Towards A Unified Soil Mechanics Theory
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Towards A Unified Soil Mechanics Theory The Use Of Effective Stresses In Unsaturated Soils Revised Edition
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Author : Eduardo Rojas
language : en
Publisher: Bentham Science Publishers
Release Date : 2018-08-08
Towards A Unified Soil Mechanics Theory The Use Of Effective Stresses In Unsaturated Soils Revised Edition written by Eduardo Rojas and has been published by Bentham Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-08 with Technology & Engineering categories.
With the application of the effective stress concept, the strength and volumetric behavior of saturated materials was clearly understood. For the case of unsaturated materials, a universally accepted effective stresses equation is still under debate. However, the use of the effective stress concept to develop constitutive models for unsaturated soils is becoming increasingly popular not only because the hydro-mechanical coupling observed in these materials is implicit in the formulation but also because simpler and more precise models can be established. Towards A Unified Soil Mechanics Theory demonstrates that the same strength and volume change equations used in saturated soil mechanics can be used for the case of unsaturated soils. In other words, the constitutive models developed for saturated soils can be used for unsaturated materials once the effective stress equation has been defined. In this book, an analytical equation for the effective stress for unsaturated soils is established. This equation requires the knowledge of the superficial area of solids affected by the capillary phenomenon. In other words, we need to know how water distributes in the pores of the soil. This distribution can be modeled using a solid-porous model built on a regular network. However, the size of the network required to correctly simulate the structure of a small soil sample cannot be managed with a common PC. For that reason, a probabilistic porous-solid model is developed. This model uses the pore size distribution in the form of a probabilistic function which in addition to the Laplace equation and the principle of continuity can be expressed as the probability of a pore of certain size to be filled or dry at suction during a wetting or drying path, respectively. In this way, the soil-water retention curves can be simulated and the effective stress at any suction during wetting or drying processes can be determined. Based on this approach, it is shown that unsaturated soils behave under the same principles for strength and volumetric behavior as saturated soils. This revised edition brings additional information about an elastoplastic framework for expansive soils, hydro-mechanical coupling and a fully coupled model. The additional chapters also cover the experimental parameters used to derive the models. An updated set of references and a list of abbreviations is also included in this edition. Towards A Unified Soil Mechanics Theory paves the way for a universal theory of soil mechanics. The volume will be a valuable reference to civil engineers, earth scientists and hydrologists interested in soil mechanics at both academic and professional levels.
Towards A Unified Soil Mechanics Theory The Use Of Effective Stresses In Unsaturated Soils Third Edition
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Author : Eduardo Rojas
language : en
Publisher: Bentham Science Publishers
Release Date : 2022-10-11
Towards A Unified Soil Mechanics Theory The Use Of Effective Stresses In Unsaturated Soils Third Edition written by Eduardo Rojas and has been published by Bentham Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2022-10-11 with Technology & Engineering categories.
Towards A Unified Soil Mechanics Theory demonstrates mathematical models for saturated and unsaturated soils by defining the effective stress equation. Chapters present hydraulic models that simulate water distribution in pores. Parameters from these models are then used to demonstrate the use of an effective stress equation to understand the mechanics of soils that have different material constitutions. Key Features: -Sequentially explains soil modeling techniques for easy understanding -Demonstrates the use of an effective stress equation based on data from porous-solid models. -Explains how porous-solid models can simulate the soilwater retention curves of materials. -Establishes an elastoplastic framework for the volumetric behavior of unsaturated soils that is used to simulate the phenomenon of collapse upon wetting and the behavior of expansive soils. -Explains the practical application of fully a coupled hydro-mechanical (critical state) soil model -Includes scientific references for further reading The third edition includes additional information on retention curves in deforming curves, the application of a coupled hydro-mechanical model simulating undrained tests and the behavior of soils during static compaction, and the use of a porous-solid model to develop a fully analytical equation for the relative hydraulic conductivity of soils. The new chapters also cover the experimental parameters used to derive the models. This edition also updates material from previous editions, and adds new scientific references. Towards A Unified Soil Mechanics Theory paves the way for a universal theory of soil mechanics that has a wide range of applications. The book is a valuable reference to civil engineers, geotechnical engineers, earth scientists and hydrologists interested in soil mechanics at both academic and professional levels.
