Pdf behavior of concretefaced rockfill dams during initial. It has a semipervious waterproof natural covering for its surface and a dense, impervious core. The model applied in this study adopts the technique of element birth and death to simulate the sequential impoundment process of concretefaced rockfill dam with time. A semiempirical relationship for predicting earthquake. However, its type was revised to concretefaced rockfill type, as a result of intensive geotechnical. Pdf a case study on the postconstruction deformation of concrete. Numerical simulation of impoundment process of concrete.
Many of the manuscripts are available in pdf format to be viewed with acrobat. Concrete faced rockfill dam how is concrete faced rockfill dam abbreviated. Concrete face rockfill dams design, construction, and performance. Determination of nonuniform input ground motion for high. International journal of distributed dynamic responses of. Geotechnical aspects and seismic damage of the 156mhigh.
For the mao pin xi dam, under construction in china three gorges project, the alternatives were an. Design principles adopted in 1966 by the hydroelectric commission have been applied to nine concrete faced rockfill dams and remain substantially unchanged. Download citation compaction characteristics of zone1 material in concrete faced rockfill dam bedding zone in crfd concrete faced rockfill dam requires bearing capacity to support the. Guidelines for design of dams table of contents section title page preface to the january 1. Cooby dam is a 32 m high concrete faced rockfill dam constructed in the 1930s. It was originally designed as a rockfill dam with central core. 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. Monitoring of dam behaviour was done by 390 sensors with data acquisition system. Concrete faced rockfill dams in china international. Zone designations for concrete face rockfill dam cfrd of. The parameters of constitutive relationship of stress and strain are determined by tridimensional compression test in laboratory. It has 3 m high from foundation and 300 m long on crest. Seepage simulation of high concretefaced rockfill dams based.
This paper has raised the key technical problems which need to study for construction of 300 mheightscale concrete faced rockfill dams based on the main. A concrete gravity dam is poured at an upstream end at the bottom of the concrete faced rockfill dam, the concrete faced rockfill dam is built based on the gravity dam, and the gravity dam is a rigid body without horizontal displacement relatively. Mitigation measures evaluation for concrete faced rockfill dams. Concrete faced rockfill dams have evolved to a stage where the main elements are common, and a typical cross sections of a cfrds with sound rockfill on bedrock and with gravel fill on alluvium are shown at left. In structural concept the buttress dam consists of a continuous upstream face supported at regular intervals by downstream buttresses. Concrete masonary dams earthfill dams rockfill dams earth and rockfill dams concrete faced rockfill dams cfrd 5 based on capacity. The deformation behavior of rockfill is significant to the normal operation of concrete face rockfill dam. Specification for concrete face rockfill dam construction prc national bureau of energy on. The concrete faced rockfill dam valley foundation was considered as an open energy system and a reasonable nonuniform seismic motion input method was applied to the dynamic analysis of a concrete faced rockfill dam based on the generalized plastic model. Zone 2 support the concrete faces processed granular materials. Seismic analysis of the zipingpu concretefaced rockfill dam response to the 2008 wenchuan, china, earthquake. The outer slopes both upstream and downstream are 1,4. International journal for numerical and analytical methods in geomechanics 40. It is typically created by the placement and compaction of a complex semiplastic mound of various compositions of soil, sand, clay, or rock.
Concrete faced rockfill dam how is concrete faced rockfill. Pdf a study on concrete faced rockfill dams semantic scholar. Pages in category concrete face rockfill dams the following 115 pages are in this category, out of 115 total. This consulting guide presents details and analyses of twentyeight large crfd dams worldwide, including the highest dam in the world. An empirical method for predicting postconstruction. Cooby dam is a 32 m high concretefaced rockfill dam constructed in the 1930s. Click download or read online button to get concrete face rockfill dams book now. Cfrd international society foreword the concrete face rockfill dam cfrd has been constructed widely all over the world now its stability, taking full advantage of local excavated materials and constructed simply, and economically, and best adaptability to geology and. Experimental studies by janbu have shown that the relationship between initial tangent modulus and confining pressure may be expressed as. Experience shows that the availability of rock foundations for the plinth or upstream toe slab is almost the sole prerequisite for this type of dam.
A number of rockfill dams and concrete faced rockfill dams. A generalized equivalent continuum model of fractured rock mass was used for equivalent continuous seepage field analysis based on the improved node virtual flow method. Besides the rockfill embankment and the concrete curtain cfrds. Most have a central section or core composed of an impermeable material to stop water from seeping through the dam. Also included in the design were a grout curtain in the foundation, an inclined reinforced concrete tower with outlet pipework through a tunnel on the right abutment originally part of the diversion works and. Concrete faced rockfill dams cfrd have been widely used for. China now has 39 concrete faced rockfill dams in operation.
Structural design measures for a 93 m high concrete. However, its type was revised to concrete faced rockfill type, as a result of intensive geotechnical. Cao keming and zhuang wenzhong discuss the design and construction of these dams chinas first concrete faced rockfill dam cfrd was at kekeya. Dec 20, 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. Asphalt concrete cores for embankment dams international. Pdf construction of concretefaced rockfill dams with weak. Construction of concretefaced rockfill dams with weak. Chinas cfrds are designed in accordance with the design guide for concrete faced rockfill dams 1993, and design code for design of concrete faced rockfill dams 1999, both of which were approved and published by the state power corporation of china and the ministry of water resources.
Particle flow code pfc simulation is analyzed based on the shaking table test, which overcomes the deficiency of macrocontinuity assumption in continuum mechanics and can demonstrate the. The results of the study serve also as a basis for designing deformation monitoring schemes for. Described is the computation analysis of the concrete face rockfill dam under static. Rcc, concrete faced and asphalt concrete core dams. Concrete dam engineering 1 0401544 hydraulic structures university of sharjah dept. The latter was chosen due to cost and because the dam was located in an earthquake region on a poor sandstone foundation. The concept of a rockfill dam with an impervious face dates from the california gold rush of the 1860s and 1870s 1. This article considers only the single factor of overburden thickness. Pdf constructing concretefaced rockfill dams cfrds with weak rocks has great advantages as a result of the use of local materials. Pfc simulation on shaking table concretefaced rockfill. Concrete faced rockfill dams cfrds are an effective and commonly used type of dam. Tested materials were obtained from the locations of a number of concrete faced rockfill.
Parameter sensitivity and inversion analysis for a. Concrete faced rockfill dams, cfrd, is a term used to describe a certain type of dams that is composed by a rockfill embankment with a waterproofing upstream reinforced concrete curtain. A reinforced concrete slab is then constructed at the upstream face of the dam. Deformations of concrete face rockfill dams cfrds resting. Keywords concrete faced rockfill dam, sequential impoundment process, nonlinear finite element method, horizontal and vertical deformation 1. The following paper discusses the principal aspects of the design and construction of the concrete membrane for the messochora dam in greece. Threedimensional numerical analysis of concretefaced rockfill dam using dualmortar finite element method with mixed tangential contact constraints.
Nam ngum 2 is one of the world ranked concrete face rock fill dam cfrd in lao pdr. However, the shape and geological conditions of overburden have an impact on the rockfill dam, both of which will be investigated in subsequent studies. Pdf construction of concretefaced rockfill dams with weak rocks. This paper summarizes the main technical points related to 100 mheightscale concrete faced rockfill dams and analyzes the main problems and their causes occurring during construction of 200 mheightscale concrete faced rockfill dams. Concrete faced rockfill dams in china international water power. The messochora dam is a concrete faced rockfill dam of height 150 m and crest length 350 m constructed between 1992 and 1995. Mitigation measures evaluation for concrete faced rockfill. Concretefaced rockfill dam cfrd is a type of embankment dam that is being widely used and rapidly developed.
Constructing concretefaced rockfill dams cfrds with weak rocks has great advantages as a result of the use of local materials, costeffectiveness, extensive adaptability, simple construction, and short construction period. Specification for concrete face rockfill dam construction. According to incomplete statistics, by the end of 2012, 445 cfrds had been built that were taller than 30 m, of which 17 are higher than 150 m. Considering both the nonlinear mechanical behavior and longterm rheological deformation, the e.
Seepage control in a high concrete facerock fill dam based on the node virtual flow method. Computation analysis of concrete face rockfill dam under static. Deformation of the nam ngum 2 concrete faced rockfill dam. Compaction characteristics of zone1 material in concrete. Seismic analysis of concrete face rock fill dams 665 of simplified procedures or the equivalent linear analysis in combination with newmarks sliding block analysis of slopes produces a safe design. This paper summarizes the main technical points related to 100 mheightscale concrete faced rockfill dams and analyzes the main problems and their causes. Analysis of transient response of saturated porous elastic soil under cyclic loading using element free galerkin method.
However, the behaviors of cfrds constructed with weak rocks are not wellunderstood. Dec 14, 2016 chapter 6 concrete dam engineering with examples 1. Constructing concretefaced rockfill dams cfrds with weak rocks has great advantages as a result of the use of local materials, costeffectiveness, extensive adaptability, simple construction. Zones 1 were designated for soils and impervious materials. It was built on a bedrock foundation and is 75 m high and 575 m long.
A crosssection of an embankment dam shows a shape like a bank, or hill. Deformations of concrete face rockfill dams cfrds resting on soil foundation67 te and al. Concrete face rockfill dams download ebook pdf, epub. The selected dam for numerical modelling is a typical concrete face rockfill dam. Effects of dynamic properties of rockfill materials on. The construction of cfrd involves placing the highergrade rock at the dam core, and compacting them to their maximum strength. West seti dam, 190 m in height in nepal kenneally and al.
Evaluation of antiexplosion performance of shuibuya. With the development of largescale construction equipment, thinlayer rolling, squeezed sidewalls, and other technologies li, 2011, xu et al. The utility model discloses a concrete faced rockfill dam compounded with a gravity dam. Concrete face rockfill dams presents the stateoftheart of dam design and construction. Xingzheng wu maotian luan and junxia xin dalian university of technology dalian university of technology dalian 116024, liaoning province, china dalian 116024, liaoning province, china abstract. First, the corresponding program was validated by means of the scattering question of an idea. If you are interested with some codes, feel free to contact me via email or skype. Concrete faced rockfill dams cfrds zones 1a and 1b protect the upstream concrete faces usually cohesionless silt or fine sand. Timedependent deformation in high concretefaced rockfill dam and.
A method is developed in this study to determine the nonuniform input ground motion based on seismic records for the seismic analysis of high concrete face rockfill dams cfrds. The lagrangian approach was used with fluid elements to model impounded water. Concrete face rockfill dams download ebook pdf, epub, tuebl. Centrifuge tests to investigate the behavior during initial reservoir filling of a concrete faced rockfill dam cfrd with face slab stiffnesses that vary by a factor of about two are described. Evaluation of antiexplosion performance of shuibuya concrete. Guidelines for design high concrete face rockfill dam draft sponsor. Different conditions of overburden foundation have a huge impact on the dynamic response of a concretefaced rockfill dam. Pdf construction of concretefaced rockfill dams with. A strong and reliable structural body,free of uplift or internal pressure. Learning outcome after this lecture, students should be able to 1. In this study, employing a database of 19 concrete face rockfill dam cfrd cases, two prediction methods for postconstruction settlement of cfrds are presented.
Guidelines for design of dams january 1985 revised january 1989. Concrete face rockfill dams, 2010, 406 pages, paulo. Reinforced concrete slabs replaced timber as the impervious element for higher and permanent dams in. Army corps of engineers engineer manual 111022300 washington, d. 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 tallberg. Numerical simulation of impoundment process of concretefaced. The 1a material located on the face slab was specified as impervious material while zone 1b was a material, rondon type, for confining 1a material against face slab. Key technical problems of extrahigh concrete faced rockfill dam. At that the massif with inertial forces is cut off and deformation of the free. Nonlinear analysis of stress and strain of concretefaced. Constructing concrete faced rockfill dams cfrds with weak rocks has great advantages as a result of the use of local materials, costeffectiveness, extensive adaptability, simple construction. Concrete face rockfill dams design, construction, and. Pdf concrete face rockfill dams cfrds are considered to be fundamentally safe.
Dynamic responses of concretefaced rockfill dam due to. 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. Twelve chapters provide specialist information on concepts, desig. 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. 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. The shape and seismic behavior of concretefaced rockfill dams under designed seismic load are usually studied by shaking table test, dynamic centrifuge model test and finite element dynamic analysis. The concrete faced rockfill dam cfrd was used with increasing frequency in recent years, in many parts of the world.
Li, seepage field 3d finite element simulation of concrete faced rockfill dam under failure condition of vertical. This study presents earthquake performance analysis of the torul concretefaced rockfill cfr dam with twodimensional damsoil and damsoilreservoir finite element models. Introduction 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. Seepage simulation of high concretefaced rockfill dams. Threedimensional numerical analysis of concrete faced rockfill dam using dualmortar finite element method with mixed tangential contact constraints. Concretefaced rockfill dams cfrds are an effective and commonly used type of dam. 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. Analysis of overburden layer thickness influence on.
This research focused on the threedimensional 3d seepage field simulation of a high concretefaced rockfill dam cfrd under complex hydraulic conditions. 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. Seepage control in a high concrete facerock fill dam. Introduction concrete faced rockfill dams cfrds are one type of embankment dams that are built with compacted rockfill in layers or lifts and covered with concrete slabs at the upstream face as part of an impermeable. Since there is no pore water pressure which can be built in the free draining compacted rockfill, the. Request pdf on apr 9, 2015, jianmin zhang and others published geotechnical aspects and seismic damage of the 156mhigh zipingpu concretefaced rockfill dam following the ms 8. Guide for design and construction of concrete face. A study on concrete faced rockfill dams usq eprints. The papers are categorised by areas, soil reinforced structure a, concrete facedrockfill dam b, reliability c, otherfloods d, cross shore e, longshore f, flood risk g. Concrete face rockfill dam compared to roller compacted.
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