Download or read book Investigation of a New Method for Measuring Unsaturated Soil Hydraulic Properties written by Mohamed Mahmoodian-Shoosthari and published by . This book was released on 1980 with total page 272 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Chambre des pairs impressions diverses session de 1840 Tome 1 n 15 written by and published by . This book was released on 1840 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Indirect Methods for Estimating the Hydraulic Properties of Unsaturated Soils written by M. Th Van Genuchten and published by . This book was released on 1992 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Investigation and Modeling of Unsaturated Flow Through Swelling Soils written by Taghi Ebadi and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Although the theory of water movement through an unsaturated, swelling soil has been developing for a number of years, the efficiency of the results has been limited, and the developed models have suffered from a lack of a mechanism to reliably define water flow and experimental techniques for measuring the unsaturated soil hydraulic properties. The intent of the present research is to elucidate and to investigate the theory of flow through unsaturated, swelling soil, to develop a three dimensional theoretical model based on a reliable soil swelling and unsaturated flow mechanism and, furthermore, to characterize the relationships between different soil hydraulic and swelling properties. In the first part, based on the water adsorption mechanism by the soil particles and the use of continuum theory principles, a theoretical model of unsaturated flow through swelling soil has been developed. Some new techniques were established to measure the different soil swelling and hydraulic properties and to analyze the effect of the soil's initial conditions. The reliability of the different existing empirical models, to be applied to the results obtained from hydraulics, shrinkage and swelling experiments, were investigated and modified where necessary. A static neural network model was developed to mathematically characterize the experimental results being used in the proposed numerical solution of the mathematical model. The neural network model works based on the back-propagation error method with adaptive learning rules by means of the neural network tool box of MATLAB software. A finite difference numerical model, based on a fully implicit method, was proposed to numerically solve the one dimensional governing equation (simplified form of 3D governing equation). For this part of the study, a computer program in C++ language was developed. Finally, the results of the numerical method were verified using the results obtained from infiltration tests. The tests were conducted for the semi-infinite soil columns having three different confinement conditions: completely confined, semi-confined and free swelling. The results show a clear agreement between the output of the developed numerical model and the experimental data. As one of the conclusions, the results of the numerical analysis of the developed mathematical model agreed reasonably well with those of the experiments. The study also indicated that the static neural network model, as one of the most promising models, can precisely characterize any experimental function related to the soil properties and cooperates with other numerical approaches such as finite difference method to solve a highly nonlinear partial differential equation such as unsaturated flow equation.

Download or read book The UNSODA Unsaturated Soil Hydraulic Database written by and published by . This book was released on 1996 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Infiltration Measurements for Soil Hydraulic Characterization written by Rafael Angulo-Jaramillo and published by Springer. This book was released on 2016-06-29 with total page 396 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book summarises the main results of many contributions from researchers worldwide who have used the water infiltration process to characterize soil in the field. Determining soil hydrodynamic properties is essential to interpret and simulate the hydrological processes of economic and environmental interest. This book can be used as a guide to soil hydraulic characterization and in addition it gives a complete description of the treated techniques, including an outline of the most significant research results, with the main points that still needing development and improvement.

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 A Field Method of Measuring Soil Hydraulic Conductivity Above the Water Table written by Mahmoud Abd El-Haliem Abu-Zied and published by . This book was released on 1960 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Hydraulic Conductivity Measurement in Unsaturated Soils with a Modified Cone Penetrometer written by and published by . This book was released on 1999 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this project, a new cone penetration test (CPT) method for the determining the hydraulic properties of unsaturated soil was developed. A modified cone penetrometer (cone permeameter) is used to inject water into the soil under constant pressure through a screen and measure movement of the wetting front with tensiometer rings. An inverse methodology is used to analyze the cumulative inflow volume and pressure head readings to obtain estimates of the hydraulic conductivity and soil moisture retention curves for the soil. To accomplish the inversion, a cone permeameter test is numerically simulated with the radially symmetric form of Richard's equation and the van Genuchten hydraulic conductivity and moisture retention functions. An objective function expressing the differences between flow responses measured with the cone permeameter and those predicted using the numerical model with the parameterized soil hydraulic properties is minimized to obtain the hydraulic parameter estimates. Full scale tests in a laboratory aquifer and field tests were performed during the course of this study. Excellent agreement between saturated hydraulic conductivity values obtained with the cone permeameter and values from in-situ Guelph permeameter and laboratory falling head tests was obtained. Soil moisture retention curves were similar to those obtained from multi-step outflow and capillary rise tests.

