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2005 | Vol. 27, nr 3-4 | 121-132
Tytuł artykułu

CPTU in soft post-flotation sediments

Warianty tytułu
Konferencja
Proceedings of the 2nd International Workshop on " Interpretation of in situ tests and sample disturbance of clays"
Języki publikacji
EN
Abstrakty
EN
The history of copper ore mining in the Lower Silesia, a region in south-west Poland, goes back to the XIX century when the first shafts were bricked off. Since that time the industry has been continuously developed up to this day. One of the most important event in its history, i.e. establishing of KGHM Polska Miedź S.A., the managing company being now ranked as the seventh largest copper supplier and the second of silver supplier in the world took place in 1961. Unfourtunately, only 5% of mineral product includes copper ore; the remaining part is from the technological point of view completely useless. Mineral wastes – this is a proper name – are very specific kind of soil. Although at first sight they strongly resemble natural soil, they are in fact a man-made material being a by-product of technological process in which the metal-bearing rock is crushed to small fractions, varying from fine sand to clay particles. This posed a serious problem of mineral waste deposition, the solution of which turned out to be post-flotation sediment dumps. Of six dumps in the region, the newest is the reservoir of Żelazny Most, located between Lubin and Głogów. Started in 1977, today of the height exceeding locally even 45 m, the diameter of approximately 5 km, the length of dams over 14 km and accumulation capacity of 350 million m3 it is the biggest hydrotechnical construction in the world. Taking advantage of water, the crushed rock is sent to the reservoir through a wide net of pipelines. This transport method allowing dumping of the waste material is responsible for a significant variability of not only its grain-size distribution, but also of its physical parameters which affects the drainage conditions. Because of the complexity of the Żelazny Most project, several scientific centers and institutes both from all over the Poland and Europe (e.g. Norwegian Geotechnical Instuitute) have been involved in its supervision; moreover, International Experts' Board - an advisory body - was also established. Due to their efforts, the CPTU test was decided to be a reliable method of assessing current effective stress conditions. However, it soon became clear that interpretation of the data on artificial soils such as mine tailings had to be improved to some extent. Because of their special character, local correlations between penetration characteristics and shear strength parameters or deformations characteristics of post-flotation deposits should be found.
Słowa kluczowe
Wydawca

Rocznik
Strony
121-132
Opis fizyczny
Bibliogr. 11 poz.
Twórcy
  • Department of Geotechnics, The August Cieszkowski Agricultural University of Poznań, 60-623 Poznań, ul. Mazowiecka 26, Poland.
Bibliografia
  • [1] EASR D.R., ULRICH B., The electric piezocone for profiling of mine testing, Engineering Geology and Geotechnical Engineering, 1989, Balkema, Rotterdam,
  • [2] LA ROCHELLE P., ZEBDI P.M., LEROUEIL S., TAVENAS F., VIRELY D., Piezocone tests in sensitive clays of eastern Canada, International Symposium on Penetrating Testing ISOPT-1, Orlando, 1988, Balkema, Rotterdam.
  • [3] LUNNE T., KLEVEN A., Role of CPT in North Sea Foundation Engineering, Norwegian Geotechnical Institute, Oslo, 1982, Publication No. 139,
  • [4] LUNNE T., CHRISTOPHERSEN H.P., TJELTA T.I., Engineering use of piezocone data in North Sea Clays, Proc. of Internatinal Conference on Soil Mechanics and Foundation Engineering, San Francisco, 1985,
  • [5] LUNNE T., ROBERTSON P., POWELL J., Cone Penetrating Testing in Geotechnical Practice, E & FN Spon, London, 1997.
  • [6] MŁYNAREK Z., TSCHUSCHKE W., SULIKOWSKA I., WERNO M., Predicting the strength parameters of the post flotation sediments using the CPT method, Field Measurements in Geotechnics, 1991, Balkema, Rotterdam.
  • [7] MŁYNAREK Z., TSCHUSCHKE W., LUNNE T., SANGLERAT G., Concerning classification of post flotation sediments with CPTU method, Mécanique des sols appliquée, VI Colloque Franco-Polonais, 1993, Douai, France.
  • [8] SENNESET K., JANBU N., SVANO G., Strenght and deformation parameters from cone penetration test, 2nd European Symposium on Penetrating Testing, Amsterdam, 1982.
  • [9] SENNESET K., SANDVEN R., JANBU N., Evaluation of soil parameters from piezocone tests, Transportation Research Board, National Research Council, Washington D. C., 1989.
  • [10] TANAKA Y., SAKAGAMI T., Piezocone testing in underconsolidated clay, Canadian Geotechnical Journal, 1989, Vol. 26, No. 4.
  • [11] TSCHUSCHKE W., MŁYNAREK Z., MASSOLT P., The use of CPT test for density determination of an embankment constructed from post flotation sediments, Proc. of International Conference on Construction on Polluted and Marginal Land, London, 1992.
Typ dokumentu
Bibliografia
Identyfikatory
Identyfikator YADDA
bwmeta1.element.baztech-article-BAT6-0008-0015
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