The seismic behavior of concrete faced rockfill dams built in narrow canyons. Dynamic analysis of concrete faced rockfill dams considering dam foundation interaction effects mazda irani, department of civil and environmental engineering, university of alberta, edmonton, alberta, canada abstract many engineers commonly design concrete faced rockfill dams cfrd without considering earthquake ground motions. Cooby dam is a 32 m high concretefaced rockfill dam constructed in the 1930s. Study and monitoring the construction of a concrete face rockfill dam cfrd andre serrano instituto superior tecnico av. Cfrd dams, earthquakes, plasticity, seismic analysis. The concrete faced rockfill dam cfrd was used with increasing frequency in recent years, in many parts of the world. Twelve chapters provide specialist information on concepts, desig.
A crosssection of an embankment dam shows a shape like a bank, or hill. Guide for design and construction of concrete face rockfill dam draft cfrd international society hereby organized cfrd experts from relative countries for comprehensive summing up the experiences of constructions of world concrete face rockfill dam cfrd and studied the technical problems occurred recent years in the constructions of world high and very high cfrds. It is noted that the direction of wave propagation forms a small angle with. Dec 30, 2017 concrete faced rockfill dams cfrd and rollercompacted concrete rcc gravity dams are the primary choices for dam construction due to the ease and speed of construction. Department of civil engineering, university of thessaly, volos 38334, greece email. Numerical analysis of concrete faced rockfill dams using gradient plasticity dakoulas, p. The intuitive use by knowhow in rock blasting works led oftenly to the construction of timber face rockfill dams, to store water for the sluicing operations. It is typically created by the placement and compaction of a complex semi plastic mound of various compositions of soil, sand, clay, or rock. Concrete face rockfill dam compared to roller compacted. Pdf concrete face rockfill dams cfrds are considered to be fundamentally safe, especially against leakage, and to be a lowcost alternative at many. Concrete faced rockfill dams, stress, settlement, finite element. Based on the improved ga, a mathematical model was established for the design optimization of cfrd. Request pdf rockfill modulus and settlement of concrete face rockfill dams a method is presented for estimating the modulus of compacted rockfill in dams based on the particle size, unconfined.
A numerical procedure for the preliminary estimation of the earthquakeinduced settlement of concrete face rockfill dams is presented. Most have a central section or core composed of an impermeable material to stop water from seeping through the dam. Concrete face rockfill dams presents the stateoftheart of dam design and construction. The three dams are built in narrow canyons having an aspect ratio equal to lh2. In recent years, more than 50 high rockfill dams, including earth core rockfill dams ecrds, asphalt core rockfill dams acrds and concrete faced rockfill dams cfrds, have been constructed in china, as selectively listed in table 1. The treatment of the rock underneath the plinth and the injection of the grouting curtain deserve a careful analysis and specific attention for its realization. Concrete faced rockfill dams cfrd and rollercompacted concrete rcc gravity dams are the primary choices for dam construction due to the ease and speed of construction. Cfrd utilizes dam cost as objective function and dam slope and geometries of the dam material partition as design. Discussion of fortuna concrete face rockfill dam by d.
The concrete slab acts as an impervious membrane and any development of cracks in the slab would allow for water to penetrate the rockfill of the dam and cause the structure to weaken or even loose stability. Concrete face rockfill dams cfrds are gaining a worldwide recognition as the most. Conrete face rockfill dams figure 1 shows a typical cross section of the concrete face rockfill dams. Rockfill modulus and settlement of concrete face rockfill. Since a number of cfrds have been constructed comprising compacted rockfill, with a semipervious filter grading face zone, monolithic face slab, dowelled and grouted toe slab plinth, and multiple water stop perimeter joint. Asphaltic concrete face rockfill dams are those in which this material is used as the impervious element. An empirical method for predicting postconstruction. The zoning boundaries between the upstream and downstream rockfill zones of the three dams mentioned above inclined toward the downstream with slope gradients ranging from 1.