Download or read book Soil Hydraulic Properties written by Nabil Ibrahim Mina and published by . This book was released on 1994 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsaturated flow through porous media has gained a lot of attention in recent decades in many fields of agriculture and hydrology. Examples are many, of which are deficit irrigation and contaminants transport. Several models simulating unsaturated flow processes require as input the diffusivity -water content relation (D-0) and/or the hydraulic conductivity-water content relation (K-0). Several techniques for measuring or predicting these relations were developed throughout the literature. Most of these techniques involve either analytical and quasi-analytical solutions of the governing non-linear partial differential equation, or laboratory experiments, which are both expensive and time consuming. In this research, an experimental model was developed based on the field capacity concept and requires only measurements of the wetting depth with time. The laboratory setup is simple and inexpensive, consisting of uniformly packed soil columns. Three replicates of three different soil textures were used. Water was added to the columns and measurements of the wetting depths were taken after infiltration has virtually ceased; these measurements were then used to get the D-0 relation. With the aid of the soil moisture characteristic curves developed by the pressure plate method, the K-0 relation was determined. Results produced by this model showed trends that were in good agreement with some empirical relations in the literature, especially for fine textured soils. The best fitted relations for clay and sandy clay loam soils were of the power function and the exponential function types. For coarse textured soils (sand) the data were scattered and the developed model was not valid, - this was due to neglecting the gravity term in the model. The values of the fitted experimental parameters were too high as compared with those in the literature.

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 Estimation of Unsaturated Soil Hydraulic Properties from Transient Laboratory and Field Experiments written by Simon Oyaro Eching and published by . This book was released on 1993 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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 1872 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 Behavi

Download or read book Souvenir Picture Book of the Bruce Museum written by and published by . This book was released on with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific Investigations Report written by Sharon E. Kroening and published by . This book was released on 2004 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Unsaturated Soils Experimental Studies written by Tom Schanz and published by Springer Science & Business Media. This book was released on 2006-03-04 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings document the various papers delivered and partially presented at the International Conference “From experimental evidence towards numerical modeling of unsaturated soils,” which was held in Weimar (Germany) during 18-19 September 2003. The conference was organized under the auspices of the International Society of Soil Mechanics and Geotechnical Engineering (ISSMGE) and the National German G- technical Society (DGGT). The need to understand the behavior of unsaturated soils is becoming exclusively - sential for the geotechnical engineers and designers. In the last three decades many - searchers have made significant contribution to the understanding of the unsaturated soil mechanics. Nevertheless, application of the subject to variety of new problems still - quires our attention. This International conference is a mere attempt to unite researchers and engineers in geotechnical engineering and to discuss about the problems associated with the unsaturated soils. Doing so the objectives of these lecture notes are as follows: - to promote unsaturated soil mechanics for practical application, - to exchange experiences in experimental unsaturated soil mechanics and numerical modeling, - to discuss application of unsaturated soil mechanics to variety of problems. In other words, we could also name these two volumes as “From theory to daily pr- tice”. I would like to extend my deep sense of appreciation as the editor and the Head of the organizing committee, to many persons who have contributed either directly or indirectly to organize the International conference and to finalize these proceedings.

Download or read book Unsaturated Soils Two Volume Set written by Olivier Buzzi and published by CRC Press. This book was released on 2009-11-02 with total page 942 pages. Available in PDF, EPUB and Kindle. Book excerpt: Unsaturated soil mechanics is now increasingly recognized as an integral part of mainstream soil mechanics, and the importance and relevance of unsaturated soil mechanics for the broad field of geotechnical engineering no longer needs to be emphasized. The two volumes making up Unsaturated soils include papers from the 4th Asia Pacific Confere