Download or read book Study on the stress strain strengh behaviour of a saturated biotite gnaisse residual soil written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: O presente trabalho consiste num estudo experimental de laboratório, no qual procurou-se analisar o comportamento tensão-deformação-resistência de um solo residual jovem de biotita gnaisse na condição saturada. Foram realizados ensaios de compressão isotrópica e edométrico através dos quais foi definida a tensão de pré-adensamento do solo em estudo. Posteriormente foram realizados ensaios triaxiais de compressão e extensão seguindo diferentes trajetórias de tensão, com autilização de instrumentação interna (ELETRONÍVEIS) para medição das deformações axiais. A utilização dos ELETRONÍVEIS possibilitou a identificação de uma superfície de escoamento no espaço de tensões de compressão e de extensão. Foi analisado o módulo secante de deformabilidade obtido com o uso do LSCDT e dos ELETRONÍVEIS a partir dos ensaios triaxiais. O estudo microestrutural do solo feito através de lâminas delgadas, analisadas ao microscópio óptico e eletrônico de varredura, possibilitou a verificação de cimentação entre os grãos do solo. Esta é causada pela cimentação do ferro liberado através da intemperização dos minerais de granada e biotita.
Download or read book Stress strain behavior of a gneiss residual soil using the cubic triaxial cell written by and published by . This book was released on 1912 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: O conhecimento do comportamento de solos residuais é de grande importância para projetos geotécnicos no Brasil e, em particular, na região do Rio de Janeiro, tendo em vista que o clima tropical e as características geológicas favorecem a ocorrência de mantos residuais de grande espessura. O presente trabalho trata do estudo do comportamento tensão-deformação de um solo residual proveniente de um perfil de alteração de rocha gnáissica do maciço da Tijuca, Rio de Janeiro. Como os solos residuais gnáissicos preservam as foliações herdadas da rocha matriz, investigou-se em particular a relevância de se considerar a ocorrência de anisotropia nas características de resistência e deformabilidade destes solos. No estudo foi utilizado o equipamento triaxial cúbico desenvolvido na PUC-Rio. Este equipamento possibilita o controle independente das três tensões principais, sendo mais adequado para a reprodução das trajetórias de tensões tridimensionais, usualmente associadas com obras geotécnicas no campo, e em particular, para estudos sobre as características de anisotropia de solos. O programa experimental constou de ensaios de compressão axial e hidrostática, sob condições drenadas de carregamento, utilizando o equipamento triaxial cúbico. Foram realizados também ensaios oedométricos convencionais, de modo a se obter as características de compressibilidade do solo. Foram moldados corpos de prova a partir de blocos indeformados, paralelos e perpendiculares à foliação observada no solo, o que possibilitou a análise dos resultados para direções distintas de carregamento. Para efeito de comparação sobre a relevância do arranjo estrutural dos grãos do solo, foram ensaiados também corpos de prova compactados dos mesmos materiais. A análise dos resultados permitiu a obtenção dos módulos de deformabilidade e dos parâmetros de resistência do solo residual. Em particular, foram verificados os efeitos da direção de carregamento dos corpos de prova, do nível das tensões de confinamento, do grau de intemperismo, do arranjo estrutural dos grãos e dos efeitos do grau de saturação. Pode-se concluir que os solos estudados não apresentaram efeitos marcantes de anisotropia nas características de resistência. No entanto, quanto à deformabilidade, pode-se considerar que o solo residual jovem apresentou características anisotrópicas.
Download or read book Geology and Genesis of Major Copper Deposits and Districts of the World written by Society of economic geologists and published by . This book was released on 2012 with total page 618 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil and Water Chemistry written by Michael E. Essington and published by CRC Press. This book was released on 2015-04-24 with total page 658 pages. Available in PDF, EPUB and Kindle. Book excerpt: The second edition of a bestseller, Soil and Water Chemistry: An Integrative Approach maintains the balanced perspective that made the first edition a hugely popular textbook. The second edition includes new figures and tables, new chapters, and expanded exercises in each chapter. It covers topics including soil chemical environment, soil minerals,
Download or read book Introduction to Rational Elasticity written by Chao-cheng Wang and published by Springer Science & Business Media. This book was released on 1973-12-31 with total page 578 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Soil Fauna Assemblages written by Uffe N. Nielsen and published by Cambridge University Press. This book was released on 2019-03-28 with total page 381 pages. Available in PDF, EPUB and Kindle. Book excerpt: A holistic overview of soil fauna, their contributions to ecosystem function, and implications of global change belowground.