Towards A Unified Soil Mechanics Theory
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Author : Eduardo Rojas
language : en
Publisher:
Release Date : 2013
Towards A Unified Soil Mechanics Theory written by Eduardo Rojas 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.
Soil Mechanics
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Author : Mao-Hong Yu
language : en
Publisher: Springer Nature
Release Date : 2023-07-01
Soil Mechanics written by Mao-Hong Yu and has been published by Springer Nature this book supported file pdf, txt, epub, kindle and other format this book has been release on 2023-07-01 with Technology & Engineering categories.
This book focuses on the unified solutions and analysis for the problems in soil mechanics based on the unified strength theory, which is a new theory on the yield and failure of materials under multi-axial stresses. Then, it provides a system of yield and failure criteria adopted for most materials, from metallic materials to rocks, concretes, soils, polymers, etc. It includes the Tresca criterion, Mohr–Coulomb theory, and Mises criterion as well, which are special cases or linear approximation of the UST.
Soil Mechanics Fundamentals
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Author : Isao Ishibashi
language : en
Publisher: CRC Press
Release Date : 2010-12-14
Soil Mechanics Fundamentals written by Isao Ishibashi and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-12-14 with Technology & Engineering categories.
While many introductory texts on soil mechanics are available, most are either lacking in their explanations of soil behavior or provide far too much information without cogent organization. More significantly, few of those texts go beyond memorization of equations and numbers to provide a practical understanding of why and how soil mechanics work. Based on the authors’ more than 25 years of teaching soil mechanics to engineering students, Soil Mechanics Fundamentals presents a comprehensive introduction to soil mechanics, with emphasis on the engineering significance of what soil is, how it behaves, and why it behaves that way. Concise, yet thorough, the text is organized incrementally, with earlier sections serving as the foundation for more advanced topics. Explaining the varied behavior of soils through mathematics, physics and chemistry, the text covers: Engineering behavior of clays Unified and AASHTO soil classification systems Compaction techniques, water flow and effective stress Stress increments in soil mass and settlement problems Mohr’s Circle application to soil mechanics and shear strength Lateral earth pressure and bearing capacity theories Each chapter is accompanied by example and practicing problems that encourage readers to apply learned concepts to applications with a full understanding of soil behavior fundamentals. With this text, engineering professionals as well as students can confidently determine logical and innovative solutions to challenging situations.
Soil Mechanics Fundamentals And Applications Second Edition
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Author : Isao Ishibashi
language : en
Publisher: CRC Press
Release Date : 2015-03-24
Soil Mechanics Fundamentals And Applications Second Edition written by Isao Ishibashi and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015-03-24 with Technology & Engineering categories.
