Download or read book Numerical Simulations of Spread Foundations Supported on Stone Columns Using the Discrete Element Method written by Anibal Enrique Santos Marin and published by . This book was released on 2020 with total page 316 pages. Available in PDF, EPUB and Kindle. Book excerpt: The implementation of stone columns as a ground improvement technique has become more popular in geotechnical construction practice as a result of their ability to improve strength, stiffness and permeability characteristics of weak clayey soil deposits. There are several analytical and empirical approaches to estimate the bearing capacity of stone column foundation systems; however, there is notable variation in the performance of these existing methods when compared with full-scale experimental results. For very weak cohesive soils (i.e., undrained shear strength less than 15 kPa), the use of conventional stone columns becomes restricted because of the insufficient confinement that these types of soils can provide to the columns. Hence, the inclusion of cement-coated aggregate has been developed as an alternative method to improve the efficacy of stone columns in soft soils. Limited information is available regarding the global performance, load-transfer mechanism, and design of these types of cemented stone columns under various field conditions. Efforts to refine the accuracy of current design methods and reinforcement techniques for conventional stone columns naturally point to the need for improving the understanding of the fundamental load-transfer mechanisms of stone columns. Three-dimensional discrete element method (DEM) simulations of small- and full-scale footing loading tests were developed to investigate the effects of aggregate strength, pier length, aggregate Young's modulus, area replacement ratio, cement content, and undrained shear strength of the matrix soil on the bearing pressure-displacement responses of isolated foundations supported on stone columns. The elemental responses of the aggregate and plastic matrix soil were calibrated against laboratory and in-situ test data from a well-characterized site and compared against the results of small- and full-scale footing loading tests. The column aggregate material was represented by discrete-deformable tetrahedrons in conjunction with strain-softening and strain-hardening models in order to improve the simulation of the nonlinear response of the cemented aggregate. Joined deformable blocks were employed to represent the continuous mechanical behavior of the surrounding clayey soil. The numerical results are in excellent agreement with the experimental laboratory and field data and provide improved estimates of the bearing pressure-displacement curves of the column-foundation systems investigated in this study. The Young's modulus of the aggregate column and the area replacement ratio were found to have the greatest influence on the bearing pressure-displacement response. The DEM results also improve the understanding of the effects of granular material-cementation on the performance of stone columns. At low cement contents the stone column exhibits a type of bulging failure mechanism similar to uncemented stone columns, but at higher cement contents (10 % in this study), bulging is not observed, and the behavior resembles more like that of a concrete pile. These types of behavioral differences also have different implications for single isolated stone columns and group column behavior.

Download or read book Advanced Numerical Methods in Foundation Engineering written by Hany Shehata and published by Springer Nature. This book was released on 2019-11-01 with total page 156 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book deals with the advanced analysis of the shallow foundations. Several research studies are considered including soil plasticity, cracking, reaching the soil bearing capacity, and creep. Dynamic analyses together with stability analysis are also included. It gives a wide range of dealing with the shallow foundations in different parts of the world.

Download or read book Numerical Analysis of Stone Column Ground Improvement Under Compression Loading with Emphases on the Soil structure Interaction Effect written by Wjdan Dhaif Sahi and published by . This book was released on 2020 with total page 294 pages. Available in PDF, EPUB and Kindle. Book excerpt: As the foundation is considered the major component in a structure that transfers the load to the strong strata and makes the structure stable, attention is required during the design process to select the best type of foundation. A deep foundation is considered the solution in supporting a deep, weak soil, the ground improvement is considered most economical solution in many structural developments. Among the different types of ground improvement, the stone column is an effective method to improve soft soil because it increases the bearing capacity of the soil, works as a drainage path, reduces the settlement, and is cost-effective and environmentally friendly. As an effective technique, many researchers have put forth efforts to study the behavior and optimize the performance of the stone column. However, because of deficiencies related to the column-soil system modeling, interaction modeling, full-scale field simulation, effect of column backfill material types, and loading type, further studies need to be undertaken. This research focuses on developing a numerical analysis using the finite element method to simulate Bangkok soft clay in Thailand that is reinforced with granular piles including either sand, gravel, or crushed material and that incorporates the advanced soil constitutive model and mechanical types of contact available in ABAQUS. The simulation was conducted to highlight the key aspects that would improve the performance of a foundation system of soft soil reinforced with a stone/granular column under a full response state. In addition, to verify the behavior of the column under a compression load with a focus on the surface interaction between the column and the surrounding soil and the effect of material properties on this phenomena. A design tools was developed. The simulation included column geometry (i.e. diameter and length), and soil and column properties as a parametric study to improve the performance of the foundation system.

