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    Wyświetlanie 1-5 z 5
    Tytuł:
    Laboratory investigations of compressibility of coarse-grained coal-mining wastes
    Autorzy:
    Dzierwa, K.
    Zawisza, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/241138.pdf
    Data publikacji:
    2007
    Wydawca:
    Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
    Tematy:
    anthropogenic soils
    colliery spoils
    compressibility
    middle-size oedometer tests
    Opis:
    Coal-mining wastes are used for engineering purposes mainly as a building material for hydraulic and road embankments, as well as land levelling. Determination of compressibility and shear strength parameters is indispensable to determine the usefulness of coal-mining wastes for the above mentioned purposes. Due to the coarse-grained character of minestone, testing their geotechnical parameters should be conducted in situ (test loads) or in the laboratory in medium and large-size apparatus. The paper presents results of compressibility tests on unburnt coal-mining waste from Anna mine in the Upper Silesian Region. They were carried out in a prototypical medium-size oedometer (h = d = 374 mm), constructed in the Geotechnical Laboratory of the Department of Soil Mechanics and Earth Structures, Agricultural University of Kraków. The tests aimed at the determination of the influence of compaction and saturation of coal-mining wastes on the process of their consolidation, as well as on the magnitudes of settlement and compression moduli. Initial moisture content of the samples (close to the optimum one) was constant and compaction index changed (from IS = 0.88 to IS = 1.00); some samples were saturated prior to the loading. As a result of the tests, it was found that the slightly compacted wastes (IS = 0.90) are significantly susceptible to saturation, whereas more compacted wastes (IS = 0.95 and 1.00) are insignificantly susceptible to it. High compaction of coal-mining wastes has significant influence on the more even course of consolidation process and decrease of settlement. It is essential in case of using wastes for construction of embankments, especially those which are subject to the influence of water, for example embankments of ash ponds or flotation slurries. In that case the wastes should be compacted to the maximum extent at the optimum moisture content.
    Źródło:
    Archives of Hydro-Engineering and Environmental Mechanics; 2007, 54, 1; 37-54
    1231-3726
    Pojawia się w:
    Archives of Hydro-Engineering and Environmental Mechanics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Technical note: Stability of a levee made of bottom sediments from a dam reservoir
    Autorzy:
    Koś, K.
    Zawisza, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/178768.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    bottom sediments
    hydraulic embankments
    stability
    Opis:
    Stability analysis of a levee made of the bottom sediments from Czorsztyn-Niedzica Reservoir is presented in the paper. These sediments were classified as silty sands and, based on the authors’ own research, their geotechnical parameters were beneficial, so the possibility of using this material for the hydraulic embankments was considered. Stability and filtration calculations were carried out for a levee that had the same top width – 3 m, slope inclinations 1:2 and different heights: 4, 6 and 8 m. Two methods were used: analytical and numerical. Calculations were carried out without and with a steady and unsteady seepage filtration. Based on the analysis carried out it was stated that the levee made of the bottom sediments is stable even at the height of 8.0 m, although because of the seepage on the downstream side it is recommended to use a drainage at the toe of the slope.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 4; 65-70
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Algal and invertebrate microfossil assemblages from lake sediments in the reconstruction of past community dynamics - preliminary information
    Autorzy:
    Antipushina, Z.
    Szeroczyńska, K.
    Zawisza, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027085.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    lake sed i ments
    subfossil Cladocera
    subfossil phyto- and zoo-or gan isms
    thanatocoenosis
    Late Ho lo cene
    Opis:
    This pa per fo cuses on the use ful ness of a palaeolimnological method called the joint algological and zoo log i cal anal ysis. The joint algo-zoo log i cal anal y sis in volves count ing all iden ti fi able re mains of the main al gae groups (Bacillariophyta, Cyanophyta, Desmidiales, other Chlorophyta, Trachelomonas sp.) and in ver te brate groups (Cladocera, Ostracoda, Chironomidae, Chaoborus sp., and other in sects, Turbellaria, Bryozoa, Spongia and Testacida) in vol u met ric sam ples. We pres ent re sults from re cent sed i ments of Lake Glubokoe (Mos cow re gion, Rus sia) as an ex am ple of the ap pli ca tion of this method. We re con struct the struc ture of phytoplankton, zoo plank ton and zoobenthos com mu ni ties and their dy nam ics over the last 25 years. Our re sults sup port the va lid ity of this method in the re con struc tion of the struc ture of phyto- and zoo plank ton com mu ni ties and their dy nam ics, in for ma tion that may be lost when car ry ing out sep a rate anal y ses for in di vid ual groups. Sim plic ity is an other ad van tage of this meth od ol ogy.