Toe of dam is the junction of the downstream face of a dam and the natural ground surface, also referred to as downstream toe. China, the tallest 233 m concrete face rockfill dam in the world. Concrete face rockfill dams 1985 edition open library. Nowadays, concrete faced rockfill dam cfrd is preferred among dam consultant due to its advantages. Design optimization of a concrete face rockfill dam by. The inherent features of concrete face rockfill dams and the tr end of building higher dams have been recently questioned by three recent incidents where major dams have experienced significant cracking in the central portion of the dam after the first filling. A general designation of a type of dam body filled with rockfils or gravels compacted in layers, and also with its face slab as a antiseepage system.
The load of water and deformations of the rockfill of the dam, force concrete slab to deform. Concrete face rockfill dams download ebook pdf, epub, tuebl. Keywords concrete faced rockfill dam, sequential impoundment process, nonlinear finite element method, horizontal and vertical deformation 1. Roller compacted concrete dam i examensarbetet kallat rccd och en concrete face rockfill dam i examensarbetet kallat cfrd. Guidelines for design of dams table of contents section title page preface to the january 1 1989 edition 1 introduction 2. Zhou j, yang z, editors proceedings of the 2014 symposium on safety research on concrete face rockfill dam and the technical progress of softrock damming. Missouri university of science and technology scholars mine. Sfriso 2008 numerical assessment of the deformation of. If it is greater than it, it requires that no concrete dam. Concrete slabs, supported and stabilized by the underlying rockfill materials, are connected with the toe plinth by the peripheral joints, so as to form an impermeable system. A concrete face rockfill dam cfrd is a type of dam widely used in hydropower projects all around the world. The displacements of the concrete face during the reservoir filling should not exceed the maximum allowed values in order to maintain the structural integrity of the concrete face. Rockfill dams are a kind of dam that combines porous yet firmly packed gravel, sand, or silt in one section with an area of concrete, metal, clay, or some other substance that completely blocks water.
Concrete dam was required edges abutment and a good foundation condition which to consist a 3 fix points and 1 fee end structure. Gravity dam is constructed of concrete andor masonry andor laidup. The large majority of impervious membranes are of cement concrete which is dealt in this study, followed by asphaltconcrete, which has been used on many dams up to medium heights. Concrete face rockfill dams cfrds are gaining a worldwide recognition as the most economical type of dams to be constructed in extreme northern and subantarctic regions. The presentation of the authors names and or special characters in the title of the manuscript may differ slightly between what is listed on this page and what is listed in the pdf file of the accepted manuscript. West seti dam, 190 m in height in nepal kenneally and al. Numerical simulation of impoundment process of concretefaced. Concrete face rockfill dam compared to roller compacted concrete dam a case study of dam constructions in panama master of science thesis in the masters programme geo and water engineering tom karlsson and jonas tallberdepartment of civil and environmental engineering division of water and environmental technology. Cooby dam is a 32 m high concrete faced rockfill dam constructed in the 1930s.
A reinforced concrete slab is then constructed at the upstream face of the dam. Concrete face rockfill dams download ebook pdf, epub. Numerical simulation of dynamic centrifuge tests on concrete. Performance of extrahigh concrete faced rockfill dams the number of concrete faced rockfill dams continues to increase worldwide, due to their significant advantages, such as their adaptability to topographical and geological conditions and to rainy or even harsh climate, the smaller. The opposition to large dams and especially mega hydros has, however, spurred development planners into considering more seriously proposals for small, mini, and micro hydro projects that would mostly tap the natural run of rivers.
Concrete faced rockfill dams in china 10 september china now has 39 concrete faced rockfill dams in operation. Design optimization of a concrete face rockfill dam by using. The reader is directed to fema 333, federal guidelines for dam safety. Pdf on jan 16, 2019, z erkay and others published design considerations. Pdf design considerations of concrete face rockfill dam with a. Concrete face rockfill dams 1st edition paulo teixeira da. It has a semipervious waterproof natural covering for its surface and a dense, impervious core. The accepted manuscript in pdf format is listed with the files at the bottom of this page. Keywordsconcretefaced rockfill dam, sequential impoundment process, nonlinear finite element method, horizontal and vertical deformation 1. Behavior of very tall concrete faced rockfill dams during impoundment.
