Download or read book Back Calculated Soil Water Characteristic Curve From Fluid Flow Data written by Amin Y. Pasha and published by . This book was released on 2013 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The soil-water characteristic curve (SWCC) is a fundamental property of an unsaturated soil that is used to predict multiphase flow and transport through porous media. Direct measurement of the SWCC using conventional testing devices is time consuming. A methodology with which to estimate the SWCC is proposed in this paper based on the recorded data of transient fluid flow into soil during a 50 g centrifugal test. An inverse analysis was performed to fit the numerical simulation results, obtained using a finite element multiphase flow code NAPL simulator, to the centrifugal model test data. For the numerical simulations, several sets of representative SWCC parameters of the modeled soil were assumed. Based on an optimization scheme, the parameters that produced the best match between measured and simulated data were selected, and the SWCC for the soil was predicted. To validate the proposed method, the predicted SWCC was compared with that obtained via a conventional test. The comparison showed that the SWCC obtained via inverse analysis with a van Genuchten model parameter set of ? = 0.4 m-1 and ? = 3 compared relatively well to the measured one. Thus this new method, based on inverse analysis of the fluid flow data from centrifugal modeling, could be used as a reliable, indirect technique for predicting field SWCCs.
Download or read book Proceedings of the 8th International Congress on Environmental Geotechnics Volume 1 written by Liangtong Zhan and published by Springer. This book was released on 2018-10-10 with total page 911 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gathers selected papers presented at the 8th International Congress on Environmental Geotechnics (ICEG), held on October 28 - November 1, 2018 in Hangzhou, China. The theme of the congress is “Towards a Sustainable Geoenvironment”, which means meeting the needs of the present generation without compromising the ability of future generations to meet their own needs. Under this theme, the congress covers a broad range of topics and provides an excellent opportunity for academics, engineers, scientists, government officials, regulators, and planners to present, discuss and exchange notes on the latest advances and developments in the research and application of environmental geotechnics.
Download or read book Constant Flow Method for Determining the Soil Water Characteristic Curve and Unsaturated Hydraulic Conductivity Function of Granular Soils written by Alexandra Wayllace and published by . This book was released on 2004 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unsaturated Soil Mechanics with Probability and Statistics written by Ryosuke Kitamura and published by CRC Press. This book was released on 2019-08-09 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil is fundamentally a multi-phase material – consisting of solid particles, water and air. In soil mechanics and geotechnical engineering it is widely treated as an elastic, elastoplastic or visco-elastoplastic material, and consequently regarded as a continuum body. However, this book explores an alternative approach, considering soil as a multi-phase and discrete material and applying basic Newtonian mechanics rather than analytical mechanics. It applies microscopic models to the solid phase and fluid phases, and then introduces probability theory and statistics to derive average physical quantities which correspond to the soil‘s macroscopic physical properties such as void ratio and water content. This book is particularly focused on the mechanical behaviour of dry, partially saturated and full saturated sandy soil, as much of the physicochemical microscopic characteristic of clayey soil is still not clear. It explores the inter-particle forces at the point of contact of soil particles and the resultant inter-particle stresses, instead of the total stress and effective stress which are studied in mainstream soil mechanics. Deformation and strength behaviour, soil-water characteristic curves, and permeability coefficients of water and air are then derived simply from grain size distribution, soil particle density, void ratio and water content. A useful reference for consultants, professional engineers, researchers and public sector organisations involved in unsaturated soil tests. Advanced undergraduate and postgraduate students on Unsaturated Soil Mechanics courses will also find it a valuable text to study.
Download or read book A New Method for Soil Water Characteristic Curve Measurement Based on Similarities Between Soil Freezing and Drying written by Zhen Liu and published by . This book was released on 2012 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The soil water characteristic curve (SWCC) is the basis to explain a variety of processes in unsaturated soils, ranging from transport phenomena to mechanical behaviors. In this paper, a new method is developed for SWCC estimation based on the similarity between the freezing/thawing process and drying/wetting process in soils. The theoretical basis for this method is first reviewed. The concept of the soil freezing characteristic curve (SFCC) is introduced to describe the relationship between the unfrozen water content and matric suction in frozen soils. SFCC is analogous to SWCC in that both of them describe the energy status of liquid water associated with liquid water content. Relationships between SWCC and SFCC are discussed. To measure the SFCC, a thermo-time domain reflectometry (TDR) sensor was developed which combines both temperature sensors and conventional TDR sensor. The TDR module and algorithm measured the bulk free water content of soils during the freezing/thawing processes, while the built-in thermocouples measured the internal temperature distribution. SFCCs were obtained from the simultaneously measured TDR and temperature data. Experiments were conducted on a few types of soils to validate this new procedure. The SFCC was obtained from thermo-TDR data collected in specimens subjected to a controlled thawing process, while the SWCC was directly measured by ASTM D5298, the filter paper method. Reasonable agreements were found between SWCC and SFCC. The experimental results implied that the SWCC could be estimated from SFCC, which also provided more evidence of the similarity of freezing/thawing processes and desorption/sorption processes.
Download or read book Unsaturated Soils for Asia written by H. Raharjdo and published by CRC Press. This book was released on 2020-09-10 with total page 878 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a collection of articles from the Asian conference UNSAT-ASIA 2000, covering topics such as: historical developments; numerical modelling; suction measurement techniques; permeability and flow; mass transport; and engineering applications.
Download or read book Advanced Unsaturated Soil Mechanics and Engineering written by Charles Wang Wai Ng and published by CRC Press. This book was released on 2014-04-21 with total page 711 pages. Available in PDF, EPUB and Kindle. Book excerpt: Analytical and comprehensive, this state-of-the-art book, examines the mechanics and engineering of unsaturated soils, as well as explaining the laboratory and field testing and research that are the logical basis of this modern approach to safe construction in these hazardous geomaterials; putting them into a logical framework for civil engineerin
Download or read book A New Experimental Method for Measuring Water Characteristic Curves of Soils written by Gholamreza Rakhshandehroo and published by . This book was released on 1992 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Geotechnical Engineering written by Ken K. S. Ho and published by CRC Press. This book was released on 2001 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Determination of Diffusion Coefficient Through Laboratory Tests and Analytically Validating it Using Empirical Relations for Unsaturated Soils written by Anshuman B. Thakur and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Soil suction is one of the most important physical variables affecting the soil engineering behavior, moisture content. Suction has a major controlling influence on soil shear strength. The moisture diffusivity properties of unsaturated properties of soils exert a critical influence on the depth to which seasonal variations of moisture and suction at the ground surface extend into the soil mass. Hence, a study of moisture diffusion coefficient is pivotal. In this research the drying test originally proposed by Mitchell (1979) has been validated by back calculating the moisture diffusion values using the empirical relation established by Lytton (2003). The non-linear flow through unsaturated soils has been simplified to a linear problem for simplicity in this study. Owing to this simplification, certain refinements have therefore been applied in the determination of diffusion coefficient. Thermocouple psychrometer was used to measure the soil suction along the length of the sample and at different times in the laboratory. Initial suction measurements were done using the filter paper test. Curve fitting procedure established by (Aubeny and Lytton, 2003), has been used for the determination of the diffusion coefficient. Analytical validation of the moisture diffusion coefficient, required coefficient of permeability, 'k', slope of suction water characteristic curve 'S' and air entry value 'h0' as the major input parameters. Mitchell (1979) assumed the value of 'h0' to be 100 cm. In this research air entry value, 'h0' has been re-evaluated and it comes out to be higher than the pre estimated value. The value of slope of suction water characteristic curve, 'S' obtained from pressure plate tests, compares well to the empirical equation of Lytton (2003). The results of moisture diffusion coefficient obtained from the empirical equation come out in the same range as obtained from the refined Mitchell's (1979) drying test. The refinements includes introduction of constant temperature environment. Owing to the least variation in temperature, more reliable and reproducible data was obtained. The range of moisture diffusion coefficient, [alpha]-values obtained from empirical equation, comes out to be coherent with the laboratory data. Hence, it can be concluded that the research was successful.
Download or read book Unsaturated Soils Research and Applications written by Claudio Mancuso and published by Springer Science & Business Media. This book was released on 2012-06-23 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: These volumes contain the contributions to the Second European Conference on Unsaturated Soils, E-UNSAT 2012, held in Napoli, Italy, in June 2012. The event is the second of a series of European conferences, and follows the first successful one, organised in Durham, UK, in 2008. The conference series is supported by Technical Committee 106 of the International Society of Soil Mechanics and Geotechnical Engineering on Unsaturated Soils. The published contributions were selected after a careful peer-review process. A collection of more than one hundred papers is included, addressing the three thematic areas experimental, including advances in testing techniques and soil behaviour, modelling, covering theoretical and constitutive issues together with numerical and physical modelling, and engineering, focusing on approaches, case histories and geo-environmental themes. The areas of application of the papers embrace most of the geotechnical problems related to unsaturated soils. Increasing interest in geo-environmental problems, including chemical coupling, marks new perspectives in unsaturated soil mechanics. This book will provide a valuable up-to-date reference across the subject for both researchers and practitioners.
Download or read book Landslides and Engineered Slopes From the Past to the Future Two Volumes CD ROM written by Zuyu Chen and published by CRC Press. This book was released on 2008-06-11 with total page 2170 pages. Available in PDF, EPUB and Kindle. Book excerpt: 270 Expert contributions on aspects of landslide hazards, encompassing geological modeling and soil and rock mechanics, landslide processes, causes and effects, and damage avoidance and limitation strategies. Reference source for academics and professionals in geo-mechanical and geo-technical engineering, and others involved with research, des
Download or read book Soil Water Models written by R. DeJong and published by Research Branch, Agriculture Canada. This book was released on 1984 with total page 46 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Unsaturated Soils Two Volume Set written by Eduardo E. Alonso and published by CRC Press. This book was released on 2010-09-02 with total page 1532 pages. Available in PDF, EPUB and Kindle. Book excerpt: In recent decades the development of unsaturated soil mechanics has been remarkable, resulting in momentous advances in fundamental knowledge, testing techniques, computational procedures, prediction methodologies and geotechnical practice. The advances have spanned the full spectrum of theory and practice. In addition, unsaturated materials exhibiting complex behaviour such as residual soils, swelling soils, compacted soils, collapsing soils, tropical soils and solid wastes have been integrated in a common understanding of shared behaviour features. It is also noteworthy that unsaturated soil mechanics has proved surprisingly fruitful in expanding to other neighbouring areas such as swelling rocks, rockfill mechanics, and freezing soils. As a consequence, geotechnical engineering involving unsaturated soils can be now approached from a more rational and systematic perspective leading towards an improved and more effective practice. Unsaturated Soils contains the papers presented at the 5th International Conference on Unsaturated Soil (Barcelona, Spain, 6-8 September 2010). They report significant advances in the areas of unsaturated soil behaviour, testing techniques, constitutive and numerical modelling and applications. The areas of application include soil-atmosphere interaction, foundations, slopes, embankments, pavements, geoenviromental problems and emerging topics. They are complemented by three keynote lectures and three general reports covering general issues of modelling, testing and applications. Unsaturated Soils is a comprehensive record of the state-of-the art in unsaturated soil mechanics and a sound basis for further progress in the future. The two volumes will serve as an essential reference for academics, researchers and practitioners interested in unsaturated soils.
Download or read book Soil Water Characteristic Curves for Compacted Fine grained Soils written by James Martin Tinjum and published by . This book was released on 1995 with total page 460 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Handbook of Soil Sciences Two Volume Set written by Pan Ming Huang and published by CRC Press. This book was released on 2018-10-03 with total page 2249 pages. Available in PDF, EPUB and Kindle. Book excerpt: An evolving, living organic/inorganic covering, soil is in dynamic equilibrium with the atmosphere above, the biosphere within, and the geology below. It acts as an anchor for roots, a purveyor of water and nutrients, a residence for a vast community of microorganisms and animals, a sanitizer of the environment, and a source of raw materials for co
Download or read book Soil water Characteristic Curve written by Warren Scott Sillers and published by . This book was released on 1997 with total page 420 pages. Available in PDF, EPUB and Kindle. Book excerpt:
