Conventional concrete and roller compacted concrete rcc are both addressed. Curved gravity dams designed for arch action and other types. Gravity dams are constructed from masonry or concrete. Gravity dam dam civil engineering free 30day trial. That is, the dam has a center of gravity low enough that the dam will not topple if unsupported at the abutments. Its experimental findings indicated that use of a ramp increases the shear length l j and free surface aeration of the water jet. Basically, gravity dams are solid concrete structures that maintain their stability against design loads from the geometric shape and the mass and. Masonry gravity dams a numerical application for stability. Check dam is a small dam designed to reduce flow velocity and control soil erosion diversion dam is a type of dam that diverts all or a portion of the flow of a river from its natural course masonry dam is a type of dam constructed with masonry. In r and r15,8units of r09 syllabus are combined into 5units in r and r15 syllabus. Water resources engineering ii notes pdf wre ii notes pdf. Height is the vertical dimension from the downstream toe of the dam at. This cross section eventually evolved into the common triangular cross section design of todays gravity dams.
The first version of a modern gravity dam was built between 1765 and 1800 in mexico. Although the weight of dam also helps in resisting the forces, the structural behaviour of earthen dam is entirely different fro. In two dimensional analysis of the gravity dam, unit length of the dam is considered. One of the most important structural component of a dam spillway evacuates the flood wave from reservoir to river at the downstream. An earth dam is made of earth or soil built up by compacting successive layers of earth, using the most impervious materials to form a core and placing more permeable substances on the upstream and. A concrete gravity dam has a cross section such that with a flat bottom, the dam is free standing. Failure of dam notes word gravity dam stability analysis. Failure of gravity dam occurs due to overturning, sliding, tension and compression. Forces on gravity dam irrigation engineering youtube. Stability analysis of gravity dams for the maximum. In fact, it can be noticed that, mainly for traditional reasons, straight gravity structures, conventional or rcc gravity dams, but also fill dams with a core or a. What is the major difference between an earthen dam and a.
Gravity dams require maximum amounts of concrete for their construction as compared with other kinds of. These notes are according to the r09 syllabus book of jntu. The inward compression of the dam by the water reduces the lateral horizontal force acting on the dam. Early dam building took place in mesopotamia and the middle east. Idukki is a hill station in india, is much famous for its wildlife treasure keenly followed by other attractions too. Forces acting on a gravity dam, causes of failure of a gravity dam, elementary profile and practical profile of a gravity dam, limiting height of a low gravity dam, factors of safety stability analysis, foundation for a gravity dam, drainage and inspection galleries.
List of dams in india state gujarat banaskantha dist. List of dams in india state himachal pradesh bhakra nangal dam. Concrete gravity dams should be evaluated to accommodate full. Em 111022200 30 june 1995 us army corps of engineers engineering and design gravity dam design engineer manual availability copies of.
Figure 44 shows such a composite structure built by the bureau of reclamation. For concrete dams, the stress developed at the junction of the base becomes quite high, which the foundation has to resist. Design and construction considerations for hydraulic. A gravity dam can be combined with an arch dam into an arch gravity dam for areas with massive amounts of water flow but less material available for a purely gravity dam. Pdf gravity dam design engineer manual ivan ramirez. The section of the gravity dam is approximately triangular in shape, with its apex at its top and maximum width at bottom. A gravity dam is mostly straight in plan and is known as straight gravity dam. Cheruthoni dam, the largest concrete gravity dam in kerala, is located close to idukki arch dam. Design and construction considerations for hydraulic structures. A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by primarily using the weight of the material alone to resist the horizontal pressure of water pushing against it. Design and construction considerations for hydraulic structures in addition, appendices are included that contain guide specifications for rcc construction appendix a, a summary of rcc costs appendix b, and samples of adiabatic temperature rise tests of rcc appendix c. It is intended to implement an internal drainage facility, which would reduce uplift pressure by about 20%. If you have any doubts please refer to the jntu syllabus book.
Apr 30, 2016 adi numerical on gravity dam ce in hindi duration. A force of 1 lbf causes a mass of 1 lbm to accelerate at 32. Different forces acting on gravity dam civil engineering. This gravity dam featured an originally 9metrehigh 30 ft and 1 mwide 3. List of dams in india gk materials free pdf download. Comparison of design and analysis of concrete gravity dam 19. Uplift pressues, shear strengths, and tensile strengths for stability analysis of concrete gravity dams, volume i, epri tr100345. Guidelines for design of dams table of contents section title page preface to the january 1 1989 edition 1 introduction 2 2 definitions 3. The discharging conduit evacuates the flow from the approach facility to. The following are the various methods which can be adopted for carrying out the stability analysis of gravity dams.
All the predominant forces that act on the dam have been shown in the figure itself. Forces acting on damsnotes gallary explained forces acting. Dams were used to control the water level, for mesopotamias weather affected the tigris and euphrates rivers the earliest known dam is the jawa dam in jordan, 100 kilometres 62 mi northeast of the capital amman. The weight of the dam body and its foundation is the major resisting force. Spillways overflow spillways spillway crest profile kokpinar dam carried out extensive experiments to investigate the hydraulic performance of a ramp. Rockfill dams are popular in tropical climates because their construction is suitable for long periods of high rainfall. The most ancient gravity dam on record was built in egypt more than 400 years b.
