Download or read book Evaluating the Stability of Existing Massive Concrete Gravity Structures Founded on Rock written by Robert M. Ebeling and published by . This book was released on 1997 with total page 276 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Repair Evaluation Maintenance and Rehabilitation Research Program Evaluating the Stability of Existing Massive Concrete Gravity Structures Founded on Rock written by and published by . This book was released on 1997 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The U.S. Army Corps of Engineers is responsible for designing and maintaining a large number of navigation and flood control structures. Many of the older massive concrete gravity hydraulic structures are being examined to determine if rehabilitation is required to meet stability criteria. The procedures currently used for evaluating the safety of existing massive hydraulic structures are the conventional equilibrium methods, which are the same general methods used in the design of these structures. Because the conditions of equilibrium are insufficient for a complete analysis of all aspects of structure foundation interaction involved in the stability and performance of these structures (soil structure foundation interaction in the case of earth retaining structures), these conventional equilibrium methods necessarily involve assumptions regarding aspects of the loading forces and the resisting forces that act on the hydraulic structures. Differences between actual field performance and calculations from conventional analysis have been noted for some existing hydraulic structures. Conventional design methods were developed based largely on classical limit equilibrium analysis without regard to deformation related concepts. Today, analytical tools such as the finite element method (FEM) are available which consider the manner in which the loads and resistance are developed as a function of the stiffnesses of the foundation rock, the structure foundation interface, and rock joints within the foundation. These analytical tools provide a means to evaluate the conventional equilibrium-based design methods used to evaluate the safety of existing hydraulic structures, and specifically, to identify and investigate key assumptions used in safety calculations from the conventional analysis.

Download or read book Re Evaluation of the Stability of Large Concrete Structures on Rock with Emphasis on European Experience written by K. Kovari and published by . This book was released on 1988 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sliding stability of a rock mass forming th e foundation or the abutments of concrete dams, of a natural slope, or of a cut cannot be measured directly but merely conjectured. One knows, however, conversely, remedial measures which may enhance the existing stability. Attention must be paid to sliding hazard if the presence of adversely oriented discontinuities with considerable persistence is evident, if movements take place in the rock mass, if high water pressures are measured in faults, and/or if wet spots are critical areas of a slope or downstream of the dam foundation are known to occur. A change in the flow rate of the drains can also be an indication of an unsafe condition. The most effective way and in many insstances the only practical solution to increase stability against sliding is to prevent or to eliminate the occurrence to excessive water pressure below the foundation or in faults. The second possibility involves reinforcements by anchoring and shear keys, and the third is removal or placement of rock masses and concrete in critical areas. The problem which arises in practice is to weigh correctly the different pieces of information relating to the assessment of the degree of stability. Foundation failure due to sliding is one of the predominant causes of failure to concrete dams. Sliding can occur along the contact between concrete and rock or along planes of weakness deep in the rock foundation or abutments. A particular problem arises from reservoir slopes instabilities which may generate reservoir waves overtopping the dam. (sdw).

Download or read book An Introduction to Improving Stability of Existing Concrete Structures written by J. Paul Guyer and published by Independently Published. This book was released on 2018-09-30 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt: Introductory technical guidance for civil, geotechnical and structural engineers interested in stabilization of existing, massive concrete structures such as dams, locks and flood walls. Here is what is discussed: 1. EVALUATION 2. PROCEDURES 3. IMPROVING STABILITY 4. CASE HISTORIES 5. ANCHORING STRUCTURES 6. ANCHORING STRUCTURES TO ROCK 7. TENSIONED ANCHOR LOADS 8. STRUCTURAL ANCHOR DESIGN 9. CLASSIFICATION OF STRUCTURES.