    Źródło:
    Studia Quaternaria; 2012, 29; 53-58
    1641-5558
    2300-0384
    Pojawia się w:
    Studia Quaternaria
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Problem jednoznacznego ustalenia parametrów wytrzymałości na ścinanie odpadów powęglowych i poenergetycznych
    The Problem of Unequivocal Determination of the Shear Strength Parameters of Colliery Waste and Fuel Ashes
    Autorzy:
    Baran, P.
    Cholewa, M.
    Zawisza, E.
    Kulasik, K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1819202.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Koszalińska. Wydawnictwo Uczelniane
    Tematy:
    odpady powęglowe
    parametry wytrzymałości
    Opis:
    Previous researches conclude that coal mining waste and fly ashes are useful in many kind of engineering – especially in building of embankments. In fact that the embankments transfer self weight and external loads, determination of strength parameters is very crucial. The problem of well-determined shear strength parameters conducts to searching alternative investigation methods. In the aim of credible determination of strength parameters of anthropogenic soils, the half-back analysis have been proposing. The paper presents the results of two investigation method: direct shear and limit bearing capacity analysis of slope models. Results of the tests were combined together, for verification of a relationship between shear strength obtained during laboratory tests and possibility slope failure to be initiate in embankment models made of the waste materials. In consequence of the methods combination and apply of some indexing factors into analysis, a real values of the shear strength were obtained in a specific working conditions. Proposed indexing factors can be use to examine what strength parameter, determined using direct shear test, have to be modify. In the analysed waste materials incorporated into embankments treated by braking load, the shear strength parameters determined in direct shear apparatus used for stability analysis, did not confirm stability failure phenomena what has occurred. Investigation of shear strength parameters of coarse minestone waste material in direct shear box apparatus overstate in significant way the value of cohesion. In case of fine size fly ash, the direct shear box test overstate the value of friction angle. It has to be postulated in attention of earth structure safety exploitation, the strength parameters of anthropogenic soils should be determine in real work conditions. If it is not possible, the laboratory tested strength parameters should by modify using tests simulating real work condition of the structure. A testing method used for obtaining the shear strength parameters of coarse and fine size granular waste material, strong interacting on the boundary conditions in test. Shear strength parameters of the tested waste materials are strong associated with the loading path. In consequence, is very crucial what are the work and test conditions of the material.
    Źródło:
    Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2071-2089
    1506-218X
    Pojawia się w:
    Rocznik Ochrona Środowiska
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Environmental changes during the last millennium recorded in subfossil Cladocera, diatoms and sediment geochemistry from Lake El Sol (Central Mexico)
    Autorzy:
    Zawisza, E.
    Cuna, E.
    Caballero, M
    Ruiz-Fernandez, A. C.
    Szeroczyńska, K.
    Woszczyk, W.
    Zawiska, I.
    Powiązania:
    https://bibliotekanauki.pl/articles/2060339.pdf
    Data publikacji:
    2017
    Wydawca:
    Państwowy Instytut Geologiczny – Państwowy Instytut Badawczy
    Tematy:
    crater Nevado de Toluca
    lake sediments
    tropical alpine lake
    palaeolimnology
    last millennium
    Opis:
    High-altitude lakes, which are very sensitive ecosystems and respond rapidly to climatic changes, are one of the best targets for palaeolimnological studies. Here, we present the record of environmental changes over the last millennium that are recorded in the sediments of El Sol, a tropical, high-altitude, volcanic crater lake on the Nevado de Toluca, Central Mexico. Palaeolimnological reconstructions are based on subfossil Cladocera, diatoms, magnetic susceptibility and chemical analysis of the sediments. In general, Cladocera occurring in tropical regions, and especially at high altitude, have been studied very little. Our data indicate that in the sequence studied, the species diversity of subfossil Cladocera is very low. Only four species were recorded, and the assemblage is dominated by littoral species. Two Cladocera taxa, Alona manueli and Ilyocryptus, found at Lake El Sol are endemic. Cladocera, diatoms and the sediment chemistry show changes in Lake El Sol which are mostly related to climate. The most pronounced climatic signal was obtained for the early Little Ice Age (1350–1625 AD). This cold episode was expressed by a reduction in the frequency of zooplankton (individuals/cm2/yr) and diatoms (valves/g of dry sediment) and by changes in the organic carbon content in the sediment. Our results show that human activity was very limited throughout the study period. According to historical data the presence of humans at the lake shore was mostly occasional, usually for ceremonial and ritual purposes, and humans did not have an important influence on the lake ecosystem. Only one period was identified when human activity was important. This period corresponds to the introduction of fish into the lake at the beginning of the 20th century.
    Źródło:
    Geological Quarterly; 2017, 61, 1; 81--90
    1641-7291
    Pojawia się w:
    Geological Quarterly
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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