Download or read book Engineering Geology and the Environment written by Paul G. Marinos and published by CRC Press. This book was released on 1997 with total page 346 pages. Available in PDF, EPUB and Kindle. Book excerpt: This fourth volume of five from the June 1997 conference was much delayed (the first four volumes were published in 1997). It comprises 23 special lectures solicited for the conference on various aspects of problematic soils, natural and man-made hazards, urban and regional planning, waste disposal, mines and quarries, large engineering works, and protection of geological, geographical, historical, and architectural heritage. There is no subject index. Annotation copyrighted by Book News Inc., Portland, OR
Download or read book Compression and Consolidation of Clayey Soils written by Hiroshi Yoshikuni and published by . This book was released on 1995 with total page 1116 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Elements of Continuum Mechanics written by C. Truesdell and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 284 pages. Available in PDF, EPUB and Kindle. Book excerpt: The lectures here reported were first delivered in August and September, 1965, for the Department of Mechanical and Aerospace Engi neering at syracuse University, New York under the sponsorship of the New York State Science and Technology Foundation. Lectures 1-6 and 22-23 are revised from a version prepared by Professor Kin N. Tong on the basis of a transcription of the lectures, kindly provided by Professor S. Eskinazi. The remainder of th~ text has been written out afresh from my own notes. Much of the same ground was covered in my lectures to the Austra lian Mathematical Society's Summer Research Institute at Melbourne in January and February, 1966, and for the parts affected the text conforms to this latter presentation. I am grateful to Professors C.-C. Wang and K. N. Tong for criticism of the manuscript. These lectures constitute a course, not a treatise. Names are attached to theorems justly, to the best of my knowledge, but are not intended to replace a history of the subject or references to the sources.
Download or read book Constitutive Equations in Viscoplasticity written by American Society of Mechanical Engineers and published by . This book was released on 1976 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Resources Use Efficiency in Agriculture written by Sandeep Kumar and published by Springer Nature. This book was released on 2020-09-18 with total page 762 pages. Available in PDF, EPUB and Kindle. Book excerpt: Achieving zero hunger and food security is a top priority in the United Nations Development Goals (UNDGs). In an era characterized by high population growth and increasing pressure on agricultural systems, efficiency in the use of natural resources has become central to sustainable agricultural practices. Fundamentally speaking, eco-efficiency is about maximizing agricultural outputs, in terms of quantity and quality, using less land, water, nutrients, energy, labor, or capital. The concept of eco-efficiency involves both the ecological and economic aspects of sustainable agriculture. It is therefore essential to understand the interaction of ecosystem constituents within the extensive agricultural landscape, as well as farmers’ economic needs. This book examines the latest eco-efficient practices used in agro-systems. Drawing upon research and examples from around the world, it offers an up-to-date overview, together with insights into directly applicable approaches for poly-cropping systems and landscape-scale management to improve the stability of agricultural production systems, helping achieve food security. The book will be of interest to educators, researchers, climate change scientists, capacity builders and policymakers alike. It can also be used as additional reading material for undergraduate and graduate courses on agriculture, forestry, soil science, and the environmental sciences.
Download or read book Mesozoic Stratigraphy of India written by Santanu Banerjee and published by Springer Nature. This book was released on 2021-08-02 with total page 727 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book envisages a multi-proxy approach using stable isotopes, geochemical proxies, magnetic susceptibility and associated biotic events for paleoclimatic and paleoenvironmental interpretations of the Mesozoic sedimentary record of India. Mesozoic rocks of India record abnormal sea level rise, greenhouse climate, intensified volcanism, hypoxia in seawater, extensive black shale deposition, and hydrocarbon occurrence. The Mesozoic has also witnessed mass extinction events, evolution of dinosaurs, and breakdown of the supercontinent Pangea and the formation of Gondwana. Although the Mesozoic geology of India has witnessed significant progress in the last century, literature survey reveals a huge gap in knowledge regarding sequence stratigraphy, chemostratigraphy and key geological events. A synthesis of sedimentological, paleontological and chemical data is included to presenting a comprehensive understanding of the Indian Mesozoic record to students, researchers and professionals.