Behaviour of concrete face slab leakage water resulting from cracking can easily be discharged by the freedraining rockfill downstream of. Abutments and foundation have to resistance high stress zone as shown in figure 1. Safety of cfrds depends on the proper design, construction, and monitoring of actual behaviour during the construction and during. Rock filled or soil filled dams are considered to contruct on wide valleys. The design details of concrete faced rockfill dams cfrds have depended extensively on empirical relations and experience. The writers discuss and give opinions on the main details of design and construction for the concrete. Geotextiles in embankment dams iv management agency fema has a hazard classification system that is clear and succinct, and this system was adopted for the purposes of this document. This is the category for concreteface rockfill cfrd dams. Concrete face rockfill dams cfrds are becoming a widely used type of rockfill. The concretefaced rockfill dam cfrd was used with increasing frequency in recent years, in many parts of the world.
The construction of cfrd involves placing the highergrade rock at the dam core, and compacting them to their maximum strength. The concept of a rockfill dam with an impervious face dates from the california gold rush of the 1860s and 1870s 1. Introduction rockfill has been used in the construction of dams for over 150 years 1. Concrete face rockfill dams, 2010, 406 pages, paulo. Concrete faced rockfill dams cfrd have been widely used for multipurposes over the world. This site is like a library, use search box in the widget to get ebook that you want. If height is available, contruction gravity dams is feasible alley factor k, economic limit for concrete dam 5 in america.
Technical progress on researches for the safety of high. The montesinho dam is located in the sabor river in the montesinho natural reserve. Pdf a case study on the postconstruction deformation of concrete. Utilizing fiber reinforced concrete as the concrete face of rockfill dams vol.
The purpose of this code is to provide guidance to the word cfrd builders to construct high cfrds successfully. Asphalt concrete faced rockfill dammapping and condition assessment of the upstream impervious layer. Guidelines for design of dams table of contents section title page preface to the january 1 1989 edition 1 introduction 2 2 definitions 3 3 hazard classification 5. The number of concrete faced rockfill dams continues to increase worldwide, due to their. Concrete face rockfill dam draft cfrd international society hereby organized cfrd experts from relative countries for comprehensive summing up the experiences of constructions of world concrete face rockfill dam cfrd and studied the technical problems occurred recent years in the constructions of world high and very high cfrds, and presented. Concrete face rockfill dams 1st edition paulo teixeira. This consulting guide presents details and analyses of twentyeight large crfd dams worldwide, including the highest dam in the world. Concrete face rockfill dam compared to roller compacted concrete dam. Seismic responses of high concrete face rockfill dams. Design considerations of concrete face rockfill dam with a high cutoff. Seismic analysis of concrete face rock fill dams 665 of simplified procedures or the equivalent linear. Numerical analysis of concrete faced rockfill dams using.
Oct 16, 2016 this standard is revised according to requirement of notice aboutpreparation of industry standards and project plan in 2005 by general office of the national developmentand reform commissiondocument with reference no. Cfrd utilizes dam cost as objective function and dam slope and geometries of the dam material partition as design variables. The section of compacted granular soil helps slow the flow of water while the impervious zone provides strength and stability. In this presentation, the seismic assessment of both types of dams is going to be investigated focusing on the critical issues pertaining to the safety of each structure. A study on concrete faced rockfill dams usq eprints.
This standard is revised according to requirement of notice aboutpreparation of industry standards and project plan in 2005 by general office of the national developmentand reform commissiondocument with reference no. The nn2 concrete face rockfill dam cfrd has the lowest foundation level at masl and the crest elevation at masl, which corresponds to the. Guide for design and construction of concrete face. For a m high cfrd constructed of most rock types, acceptable performance can be predicted. Pdf utilizing fiber reinforced concrete as the concrete.
Dams in the cordillera the river systems of the cordillera. The method is based on a simple constitutive model that accounts for. During the reservoir filling, the load of the water and deformations of the dam rockfill, force upstream concrete slab to deform. It is hereby to formulate this draft for high concrete face rockfill dam design code. With rapid population growth and accelerating economic development, much of the worlds water which requires urgent attention to ensure sustainable use. Uses, application, and considerations of a rockfill dam. Placing the rockfill embankment in stratified layers, with the larger. Reinforced concrete slabs replaced timber as the impervious element for higher and permanent dams in. Empirical relations may become insufficient, however, as the height of the dam increases, or when geometric complexities are involved and coupled with complex loading conditions such as seismic loads. Numerical simulation of impoundment process of concrete. Challenges can be seen from both the height of these dams and the thickness of the overburden layers.