Download or read book Hydraulic Fracture in Clays and Its Relation to the Performance of Earth Dams written by Mohamed Sief El Din Khorshid and published by . This book was released on 1974 with total page 464 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydraulic Fracturing in Earth rock Fill Dams written by Jun-Jie Wang and published by John Wiley & Sons. This book was released on 2014-08-11 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents a systematic and comprehensive study of hydraulic fracturing, original in its concentration of core soil problems There have been a number of well-studied cases in which dams have failed or been damaged by concentrated leaks for no apparent cause. In some of these experiences, investigators concluded that differential settlement cracks were the probable causes, even though no cracks were seen on the surface. In these examples, it was not determined whether the crack was open before the reservoir filled or whether it might have opened afterward. In several unsolved problems on the safety of the earth-rock fill dam, the problem of hydraulic fracture in the soil core of the earth-rock fill dam is one that is widely paid attention by designers and researchers. Hydraulic fracturing is generally considered as a key cause which may induce the leakage of the dam during first filling. In this extensive book, a new numerical simulate method is suggested. The method is based on the conventional two-dimensional finite element technique, and the theoretical formulations to calculate energy release rate using virtual crack extension method. The influence factors on convergence of calculated J integral are investigated. The accuracy of the calculated J integral is verified by analysing the three typical problems in Fracture Mechanics, in which propagation of crack may follow mode I, mode II and mixed mode I-II respectively. Using the new numerical method, the factors affecting the occurrence of hydraulic fracturing in the earth-rock fill dam are investigated. The investigating results indicate that increasing any of the Young’s modulus, the Poisson’s ratio and the density of the core soil is helpful to reduce the likelihood of the occurrence of hydraulic fracturing. The likelihood of the occurrence of hydraulic fracturing increases with increasing the water level or the crack depth. The lower part of the dam core is the zone in which the phenomenon of hydraulic fracturing may be induced easily. As an example to analyse the ability of earth-rock fill dam to resist hydraulic fracturing, the Nuozhadu Dam located in Western China is analysed. Presents a systematic and comprehensive study of hydraulic fracturing, original in its concentration of core soil problems Focuses on the problem of hydraulic fracturing in earth-rock fill dams from three aspects; conditions and mechanisms of hydraulic fracturing, criterion of hydraulic fracturing, and numerical method on hydraulic fracturing Examines advanced laboratory soil testing, application of numerical methods and field testing/monitoring, all needed for a better understanding of hydraulic fracturing in earth/rock fill dams Provides an essential reference in an area of scarce research in this field, and the need in high earth dam construction in developing countries is pressing Ideal for researchers in Hydraulic and Geotechnical Engineering Fields; Students on Masters or PhD courses; as well as Designers and Constructors in Hydraulic and Geotechnical Engineering Fields.
Download or read book Experience with Studies of Clay Erodibility in Greece written by DG. Coumoulos and published by . This book was released on 1977 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: This paper describes investigations, carried out in Greece, on dispersion properties of clays in connection with (a) the performance of the upper layers of an earth dam prior to the complete filling of its reservoir, and (b) the selection of clay materials to be used for the construction of earth dams. Data concerning typical high sodium content soils in Greece and chemical data concerning river and lake waters are presented. Methods adapted by the author for dispersion testing are described. The effect of the chemical analysis of the eroding fluid is discussed.
Download or read book Subjects of Dissertations Theses and Published Works Presented by Successful Candidates at Examinations for Higher Degrees written by University of London and published by . This book was released on 1967 with total page 766 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Susceptibility of Dispersive Clay at Grenada Dam Mississippi to Piping and Rainfall Erosion written by Edward Belk Perry and published by . This book was released on 1979 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 962 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theses and Dissertations Accepted for Higher Degrees written by University of London and published by . This book was released on 1970 with total page 522 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Hydraulic Fracturing in Zoned Earth and Rockfill Dams written by E. S. Nobari and published by . This book was released on 1973 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: The investigation involves two parts: first, an experimental investigation to study the phenomenon of hydraulic fracturing under carefully controlled laboratory conditions; and second, an analytical investigation to determine the conditions under which the stresses in the cores of zoned dams may be reduced sufficiently by arching so that hydraulic fracturing can occur. Analyses were also performed to examine the effectiveness of various countermeasures which can reduce the arching and the likelihood of hydraulic fracturing.
Download or read book Investigation of Stress in Rock written by and published by . This book was released on 1976 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: No other factor retards the progress of rock mechanics more than shortcomings in stress measurement. The papers presented at this symposium indicate progress in the development of techniques for measurement of stress and stress changes both on a field and point basis.