Download or read book DEM Study of a Single Stone Column in a Clayey Stratum written by Anibal Enrique Santos Marin and published by . This book was released on 2017 with total page 96 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aggregate piers are an alternative ground improvement technique used for improving the bearing capacity and reducing the total and differential settlement of foundations supported on compressible soils. The piers are composed of a series of vibrationally compacted aggregate lifts from a desired depth up to the finished foundation level. The shear strength of the coarse-grained material comprising an aggregate pier is defined by its internal friction angle. There are several factors affecting the friction angle of the granular material that include: confining stress, particle shape, relative density and particle distribution (gradation). These factors are not directly considered in the design of aggregate columns. However, because the granular material friction angle is a fundamental design parameter used to estimate the bearing capacity of aggregate piers, these factors could play an important role in the mechanical behavior of isolated aggregate columns. Other factors responsible for altering the global performance of aggregate piers are column length and the undrained shear strength of the matrix soil. Full-scale 3D discrete element method (DEM) simulations were conducted to reproduce field plate load tests performed on small circular foundation resting on single aggregate piers in order to evaluate the effects of these factors on the global performance of aggregate columns. The numerical results demonstrate that incorporating the gradation, confining stress and relative density dependence of the aggregate friction angle in the DEM models provides better numerical estimation of the load-displacement curves observed in the field for both the foundation serviceability level and the ultimate load condition. The effects of column length on the load-displacement response are found to be a minimum for column slenderness ratios greater than four.

Download or read book Analytical Methods in Petroleum Upstream Applications written by Cesar Ovalles and published by CRC Press. This book was released on 2015-04-02 with total page 1351 pages. Available in PDF, EPUB and Kindle. Book excerpt: Effective measurement of the composition and properties of petroleum is essential for its exploration, production, and refining; however, new technologies and methodologies are not adequately documented in much of the current literature. Analytical Methods in Petroleum Upstream Applications explores advances in the analytical methods and instrumentation that allow more accurate determination of the components, classes of compounds, properties, and features of petroleum and its fractions. Recognized experts explore a host of topics, including: A petroleum molecular composition continuity model as a context for other analytical measurements A modern modular sampling system for use in the lab or the process area to collect and control samples for subsequent analysis The importance of oil-in-water measurements and monitoring The chemical and physical properties of heavy oils, their fractions, and products from their upgrading Analytical measurements using gas chromatography and nuclear magnetic resonance (NMR) applications Asphaltene and heavy ends analysis Chemometrics and modeling approaches for understanding petroleum composition and properties to improve upstream, midstream, and downstream operations Due to the renaissance of gas and oil production in North America, interest has grown in analytical methods for a wide range of applications. The understanding provided in this text is designed to help chemists, geologists, and chemical and petroleum engineers make more accurate estimates of the crude value to specific refinery configurations, providing insight into optimum development and extraction schemes.

Download or read book The Combined Finite Discrete Element Method written by Antonio A. Munjiza and published by John Wiley & Sons. This book was released on 2004-04-21 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt: The combined finite discrete element method is a relatively new computational tool aimed at problems involving static and / or dynamic behaviour of systems involving a large number of solid deformable bodies. Such problems include fragmentation using explosives (e.g rock blasting), impacts, demolition (collapsing buildings), blast loads, digging and loading processes, and powder technology. The combined finite-discrete element method - a natural extension of both discrete and finite element methods - allows researchers to model problems involving the deformability of either one solid body, a large number of bodies, or a solid body which fragments (e.g. in rock blasting applications a more or less intact rock mass is transformed into a pile of solid rock fragments of different sizes, which interact with each other). The topic is gaining in importance, and is at the forefront of some of the current efforts in computational modeling of the failure of solids. * Accompanying source codes plus input and output files available on the Internet * Important applications such as mining engineering, rock blasting and petroleum engineering * Includes practical examples of applications areas Essential reading for postgraduates, researchers and software engineers working in mechanical engineering.

Download or read book Numerical Modelling of Foundations Stabilised by Stone Columns written by Helmut F. Schweiger and published by . This book was released on 1984 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Computational Science ICCS 2007 written by Yong Shi and published by Springer. This book was released on 2007-07-14 with total page 1294 pages. Available in PDF, EPUB and Kindle. Book excerpt: Part of a four-volume set, this book constitutes the refereed proceedings of the 7th International Conference on Computational Science, ICCS 2007, held in Beijing, China in May 2007. The papers cover a large volume of topics in computational science and related areas, from multiscale physics to wireless networks, and from graph theory to tools for program development.