How Does Soil Behave and Why Does It Behave That Way? Soil Mechanics Fundamentals and Applications, Second Edition effectively explores the nature of soil, explains the principles of soil mechanics, and examines soil as an engineering material. This latest edition includes all the fundamental concepts of soil mechanics, as well as an introduction to foundation engineering, including coverage of site exploration, shallow and deep foundation design, and slope stability. It presents the material in a systematic, step-by-step manner, and contains numerous problems, examples, and solutions. New to the Second Edition: The revised text expands the contents to include an introductory foundation engineering section to make the book cover the full range of geotechnical engineering. The book includes three new chapters: Site Exploration, Deep Foundations, and Slope Stability. This text: Provides an introductory chapter on soil mechanics Explores the origin and description of soils and discusses soil shapes and gradations Presents the unique characteristics of clays Details soil classifications by the Unified Soil Classification System (also ASTM) and by the American Association of State Highway and Transportation Officials (AASHTO) Highlights laboratory and field compaction techniques, including field specification and density testing,, and the CBR (California Bearing Ratio) method Discusses the flow of water through soils, defining hydraulic heads, as well as the two-dimensional flow net technique and a systematic approach to compute boundary water pressures Examines the concept of effective stress and its applications to various soil mechanics problems Explores stress increments in a soil mass due to various types of footing load on the ground Presents Terzaghi’s one-dimensional consolidation theory and its applications Covers Mohr’s circle from geotechnical perspectives with use of the pole, which is utilized in chapters relating to shear strength and lateral earth pressure Addresses the shear strength of soils, failure criteria, and laboratory as well as field shear strength determination techniques Evaluates at-rest earth pressure and the classic Rankine and Coulomb active and passive pressure theories and present critical review of those methods Reviews introductory foundation engineering and site exploration Describes the bearing capacity theory and, as an application, the shallow foundation design procedure Covers deep and shallow foundation design procedures Explains slope stability problems and remediation procedures, and more Soil Mechanics Fundamentals and Applications, Second Edition is a concise and thorough text that explains soil’s fundamental behavior and its applications to foundation designs and slope stability problems and incorporates basic engineering science knowledge with engineering practices and practical applications.
The Unified Soil Classification System
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Author : Waterways Experiment Station (U.S.)
language : en
Publisher:
Release Date : 1953
The Unified Soil Classification System written by Waterways Experiment Station (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1953 with Foundations categories.
Soil Mechanics In The Light Of Critical State Theories
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Author : J.A.R. Ortigao
language : en
Publisher: CRC Press
Release Date : 2020-08-13
Soil Mechanics In The Light Of Critical State Theories written by J.A.R. Ortigao and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-08-13 with Science categories.
This work reviews soil mechanics in the light of critical state soil mechanics. A number of exercises are provided, and a microcomputer program, "Cris", used for simulation of the behaviour of soil samples subjected to triaxial tests through the critical state models, accompanies the text.
Theoretical Soil Mechanics
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Author : Karl Terzaghi
language : en
Publisher:
Release Date : 1963
Theoretical Soil Mechanics written by Karl Terzaghi and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1963 with Soils categories.
Effective Stress And Equilibrium Equation For Soil Mechanics
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Author : Longtan Shao
language : en
Publisher: CRC Press
Release Date : 2017-12-06
Effective Stress And Equilibrium Equation For Soil Mechanics written by Longtan Shao and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-12-06 with Technology & Engineering categories.
The concept of effective stress and the effective stress equation is fundamental for establishing the theory of strength and the relationship of stress and strain in soil mechanics and poromechanics. However, up till now, the physical meaning of effective stress has not been explained clearly, and the theoretical basis of the effective stress equation has not been proposed. Researchers have not yet reached a common understanding of the feasibility of the concept of effective stress and effective stress equation for unsaturated soils. Effective Stress and Equilibrium Equation for Soil Mechanics discusses the definition of the soil skeleton at first and clarifies that the soil skeleton should include a fraction of pore water. When a free body of soil skeleton is taken to conduct internal force analysis, the stress on the surface of the free body has two parts: one is induced by pore fluid pressure that only includes normal stress; the other is produced by all the other external forces excluding pore fluid pressure. If the effective stress is defined as the soil skeleton stress due to all the external forces excluding pore fluid pressure, the effective stress equation can be easily obtained by the internal force equilibrium analysis. This equation reflects the relationship between the effective stress, total stress and pore fluid pressure, which does not change with the soil property. The effective stress equation of saturated soils and unsaturated soils is unified, i.e., o ̃=o ̃t –Seuw–(1–Se)ua. For multiphase porous medium, o ̃=o ̃t –u*,u*=Seiui(i=1,2,...,M). In this book, a theoretical formula of the coefficient of permeability for unsaturated soils is derived. The formula of the seepage force is modified based on the equilibrium differential equation of the pore water. The relationship between the effective stress and the shear strength and deformation of unsaturated soils is preliminarily verified. Finally, some possibly controversial problems are discussed to provide a better understanding of the role of the equilibrium equation and the concept of effective stress.