with the main topic of Engineering for Calcareous Sediments held in 1988.

Download or read book The Engineering of Foundations Slopes and Retaining Structures written by Rodrigo Salgado and published by CRC Press. This book was released on 2022-06-01 with total page 1022 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Engineering of Foundations, Slopes and Retaining Structures rigorously covers the construction, analysis, and design of shallow and deep foundations, as well as retaining structures and slopes. It includes complete coverage of soil mechanics and site investigations. This new edition is a well-designed balance of theory and practice, emphasizing conceptual understanding and design applications. It contains illustrations, applications, and hands-on examples that continue across chapters. Soil mechanics is examined with full explanation of drained versus undrained loading, friction and dilatancy as sources of shear strength, phase transformation, development of peak effective stress ratios, and critical-state and residual shear strength. The design and execution of site investigations is evaluated with complete discussion of the CPT and SPT. Additional topics include the construction, settlement and bearing capacity of shallow foundations, as well as the installation, ultimate resistance and settlement of deep foundations. Both traditional knowledge and methods and approaches based on recent progress are available. Analysis and design of retaining structures and slopes, such as the use of slope stability software stability calculations, is included. The book is ideal for advanced undergraduate students, graduate students and practicing engineers and researchers.

Download or read book GCEC 2017 written by Biswajeet Pradhan and published by Springer. This book was released on 2018-05-12 with total page 1503 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers the proceedings of the 1st Global Civil Engineering Conference, GCEC 2017, held in Kuala Lumpur, Malaysia, on July 25–28, 2017. It highlights how state-of-the-art techniques and tools in various disciplines of Civil Engineering are being applied to solve real-world problems. The book presents interdisciplinary research, experimental and/or theoretical studies yielding new insights that will advance civil engineering methods. The scope of the book spans the following areas: Structural, Water Resources, Geotechnical, Construction, Transportation Engineering and Geospatial Engineering applications.

Download or read book Mechanics of Granular Materials An Introduction written by K. Iwashita and published by CRC Press. This book was released on 2020-08-13 with total page 408 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook compiles reports written by about 35 internationally recognized authorities, and covers a range of interests for geotechnical engineers. Topics include: fundamentals for mechanics of granular materials; continuum theory of granular materials; and discrete element approaches.

Download or read book Deformation Characteristics of Geomaterials written by V.A. Rinaldi and published by IOS Press. This book was released on 2015-12-11 with total page 1236 pages. Available in PDF, EPUB and Kindle. Book excerpt: In November 2015, Buenos Aires, Argentina became the location of several important events for geo-professionals, with the simultaneous holding of the 6th International Symposium on Deformation Characteristics of Geomaterials, the 15th Pan-American Conference on Soil Mechanics and Geotechnical Engineering (XV PCSMGE), the 8th South American Congress on Rock Mechanics (SCRM), as well as the 22nd Argentinean Congress of Geotechnical Engineering (CAMSIGXXII). This synergy provided a unique opportunity to exchange ideas and discuss current and future practices in the areas of soil mechanics and rock mechanics, and their applications in civil, energy, environmental, and mining engineering. This book presents the proceedings of the 6th International Symposium on Deformation Characteristics of Geomaterials. As well as 118 articles selected for publication after peer review, it includes 7 lectures delivered by invited keynote speakers and the Third Bishop Lecture, delivered by Professor Herve Di Benedetto of the University of Lyon, France, who presented a reference work on the advanced testing and modeling of bituminous bounded and unbounded granular materials. The conference brought together practitioners, researchers and educators from around the world engaged in the understanding of the deformation properties of geo-materials before failure, and the small strain parameters as fundamental characteristics of geo-materials. The main topics covered by the symposium include experimental investigations from very small strains to beyond failure, including multi-physical approach; HTC M coupling behavior, characterization and modeling of various geo-materials and interfaces; and practical prediction and interpretation of ground responses: field observation and case histories.

Download or read book Effect of Particle Morphology on the Deformation Behavior of Sand Under Monotonic Loading Conditions written by Alexia Rose Leib and published by . This book was released on 2015 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt: When a projectile hits sand, the projectile places high stresses on the sand surface. Granular materials at high stresses are liable to crushing. The pressure at which crushing occurs depends greatly on particle shape and relative density. These parameters also greatly influence the changes in particle shape and size after crushing. Additionally, projectiles fired at extremely high velocities are preceded by a pressure wave. This pressure wave can crush granular material before the projectile ever touches the surface. If the sand has been crushed and its inherent particle properties changed before projectile impact, the projectile may not behave as expected. Therefore, it is imperative to understand a wide variety of strength parameters in order to understand the mechanics of sands with different morphology. Furthermore, when performing experiments to obtain strength parameters, it is important to understand the limitations of these experiments. Particle size distribution methods such as standard sieve tests, imaging analysis, and light scattering techniques all involve a level of bias particle size bias in the data acquisition process. Additionally, standard triaxial testing assumes constant strain throughout the specimen based on overall displacement of the specimen during testing. This is an invalid assumption as strain localization occurs very early during testing and causes strain concentrations near the center of the specimen.

Download or read book Report of Investigations written by and published by . This book was released on 1973 with total page 486 pages. Available in PDF, EPUB and Kindle. Book excerpt: