Download or read book Hydraulic Conductivity and Pore Size Distribution of Compacted Soils written by Roy Henry Schmidt and published by . This book was released on 1961 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Change in Pore Size Distribution of Compacted Soil Layers and Its Effect on Solute Breakthrough Curves written by Sara Karimi and published by . This book was released on 2012 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is often useful to predict contaminant migration from waste containment systems, such as landfills, as part of the assessment of the overall impact of such systems on the receptor environment. In many instances, material properties, for example, those of the liner, are assumed to be constant. This study was conducted to evaluate the accuracy of considering constant material and transport parameters in the modelling of sodium and chloride breakthrough curves through a compacted soil layer using the commercial software, Pollute v.7. Experiments were conducted with three different mixtures of glass beads and varying amounts of kaolinite (30, 40 and 50% by weight). The base line hydraulic conductivity K of the samples was established using distilled water as permeant. The observed values of K were 8.2X10-11 m/s, 1.28X10-10 m/s and 1.48X10-10 m/s for the 30, 40 and 50% kaolinite, respectively. These values did not change when the permeant was changed from distilled water to 0.04 M NaCl Effective diffusion coefficient of 3.5-8.5 x 10-10 m2/s was obtained for sodium and 1.9-4 x 10-10 m2/s for chloride. These results also showed that diffusion of both ions in the soils was affected by the percentage of clay fraction. The greater the amount of clay, the lower the diffusion coefficient obtained. Moreover, the diffusion coefficient of sodium was approximately two times that of chloride and this trend was visually apparent from the shape of the breakthrough curves for Na+ and Cl-. Modelling with constant porosity overestimated the concentration of both ions. The pore size distribution of each mixture was determined from mercury intrusion porosimetry testing before and after hydraulic conductivity test. The results showed a decrease of 24%, 13% and 12% in the porosity of the 30, 40 and 50% kaolinite mixture. Sensitivity analysis carried out by decreasing the porosity of the mixture by these percentages did not alter breakthrough curves noticeably. On the other hand, sensitivity analysis based on changes in the distribution coefficient and diffusion coefficient showed a considerable change in model outputs. It was concluded that although the porosity changed during hydraulic conductivity test, it did not eliminate the discrepancy between experimental results and modelling results, In fact, the model was found to be more sensitive to change in diffusion coefficient and distribution coefficient. Therefore, more studies are required to monitor these parameters during hydraulic conductivity testing.
Download or read book Water Quality on the Hydraulic Conductivity for Various Bulk Densities of Soils written by Mudhaffer Abdul-Kadir Ismail and published by . This book was released on 1967 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Effects of Compaction on the Hydrologic Properties of Forest Soils in the Sierra Nevada written by Peter H. L. Cafferata and published by . This book was released on 1983 with total page 160 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydraulic Barriers in Soil and Rock written by Arnold Ivan Johnson and published by ASTM International. This book was released on 1985 with total page 336 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pore Size Distribution of Compacted Soils After Critical Region Drying written by Rakhishwar Nath Bhasin and published by . This book was released on 1975 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Landforming written by Horst J. Schor and published by John Wiley & Sons. This book was released on 2007-08-07 with total page 370 pages. Available in PDF, EPUB and Kindle. Book excerpt: The first hands-on instruction guide to landform grading and revegetation Landform grading provides a cost-effective, attractive, and environmentally compatible way to construct slopes and other landforms that are stable and that blend in with the natural surroundings. Landform grading design and construction technology have advanced rapidly during the past decade, and this book explains the technique, its uses, its various applications, and its significant advantages. Landforming: An Environmental Approach to Hillside Development, Mine Reclamation and Watershed Restoration, presents the first comprehensive and practical guidebook to the innovative techniques of landform grading and revegetation. Citing numerous practical applications in such areas as hillside housing developments, mass grading operations, surface mining and watershed reclamation projects, the authors--one an internationally recognized instructor and the other an engineer with over thirty years of practical experience in the field--have teamed up to provide valuable information on: The aesthetic and ecological benefits of landform grading and revegetation Analyses that demonstrate the stability of landform designed slopes Real-world design/construction procedures Construction in both upland slope areas and in stream corridors Analytical procedures and design aids to assist implementation Well documented and comprehensive case studies of actual projects Written in straightforward language and liberally illustrated with informative photographs and schematic drawings, the text should prove of value to practicing professionals in such diverse fields as land planning, civil and geotechnical engineering, landscape architecture, and geology as well as to personnel in a variety of local, state and federal regulatory agencies and environmental interest groups. HORST J. SCHOR is the originator of the Landforming and Revegetation Concept and is Principal of H.J. Schor Consulting. He has developed landform grading designs that have been implemented in a variety of hillside grading and mining reclamation projects for a diverse list of clients. He has been a guest lecturer at The University of Wisconsin-Madison, The University of Dresden, Germany and The University of California at Irvine. DONALD H. GRAY, PHD, is Professor Emeritus of Civil and Environmental Engineering at The University of Michigan. In addition to speaking and teaching internationally, he has co-authored three books on subjects related geotechnical engineering and biotechnical slope protection.
Download or read book Relationship of Laboratory and Field determined Hydraulic Conductivity in Compacted Clay Layer written by A. S. Rogowski and published by . This book was released on 1990 with total page 246 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydraulic Conductivity written by Lakshmanan Elango and published by BoD – Books on Demand. This book was released on 2011-11-23 with total page 450 pages. Available in PDF, EPUB and Kindle. Book excerpt: There are several books on broad aspects of hydrogeology, groundwater hydrology and geohydrology, which do not discuss in detail on the intrigues of hydraulic conductivity elaborately. However, this book on Hydraulic Conductivity presents comprehensive reviews of new measurements and numerical techniques for estimating hydraulic conductivity. This is achieved by the chapters written by various experts in this field of research into a number of clustered themes covering different aspects of hydraulic conductivity. The sections in the book are: Hydraulic conductivity and its importance, Hydraulic conductivity and plant systems, Determination by mathematical and laboratory methods, Determination by field techniques and Modelling and hydraulic conductivity. Each of these sections of the book includes chapters highlighting the salient aspects and most of these chapters explain the facts with the help of some case studies. Thus this book has a good mix of chapters dealing with various and vital aspects of hydraulic conductivity from various authors of different countries.
Download or read book Unsaturated Soils Research Applications written by Nasser Khalili and published by CRC Press. This book was released on 2014-06-05 with total page 1850 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsaturated Soils: Research and Applications contains 247 papers presented at 6th International Conference on Unsaturated Soils (UNSAT2014, Sydney, Australia, 2-4 July 2014). The two volumes provide an overview of recent experimental and theoretical advances in a wide variety of topics related to unsaturated soil mechanics: - Unsaturated Soil Behavior - Experimentation - Modelling - Case Histories - Geotechnical Engineering Problems - Multidisciplinary and New Areas Unsaturated Soils: Research and Applications presents a wealth of information, and is of interest to researchers and practising engineers in soil mechanics and geotechnical engineering. These proceedings are dedicated to Professor Geoffrey E. Blight (1934-2013), who passed in November 2013.
Download or read book The Hydrologic Evaluation of Landfill Performance HELP Model written by and published by . This book was released on 1994 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Advances in Unsaturated Soils written by Bernardo Caicedo and published by CRC Press. This book was released on 2013-02-01 with total page 612 pages. Available in PDF, EPUB and Kindle. Book excerpt: New theories and testing techniques related with Unsaturated Soil Mechanics have proven to be valuable tools to study a broad spectrum of geo-materials which includes rocks, rock fills, frozen soils and domiciliary solid wastes. These new theories and testing techniques have permitted the analysis of several traditional problems from a new perspective (e.g., swelling or collapsible soils and compacted soils or pavements materials), and they have also shown their efficiency to study new energy-related problems like CO2 sequestration and nuclear waste disposal. Advances in Unsaturated Soils is a collection of papers from the 1st Pan-American Conference on Unsaturated Soils organized in Cartagena de Indias, Colombia, in February 2013. The volume includes 76 research papers coming for all over the world, as well as 7 keynotes papers by well known international researchers. The contributions present a variety of topics including: • Advances in testing techniques • Unsaturated soil behavior • Constitutive modeling and microstructure • Numerical modeling • Geotechnical problems Advances in Unsaturated Soils is expected to become a useful reference to academics and professionals involved in Unsaturated Soil Mechanics.
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 State of the art Field Hydraulic Conductivity Testing of Compacted Soils written by Joseph O. Sai and published by . This book was released on 1991 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Mechanics and Related Processes in Structured Agricultural Soils written by W.E. Larson and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt: Agricultural soils are subjected to many applied mechanical stresses that influence their behavior. Stresses arise from tillage machines, seeders and chemicals applicators, tractors, and equipment for harvest and transport. Applied stresses may compact or loosen the bulk soil. Micro sections of soil (aggregates or clods) may be compacted during tillage while the bulk soil is loosened. Because most granular soils are combined into structural units of varying sizes with different strengths and properties, prediction of the effect of stresses on the behavior of bulk soils is difficult. The basic strength properties of soil are determined by many fac tors: the size distribution of particles, chemical and mineralogical properties of inorganic clay fraction, the organic matter content and composition, the water content and the stress history. These factors combine and interact to produce many possible behavior patterns. Changes in structure of the soil from applied stresses and biologi cal reactions may profoundly influence storage and transmission of water, heat, and air, and the mechanical resistance to penetration by plant roots. They may also affect the traction of vehicles. Manipulation of structural properties of soils by tillage implements is a major cost under most crop production systems. Reduced energy use is also a significant conservation objective. Improved management systems are very dependent upon a better understanding of soils' response to applied stresses. The content of this book resulted from a NATO Advanced Research Workshop held in St. Paul, Minnesota, U.S.A. September 13-16, 1988.
Download or read book Evaluating the Saturated and Unsaturated Hydraulic Conductivity of Soils written by K. Cartwright and published by . This book was released on 1981 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method of calculating the saturated and unsaturated hydraulic conductivities of soils and similar porous materials based on the pore size distribution was shown to predict the experimentally measured values adequately. For coarse-textured soil materials or materials with a relatively narrow range of pore size, only one matching factor is required to calculate the hydraulic conductivity-water content relation accurately enough for many purposes; however, for fine-textured soil materials with a wide range of pore size distribution, two or more matching factors at a water content in the 0.3 to 0.4 bar range may be needed to obtain a useful evaluation for the unsaturated hydraulic conductivity.
Download or read book Soil Compaction in Crop Production written by B.D. Soane and published by Elsevier. This book was released on 2013-10-22 with total page 695 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a global review of the mechanisms, incidence and control measures related to the problems of soil compaction in agriculture, forestry and other cropping systems. Among the disciplines which relate to this subject are soil physics, soil mechanics, vehicle mechanics, agricultural engineering, plant physiology, agronomy, pedology, climatology and economics.The volume will be of great value to soil scientists, agricultural engineers, and all those involved with irrigation, drainage and tillage. It will help to facilitate the exchange of information on current work throughout the world, as well as to promote scientific understanding and stimulate the development, evaluation and adoption of practical solutions to these widespread and urgent problems.