Download or read book The Deep Mixing Method written by Masaki Kitazume and published by CRC Press. This book was released on 2013-02-21 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Deep Mixing Method (DMM), a deep in-situ soil stabilization technique using cement and/or lime as a stabilizing agent, was developed in Japan and in the Nordic countries independently in the 1970s. Numerous research efforts have been made in these areas investigating properties of treated soil, behavior of DMM improved ground under static and d

Download or read book Geosynthetics in Civil and Environmental Engineering written by Guang-xin Li and published by Springer Science & Business Media. This book was released on 2009-03-07 with total page 875 pages. Available in PDF, EPUB and Kindle. Book excerpt: Geosynthetics in Civil and Environmental Engineering presents contributions from the 4th Asian Regional Conference on Geosynthetics held in Shanghai, China. The book covers a broad range of topics, such as: fundamental principles and properties of geosynthetics, testing and standards, reinforcement, soil improvement and ground improvement, filter and drainage, landfill engineering, geosystem, transport, geosynthetics-pile support system and geocell, hydraulic application, and ecological techniques. Special case studies as well as selected government-sponsored projects such as the Three Gorges Dam, Qinghai-Tibet Railway, and Changi Land reclamation project are also discussed. The book will be an invaluable reference in this field.

Download or read book Modeling in Geotechnical Engineering written by Pijush Samui and published by Academic Press. This book was released on 2020-12-01 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: Modeling in Geotechnical Engineering is a one stop reference for a range of computational models, the theory explaining how they work, and case studies describing how to apply them. Drawing on the expertise of contributors from a range of disciplines including geomechanics, optimization, and computational engineering, this book provides an interdisciplinary guide to this subject which is suitable for readers from a range of backgrounds. Before tackling the computational approaches, a theoretical understanding of the physical systems is provided that helps readers to fully grasp the significance of the numerical methods. The various models are presented in detail, and advice is provided on how to select the correct model for your application. - Provides detailed descriptions of different computational modelling methods for geotechnical applications, including the finite element method, the finite difference method, and the boundary element method - Gives readers the latest advice on the use of big data analytics and artificial intelligence in geotechnical engineering - Includes case studies to help readers apply the methods described in their own work

Download or read book Linear and Non linear Numerical Analysis of Foundations written by John W. Bull and published by CRC Press. This book was released on 2009-02-02 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Correctly understanding, designing and analyzing the foundations that support structures is fundamental to their safety. This book by a range of academic, design and contracting world experts provides a review of the state-of-the-art techniques for modelling foundations using both linear and non linear numerical analysis. It applies to a range of infrastructure, civil engineering and structural engineering projects and allows designers, engineers, architects, researchers and clients to understand some of the advanced numerical techniques used in the analysis and design of foundations. Topics include: Ground vibrations caused by trains Pile-group effects Bearing capacity of shallow foundations under static and seismic conditions Bucket foundation technology for offshore oilfields Seismically induced liquefaction in earth embankment foundations and in pile foundations Free vibrations of industrial chimneys and TV towers with flexibility of the soil Settlements of high rise structures Seepage, stress fields and dynamic responses in dams Site investigation

Download or read book Foundation Design Principles and Practices written by Donald P. Coduto and published by Pearson Higher Ed. This book was released on 2013-10-03 with total page 889 pages. Available in PDF, EPUB and Kindle. Book excerpt: For undergraduate/graduate-level foundation engineering courses. Covers the subject matter thoroughly and systematically, while being easy to read. Emphasizes a thorough understanding of concepts and terms before proceeding with analysis and design, and carefully integrates the principles of foundation engineering with their application to practical design problems.

Download or read book Numerical Methods in Geotechnical Engineering IX written by António S. Cardoso and published by CRC Press. This book was released on 2018-06-19 with total page 2430 pages. Available in PDF, EPUB and Kindle. Book excerpt: Numerical Methods in Geotechnical Engineering IX contains 204 technical and scientific papers presented at the 9th European Conference on Numerical Methods in Geotechnical Engineering (NUMGE2018, Porto, Portugal, 25—27 June 2018). The papers cover a wide range of topics in the field of computational geotechnics, providing an overview of recent developments on scientific achievements, innovations and engineering applications related to or employing numerical methods. They deal with subjects from emerging research to engineering practice, and are grouped under the following themes: Constitutive modelling and numerical implementation Finite element, discrete element and other numerical methods. Coupling of diverse methods Reliability and probability analysis Large deformation – large strain analysis Artificial intelligence and neural networks Ground flow, thermal and coupled analysis Earthquake engineering, soil dynamics and soil-structure interactions Rock mechanics Application of numerical methods in the context of the Eurocodes Shallow and deep foundations Slopes and cuts Supported excavations and retaining walls Embankments and dams Tunnels and caverns (and pipelines) Ground improvement and reinforcement Offshore geotechnical engineering Propagation of vibrations Following the objectives of previous eight thematic conferences, (1986 Stuttgart, Germany; 1990 Santander, Spain; 1994 Manchester, United Kingdom; 1998 Udine, Italy; 2002 Paris, France; 2006 Graz, Austria; 2010 Trondheim, Norway; 2014 Delft, The Netherlands), Numerical Methods in Geotechnical Engineering IX updates the state-of-the-art regarding the application of numerical methods in geotechnics, both in a scientific perspective and in what concerns its application for solving practical boundary value problems. The book will be much of interest to engineers, academics and professionals involved or interested in Geotechnical Engineering.

Download or read book Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions written by Francesco Silvestri and published by CRC Press. This book was released on 2019-07-19 with total page 8083 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions contains invited, keynote and theme lectures and regular papers presented at the 7th International Conference on Earthquake Geotechnical Engineering (Rome, Italy, 17-20 June 2019. The contributions deal with recent developments and advancements as well as case histories, field monitoring, experimental characterization, physical and analytical modelling, and applications related to the variety of environmental phenomena induced by earthquakes in soils and their effects on engineered systems interacting with them. The book is divided in the sections below: Invited papers Keynote papers Theme lectures Special Session on Large Scale Testing Special Session on Liquefact Projects Special Session on Lessons learned from recent earthquakes Special Session on the Central Italy earthquake Regular papers Earthquake Geotechnical Engineering for Protection and Development of Environment and Constructions provides a significant up-to-date collection of recent experiences and developments, and aims at engineers, geologists and seismologists, consultants, public and private contractors, local national and international authorities, and to all those involved in research and practice related to Earthquake Geotechnical Engineering.

Download or read book Tall Building Foundation Design written by Harry G. Poulos and published by CRC Press. This book was released on 2017-07-20 with total page 761 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive guide to the design of foundations for tall buildings. After a general review of the characteristics of tall buildings, various foundation options are discussed followed by the general principles of foundation design as applied to tall buildings. Considerable attention is paid to the methods of assessment of the geotechnical design parameters, as this is a critical component of the design process. A detailed treatment is then given to foundation design for various conditions, including ultimate stability, serviceability, ground movements, dynamic loadings and seismic loadings. Basement wall design is also addressed. The last part of the book deals with pile load testing and foundation performance measurement, and finally, the description of a number of case histories. A feature of the book is the emphasis it places on the various stages of foundation design: preliminary, detailed and final, and the presentation of a number of relevant methods of design associated with each stage.

Download or read book Principles and Practice of Ground Improvement written by Jie Han and published by John Wiley & Sons. This book was released on 2015-06-22 with total page 432 pages. Available in PDF, EPUB and Kindle. Book excerpt: Gain a stronger foundation with optimal ground improvement Before you break ground on a new structure, you need to analyze the structure of the ground. Expert analysis and optimization of the geo-materials on your site can mean the difference between a lasting structure and a school in a sinkhole. Sometimes problematic geology is expected because of the location, but other times it's only unearthed once construction has begun. You need to be able to quickly adapt your project plan to include an improvement to unfavorable ground before the project can safely continue. Principles and Practice of Ground Improvement is the only comprehensive, up-to-date compendium of solutions to this critical aspect of civil engineering. Dr. Jie Han, registered Professional Engineer and preeminent voice in geotechnical engineering, is the ultimate guide to the methods and best practices of ground improvement. Han walks you through various ground improvement solutions and provides theoretical and practical advice for determining which technique fits each situation. Follow examples to find solutions to complex problems Complete homework problems to tackle issues that present themselves in the field Study design procedures for each technique to simplify field implementation Brush up on modern ground improvement technologies to keep abreast of all available options Principles and Practice of Ground Improvement can be used as a textbook, and includes Powerpoint slides for instructors. It's also a handy field reference for contractors and installers who actually implement plans. There are many ground improvement solutions out there, but there is no single right answer to every situation. Principles and Practice of Ground Improvement will give you the information you need to analyze the problem, then design and implement the best possible solution.