Dams handwritten notes 2017 pdf free download medicforyou. Gravity dam loads on concrete dams loads can be classified in terms of applicabilityrelative importance as primary loads, secondary loads, and exceptional loads. List of dams in india state punjab bakhra nangal dam. I a simplified analysis procedure in which the response due only to the fundamental vibration mode is estimated directly from the earthquake design spectrum. This method of stability analysis is also sometimes known as two dimensional methods. Figure 11 example of concrete gravity dam gravity dams are classified as solid or hollow. A detailed sketch of a gravity dam is shown in fig.
Gravity dam stability analysis failure of gravity dam occurs due to overturning, sliding, tension and compression. Concrete gravity dams should be evaluated to accommodate. The magnitude of this force varies from 250 1500 knm 7. The most common classification used for the discussion of design procedures is based upon the materials used to build the structure. T he dams is one of the prestigious and successful career point for mbbs students preparing to pursue postgraduation after mbbs through neet exam. Forces acting on damsnotes gallary explained forces. Chapter 9 center of gravity, center of mass and centroid for. It is the third highest dam in india with a 454 feethigh across river cheruthoni. Gravity damgravity dam a gravity dam is an engineering structurea gravity dam is an engineering structure that by its own weight, resists the forcesthat by its own weight, resists the forces imposed with a desired factor of safetyimposed with a desired factor of safety 2. From the definition of a resultant force, the sum of moments due to individual particle weight about any point is the same as the moment due to the resultant weight located at g. Grand coulee dam usa, nagarjuna sagar dam india and itaipu dam between brazil and paraguay. Gravity dam free download as powerpoint presentation. Exercise problem 1 a concrete gravity dam 15 m height will be constructed with the dimensions shown in the figure below. A curved gravity dam resists the external forces by its weight and not by arch action.
Gravity dams are designed so that each section of the dam is stable and independent of any other dam section. The section is so proportioned that it resists the various forces acting on it by its own weight. Later gravity dams used a trapezoidal cross section. This engineer manual supersedes em 111022200 dated 25 september 1958. Gravity dams may be classified by plan as straight gravity dams and curved gravity.
The procedures in this manual cover only dams on rock foundations. It resists the forces exerted upon it mainly due to shear strength of soil. Therefore, it results in higher forced aeration as compared. The solid head or massive buttress dam is the most prominent modern variant of the type, and may be considered for conceptual purposes as a lightened version of the gravity dam. In this method, the dam is considered to be composed of parallel sided vertical cantilevers. Stability analysis of concrete gravity dam using fem dragan rakic1, milan bojovic1, snezana vulovic1, miroslav zivkovic1, dejan divac2, nikola milivojevic2 1faculty of engineering, university of kragujevac, sestre janjic 6, 34000 kragujevac, serbia.
This force acts linearly along the length of the dam and at the reservoir level. Both of the dams present a stable geometry but the wall volumes differ by about 45%. Gravity dam is constructed of concrete andor masonry andor laidup stone that relies upon its weight for stability. Forces acting on a gravity dams with diagram geography. The list has been separated as mbbs first year, second year, third year and fourth year. Gir national park junagadh dist sardar sarovar dam. Adi forces acting on gravity dam ce in hindi youtube. Masonry dams are typically used to block streams running through relatively narrow gorges, as in mountainous terrain.
Ppt gravity dam powerpoint presentation free to view. Storage worksreservoirs types of reservoirs, selection of site for reservoir, zones of storage of a reservoir, reservoir yield, estimation of. View notes forces acting on dams notes gallary explained from social science 101 at university of dar es salaam. Online courses for civil engineering covering full. The upstream face may be kept throughout vertical or partly slanting for some of its length. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Concrete gravity dams are suitable for sites where there is a. The solid form is the more widely used of the two, though the hollow dam is frequently more economical to construct. Safety factors apply to the calculation of stress and the. Failure of gravity dams causes and its failure modes.
In structural concept the buttress dam consists of a continuous upstream face supported at regular intervals by downstream buttresses. It is made watertight by pointing the joints with cement. A concrete gravity dam is a massive concrete structure, roughly triangular in shape, and designed so that its weight ensures structural stability against the hydrostatic pressure of the impounded water and other forces that may act on the dam. It is intended to implement an internal drainage facility, which would reduce uplift pressure by. Gravity dams gravity dams criteria for selection of dam site, construction material, forces acting on gravity dam, modes of failure, stability analysis, safety criteria, methods of design, stress analysis and stress contours, galleries, instrumentation, joints, keys, water seals, temperature control in concrete dams, foundation treatment. A gravity dam is designed in such a way that it resists all external forces acting on the dam like water pressure, wind pressure, wave pressure, ice pressure, uplift pressure by its own selfweight. A drainage gallery is generally provided in order to relieve the uplift pressure exerted by the seeping water. Forces a gravity dam is a solid structure, made of concrete or masonry, constructed across a river to create a reservoir on its upstream. A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using the weight of the material alone to resist the horizontal pressure of water pushing against it. The dam is composed of three blocks of equal heights. Previous ferc gravity dam guidance dealt with nappe forces by ignoring. His notes and advices were often fundamental to improve my work. Methods of analysis of gravity dam stability are discussed, and results of analysis on the pine flat dam are presented finite element analysis performed to examine the distribution of driving.
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