Download or read book Repair Evaluation Maintenance and Rehabilitation Research Program Re Evaluation of the Sliding Stability of Concrete Structures on Rock with Emphasis on European Experience written by K. Kovari and published by . This book was released on 1989 with total page 71 pages. Available in PDF, EPUB and Kindle. Book excerpt: The sliding stability of a rock mass forming the foundation or the abutments of concrete dames, of a natural slope, or of a cut cannot be measured directly but merely conjectured. One knows, however, the nature of the mechanisms which may lead to a failure, and, conversely, remedial measures which may enhance the existing stability. Attention must be paid to sliding hazard if the presence of adversely oriented discontinuities with considerable persistence is evident, if movements take place in the rock mass, if high water pressures are measured in faults, and/or if wet spots at critical areas of a slope or downstream of the dam foundation are known to occur. A changes in the flow rate of the drains can also be an indication of an unsafe condition. The most effective way and, in many instances, the only practical solution to increase stability against sliding is to prevent or to eliminate the occurrence of excessive water pressure below the foundation or in the faults. The second possibility involves reinforcements by anchoring and shear keys, and the third is removal or placement of rock masses and concrete in critical areas. The problem which arises in practice is to weigh correctly the different pieces of information relating to the assessment of the degree of stability. The aim of the authors is to draw attention to recent developments in stability analysis and in rock mass behaviour monitoring which may be helpful, in dealing with the problems encountered in practice. (kr).

Download or read book Re evaluation of the Sliding Stability of Concrete Structures on Rock with Emphasis on European Experience written by Kalman Kovári and published by . This book was released on 1989 with total page 74 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reliability and Stability Assessment of Concrete Gravity Structures RCSLlDE Theoretical Manual written by and published by . This book was released on 1998 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt: The reliability analysis of retaining walls and concrete gravity structures can be based on existing U.S. Army Corps of Engineers Computer-Aided Structural Engineering (CASE) performance assessment computer programs and algorithms for walls and structures that were validated over many years of use. The programs can be used to define the performance functions for reliability assessment. The objective of this study is to develop a reliability assessment methodology of the stability of concrete retaining walls and gravity structures based on an existing CASE computer program for evaluating their performance. The performance function for reliability assessment was defined in accordance with the CASE computer program. The reliability assessment methods used in this study include the advanced second moment method (ASM) and Monte Carlo Simulation (MCS) using importance sampling (IS). Correlated and noncorrelated random variables can be handled by the program. The computational procedure was developed around the CASE program for Sliding Stability of Concrete Structures (CSLIDE). Also, a user interface for CSLIDE and the reliability program based on CSLIDE (called RCSLIDE) was developed using Microsoft Visual BASIC. The software development procedure in this study is significant because it establishes a prototype reliability software that is modular and based on an existing CASE program.

Download or read book Reliability and Stability Assessment of Concrete Gravity Structures RCSLIDE written by Bilal M. Ayyub and published by . This book was released on 1998 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Harmonising Rock Engineering and the Environment written by Qihu Qian and published by CRC Press. This book was released on 2011-09-14 with total page 2048 pages. Available in PDF, EPUB and Kindle. Book excerpt: Harmonising Rock Mechanics and the Environment comprises the proceedings (invited and contributed papers) of the 12th ISRM International Congress on Rock Mechanics (Beijing, China, 18-21 October 2011). The contributions cover the entire scope of rock mechanics and rock engineering, with an emphasis on the critical role of both disciplines in sustai

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 Sustainable and Safe Dams Around the World Un monde de barrages durables et s curitaires written by Jean-Pierre Tournier and published by CRC Press. This book was released on 2019-08-08 with total page 384 pages. Available in PDF, EPUB and Kindle. Book excerpt: These proceedings include digital media with the full conference papers (3600+ pages). Sustainable and Safe Dams Around the World contains the contributions presented at the 2019 Symposium of the International Commission on Large Dams (ICOLD 2019, Ottawa, Canada, 9-14 June 2019). The main topics of the book include: 1. Innovation (recent advancements and techniques for investigations, design, construction, operation and maintenance of water or tailings dams and spillways) 2. Sustainable Development (planning, design, construction, operation, decommissioning and closure management strategies for water resources or tailings dams, e.g. climate change, sedimentation, environmental protection, risk management). 3. Hazards (design mitigation and management of hazards to water or tailings dams, appurtenant structures, spillways and reservoirs (e.g. floods, seismic, landslides). 4. Extreme Conditions (management for water or tailings dams (e.g. permafrost and ice loading, arid/wet climates, geo-hazards). 5. Tailings (design, construction, operation and closure for tailings dams; recent advancements and best practice) Sustainable and Safe Dams Around the World will be invaluable to academics and professionals interested or involved in dams. Un monde de barrages durables et sécuritaires contiennent les contributions présentées lors du symposium de 2019 de la Commission internationale des grands barrages (CIGB 2019, Ottawa, Canada, 9-14 juin 2019). Les principaux sujets du livre incluent: 1. Innovation (Avancées et techniques récentes pour l’investigation, la conception, la construction, l’exploitation et l’entretien de barrages hydrauliques, de barrages de stériles et d’évacuateurs de crues) 2. Développement durable (stratégies de gestion pour la planification, la conception, la construction, l’exploitation, la mise hors service et la fermeture de barrages hydrauliques ou des barrages de stériles, par exemple, changement climatique, sédimentation, protection de l’environnement, gestion des risques). 3. Risques (mesures d’atténuation et gestion des risques liés aux barrages hydrauliques et barrages de stériles, aux ouvrages annexes, aux évacuateurs de crues et aux réservoirs, par exemple, inondations, tremblements de terre, glissements de terrain). 4. Environnement extrême (gestion des barrages hydrauliques et barrages de stériles, par exemple, pergélisol et charge de glace, climats secs / humides, géorisques). 5. Barrages de stériles (conception, construction, exploitation et fermeture des barrages de stériles; avancées récentes et meilleures pratiques). Un monde de barrages durables et sécuritaires seront d'une valeur inestimable pour les universitaires et les professionnels intéressés ou impliqués dans les barrages.

Download or read book Hearings written by United States. Congress. House and published by . This book was released on 1968 with total page 3182 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Public Works Appropriations for 1969 for Water and Power Resources Development and the Atomic Energy Commission written by United States. Congress. House Appropriations and published by . This book was released on 1968 with total page 1682 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Public Works Appropriations for 1969 for Water and Power Resources Development and the Atomic Energy Commission written by United States. Congress. House. Committee on Appropriations and published by . This book was released on 1968 with total page 1672 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Public Works Appropriations for 1969 for Water and Power Resources Development and the Atomic Energy Commission written by United States. Congress. House. Committee on Appropriations. Subcommittee on Public Works and published by . This book was released on 1968 with total page 1688 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Numerical Modelling of Discrete Materials in Geotechnical Engineering Civil Engineering and Earth Sciences written by Heinz Konietzky and published by CRC Press. This book was released on 2004-11-23 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this fully up-to-date volume, important new developments and applications of discrete element modelling are highlighted and brought together for presentation at the First International UDEC/3DEC Symposium. Papers covered the following key areas: * behaviour of masonry structures (walls, bridges, towers, columns) * stability and deformation of tunnels and caverns in fractured rock masses * geomechanical modelling for mining and waste repositories * rock reinforcement design (anchors, shotcrete, bolts) * mechanical and hydro-mechanical behaviour of dams and foundations * rock slope stability, deformation and failure mechanisms * modelling of fundamental rock mechanical problems * modelling of geological processes * constitutive laws for fractured rock masses and masonry structures * dynamic behaviour of discrete structures. Numerical Modelling of Discrete Materials in Geotechnical Engineering, Civil Engineering, and Earth Sciences provides an ultra-modern, in-depth analysis of discrete element modelling in a range of different fields, thus proving valuable reading for civil, mining, and geotechnical engineers, as well as other interested professionals.

Download or read book Methods of Evaluating the Stability and Safety of Gravity Earth retaining Structures Founded on Rock written by Robert M. Ebeling and published by . This book was released on 1990 with total page 89 pages. Available in PDF, EPUB and Kindle. Book excerpt: Comparisons between the results of backfill placement analyses using finite element and the conventional equilibrium analyses indicate that conventional analyses are conservative. The finite element analyses indicate that the backfill exerts downward shear loads on the backs of retaining walls. These shear forces have a stabilizing effect on the walls. Shear loading ranged in value from 0.09 to 0.21, depending on the geometrical features and the values of the material parameters involved in the problem. In general, as the wall moves away from the backfill, the lateral forces exerted on the wall by the backfill decrease, and the lateral forces exerted on the front on the wall by the toe-fill increase. Keywords: Soil structure interaction; Soils/pressure; Loads forces; Walls/deformation/displacement; Foundations structures/rock; Soil stabilization; Backfills/stiffness; Shear stresses; Earth fills. (MM).