Download or read book Hydraulic Fracturing in Low Dams of Dispersive Clay written by O. G. Ingles and published by . This book was released on 1972* with total page 125 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Selected Water Resources Abstracts written by and published by . This book was released on 1991 with total page 760 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Erosion in Geomechanics Applied to Dams and Levees written by Stephane Bonelli and published by John Wiley & Sons. This book was released on 2013-04-08 with total page 223 pages. Available in PDF, EPUB and Kindle. Book excerpt: Erosion is the most common cause of failures at earth-dams, dikes and levees, whether through overtopping and overflowing, or internal erosion and piping. This book is dedicated to the phenomenon of internal erosion and piping. It is not intended to be exhaustive on the subject, but brings together some of the latest international research and advances. Emphasis is placed on physical processes, how they can be studied in the laboratory, and how test results can be applied to levees and dams. The results from several research projects in Australia, France, the Netherlands and the United States are covered by the authors. Our aim has been to share our most recent findings with students, researchers and practitioners. Understanding the failure of an earth-dam or a levee by erosion in a unified framework, whether internal erosion or surface erosion, requires continuous research in this field. We hope that the reader will gain knowledge from this book that leads to further progress in the challenging field of the safety of levees and dams. Contents 1. State of The Art on the Likelihood of Internal Erosion of Dams and Levees by Means of Testing, Robin Fell and Jean-Jacques Fry. 2. Contact Erosion, Pierre Philippe, Rémi Beguin and Yves-Henri Faure. 3. Backward Erosion Piping, Vera Van Beek, Adam Bezuijen and Hans Sellmeijer. 4. Concentrated Leak Erosion, Stéphane Bonelli, Robin Fell and Nadia Benahmed. 5. Relationship between the Erosion Properties of Soils and Other Parameters, Robin Fell, Gregory Hanson, Gontran Herrier, Didier Marot and Tony Wahl. About the Authors Stéphane Bonelli is a Research Professor at Irstea (French Environmental Sciences and Technologies Research Institute) in Aix-en-Provence, France. He has over 20 years of teaching and research experience, and has been a member of the ICOLD (International Commission on Large Dams) European Working Group on Internal Erosion since 2005. He has participated in 19 large dam reviews in France (visual inspection, monitoring data analysis and numerical modeling). His current activities include research, teaching and consultancy, focusing on soil erosion and the processes of levee breach.
Download or read book Long term Benefits and Performance of Dams written by British Dam Society. Conference and published by Thomas Telford. This book was released on 2004 with total page 692 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presents proceedings the 13th Conference of the British Dam Society held at the University of Kent, June 2004. These papers include discussion on the benefits that reservoirs can provide in terms of water supply and recreation, the environmental impact they can have, and the use of geomembranes to provide water tightness.
Download or read book An Experimental Investigation on the Hydraulic Fracturing of Compacted Clays written by Jihad Najib Bu-Ghanim and published by . This book was released on 1987 with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hydraulic fracturing has been realized to cause excessive leakage in earth dams which could eventually lead to catastrophic failure .Hydraulic fracturing seems to occur when the effective stresses become tensile and equal to the tensile strength of the soil . An experimental investigation on the hydraulic fracturing of a silty clay is conducted. The silty clay is characterized in terms of its strength parameters using traditional triaxial testing and a newly developed split tension test whereby the strength under a combination of tensile and compressive stresses could be determined. Perme-ability of the silty clay is also determined by means of a constant head permeability test. Hydraulic fracturing behavior is investigated for different states of stress and compaction variables. The hydraulic fracturing test is conducted on cylindrical specimens compacted with cylindrical hole of small diameter along their axes. A perforated brass tube is introduced in the central cavity and water is introduced at a given rate of flow . Hydraulic fracturing occurs when the water pressure in the hole drops for a given rate of flow. Results of hydraulic fracturing tests indicate that the water pressure required to induce hydraulic fracturing is significantly influenced by the state of applied stresses on the specimen, the compaction variables and the rate of water flow. The dimensions of the cracks induced by hydraulic fracturing initiate along a vertical plane at the boundary of the tube could propagate vertically, and horizontally along interface between compaction layers. Empirical correlations are established between applied stresses and hydraulic fracturing pressure .Experimental results are also compared with analytical predictions using the Mohr-Coulomb failure criterion, Haimson's model, and a model based on Massarsch plastic cavity expansion theory . Results of these comparisons show that none of these models could predict the hydraulic fracturing behavior for all test variables used. However, each model seems to fit a certain set of data depending on applied stresses and compaction variables . The Moher-Coulomb model seems to apply for specimens compacted wet of optimum using modified and standard AASHTO energy whereas Haimson model applies mostly for specimens compacted dry and at optimum moisture contents. Massarsch, on the other hand, does not seem to fit experimental results obtained.
Download or read book Proceedings written by Institution of Civil Engineers (Great Britain) and published by . This book was released on 1987-02 with total page 534 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Clay Barriers for Embankment Dams written by Institution of Civil Engineers (Great Britain) and published by Thomas Telford Publishing. This book was released on 1990 with total page 216 pages. Available in PDF, EPUB and Kindle. Book excerpt: Covers a range of recent developments in the design and construction of clay barriers for embankment dams and the interrelation between clay barriers and embankment and foundation designs.
Download or read book Hydraulic Fracturing in Earth Dams written by Samuel Yamoah Boakye and published by . This book was released on 1984 with total page 670 pages. Available in PDF, EPUB and Kindle. Book excerpt:
