Geotechnical instrumentation in earth and rockfill dams mauriya, vinod kumar senior engineer fes email. A rockfill dam is built of rock fragments and boulders of large size. In rockfill dams, instead of providing impervious core, an impervious membrane on the upstream face is also adopted. Analysis of observation data of earthrockfill dam based. 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. Although several different definitions of earthfill and rockfill dams are used by various authors and organizations. Such loose cohesionless soils are potential sources of failures and are real hazards in hydraulic dam construction. Performance of san fernando dams during 1994 northridge earthquake article pdf available in journal of geotechnical engineering 1227. This paper presents the dynamic analysis executed in an earth and rockfill dam for a tailings facility located in southeast peru. Thousands of embankment dams exceeding 20 meters in height have been constructed throughout the world. Materials available within short haul distances are used, the embankment dam can accommodate a variety of foundation conditions, and. Currently, the dam is at an elevation of 4475masl, with a maximum height of 75m and a crest length of 342m, and will be raised until reaching the elevation of. The device for acquiring the state of the dam material transport vehicle of the earth and rockfill dam can acquire the state information of the dam material transport vehicle of the earth and rockfill dam in real time so. This consulting guide presents details and analyses of twentyeight large crfd dams worldwide, including the highest dam in the world.
The materials are usually excavated or quarried from the surrounding area. For details regarding impervious core, is 8826 may be referred to. The tailings dam, currently more than 100 meters high,is con structed of compacted rockfill sourced from glacial outwash, quarried sandstone, and openpit waste rock, and will ultimately be raised to a height greater than 170 meters. The two main types of these dams are earthfill embankment dams and rockfill embankment dams. To be able to model this mechanism, the relationship between the hydraulic gradient and the flow velocity for the coarse rockfill material must be. In this video we will see what is the specification of rock fill embankment. Seismic analysis of an existing earth and rockfill dam. A selfspillway rockfill dam excessive head of water in the reservoir is relieved totally by flow through the rockfill.
Design of a centerline method tailings dam using mine. In order to assess the potential for an unraveling failure of flowthrough rockfill dams, a systematic study of the hydraulic design of these structures was conducted and the nonlinear nature of flow through these structures was dealt with using a. Rockfill dam, a kind of embankment or socalled earthrock dams, is a water retaining barrier composed of three major parts. Cn101950473a device for acquiring state of dam material. Material for rockfill and bedding shall be obtained from the specified sources unless otherwise. Geotechnical instrumentation in earth and rockfill dams.
Deformation of the nam ngum 2 concrete faced rockfill dam. Guide for design and construction of concrete face. A rockfill dam can be very economical to build because materials can be acquired locally. The construction of cfrd involves placing the highergrade rock at the dam core, and compacting them to their maximum strength. Pdf a practical method for estimating the shear strength of rockfill is developed. The construction of earth dams by hydraulic means was curtailed in the 1940s due to economic. Rao, scientist c, central soil and materials research station, new delhi110016 email. Rehabilitation design of acciano rockfill dam after the. A reinforced concrete slab is then constructed at the upstream face of the dam. Monitoring of dam behaviour was done by 390 sensors with data acquisition system. The dam comprises an initial downstreammethod rockfill embankment with sloping upstream core and chimney. Earthfill dams are made up mostly of compacted earth. Nam ngum 2 is one of the world ranked concrete face rock fill dam cfrd in lao pdr.
The balance small business uses and application of a rockfill dam. In early rockfill dams, steel and timber membrane were also used, but now they. Fell eppalock dam during remedial works in 1999 photo courtesy of goulburn murray water. 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. The period from 1850 to 1940 is called the early period by cooke 1984. The general principles presented herein are also applicable to the design and construction of earth levees.
Twelve chapters provide specialist information on concepts, desig. Material for rockfill and bedding shall be obtained from the specified sources unless otherwise specified in. Concrete face rockfill dams presents the stateoftheart of dam design and construction. The leakages produced were easily accommodated by the internal rockfill and so the dams were not in structural danger. Embankment dams the foundation are rarely known with any degree of accuracy, and methods for predicting the degree of stress transfer between various zones of an embankment or an embankment and its foundation are subject to debate.
With the developments in dam engineering and the technology used, concrete faced rockfill dams cfrds became popular in recent years, especially in the regions with a shortage of impervious soils. Reworking the shell also tends to reduce the loose structure which often develops when fine sands are deposited out of water. The new harvey dam replaced the existing upstream harvey weir, which remained in operation during construction of the new dam. The rockfill body of an upstreamfaced rockfill dam is inherently stable. Draft 4 introduction the origin of rockfill dams can be traced back to the mining region of california sierras, in the 1850s. Uses, application, and considerations of a rockfill dam.
This manual presents fundamental principles underlying the design and construction of earth and rockfill dams. Concrete face rockfill dam compared to roller compacted. Unravelling and instability of the downstream slope, initiated by internal erosion and leakage through the dam core, is one of the most likely breach mechanisms for large, zoned embankment dams. The membrane is usually made of cement concrete or asphaltic concrete.
The dam the acciano rockfill dam is located in the centre of italy perugia province. An impervious membrane is placed on the rockfill on the upstream side to reduce the seepage through the dam. Factors influencing the stress conditions, the strength and compressibility properties of the embankment materials, and the. 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. Complex site geology determined a change in embankment type from earthcore rockfill to earthfill, part. Department of natural resources division of water indianapolis, indiana. The invention discloses a device for acquiring the state of a dam material transport vehicle of an earth and rockfill dam, which relates to the field of hydraulic engineering. Commonly used drainage features inside the body of the dam. Rockfill dams were of the impervious face type, constructed by dumped rockfill, until earth core dams began to be developed in about 1940. Earth and rockfill dams 4th year civil engineering department suez canal university types of earth dams depending upon the method of construction. The dam height can easily be increased by adding more rocks. Increasing freeboard or designing the spillway for the passage of larger flood flows. Click to add title bastelos a selfspillway rockfill dam. In fact, these type of dams have been built all over the world for almost 150 years.
577 1075 1179 351 491 721 513 20 576 84 200 997 1267 1454 103 1350 1066 271 1192 381 939 610 662 833 838 290 835 1234 389 144 712 535 830 1108 1508 829 999 406 151 1172 72 305 1308 884 1265 1113 1453 844 616