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    Wyświetlanie 1-5 z 5
    Tytuł:
    The effectiveness of deconvolution process in presence of random noise on the base of rock salt deposits from “Bytom Odrzański” area
    Autorzy:
    Kawalec-Latała, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/178555.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    złoża soli kamiennej
    pseudoimpedancja akustyczna
    dekonwolucja
    deconvolution
    rock salt deposits
    acoustic pseudoimpedance
    Opis:
    A number of synthetic pseudoacoustic impedance sections are presented in order to test the effectiveness of deconvolution process when random noise distorted the seismic traces. A simplified seismological model is created on the basis of geological data from Bytom Odrzański area in NW part of the Legnica–Głogów Copper District (LGOM). The synthetic sections are constructed for different noise levels. Acoustic impedance is one of the basic factors characterising physical features of rocks. The main idea is the inversion of seismic sections into pseudoacoustic impedance sections. All inhomogeneities of salt deposits must be predicted before the underground storage location is fixed. The accuracy and reliability of interpretation decreases when the noise in seismic data increases. It should be realised that the inversion procedure is not a unique process. So, modeling pseudoacoustic impedance sections is recommended for verification of the effectiveness of deconvolution process for the accuracy and reliability interpretation.
    Źródło:
    Studia Geotechnica et Mechanica; 2013, 35, 1; 109-118
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparison of geo-mechanical properties of white rock salt and pink rock salt in Kłodawa salt diapir
    Autorzy:
    Kolano, M.
    Flisiak, D.
    Powiązania:
    https://bibliotekanauki.pl/articles/178497.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    sól kamienna
    właściwości geomechaniczne
    wytrzymałość i odkształcalność
    właściwości reologiczne
    wysad Kłodawa
    rock salt
    geomechanical properties
    strength and strain
    rheological properties
    Kłodawa salt diapir
    Opis:
    Within the boundaries of the Salt Mine “Kłodawa”, rock-salts and potassium-magnesium salts occur at different stratigraphic levels. The present article introduces strength-strain properties of white rock salt, building the nucleus of northeastern edge anticline, and pink rock salt that belongs to the series of youngest rock salt. On the grounds of the research on strength and strain parameters (uniaxial compressive and tensile strength, triaxial shear strength, modulus of elasticity and Poisson ratio) there is presented, in the article, variation of basic parameters determining geo-mechanical properties of rock salt in Kłodawa salt diapir.
    Źródło:
    Studia Geotechnica et Mechanica; 2013, 35, 1; 119-128
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Geomechanical numerical analysis as a guidance for preservation works of the “Wieliczka” Salt Mine site
    Autorzy:
    d’Obyrn, K.
    Tajduś, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/178418.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    geomechanical analysis
    numerical modelling
    physico-mechanical rock parameters
    Wieliczka Salt Mine
    Opis:
    Salt was excavated at the “Wieliczka” Salt Mine for over 700 years. Underground mining operations terminated in 1996, by which time almost 2,400 chambers and 245 km of galleries had been created underground, situated on 9 levels and a few interlevels. In 1978, the mine was included in the UNESCO World Heritage List, which stated that parts of the mine with historical value had to be preserved for future generations. In order to preserve the most valuable chambers and galleries, activities aimed at establishing a protection pillar for excavations were conducted in the conservation area on Levels I–V. The need of large scope preserving works created the necessity to conduct a new and truly comprehensive geomechanical analysis. Such an analysis could only be done by means of advanced numerical modelling codes. Three-dimensional calculations were performed by means of FLAC 3D finite difference code. Rock mass stability assessment in the vicinity of excavations was carried out on the basis of the distribution and range of the so called failure zones. This comprehensive geomechanical analysis allows for verification and give the directions for future preservation and closure works in the “Wieliczka” mine.
    Źródło:
    Studia Geotechnica et Mechanica; 2017, 39, 2; 25-34
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Edge detection on images of pseudoimpedance section supported by context and adaptive transformation model images
    Autorzy:
    Kawalec-Latała, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/178909.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    underground storage
    acoustic impedance
    data analysis
    data visualisation
    edge detection algorithms
    rock salt
    inhomogeneity detection
    składowanie podziemne
    impedancja akustyczna
    analiza danych
    wizualizacja danych
    algorytmy wykrywania krawędzi
    sól kamienna
    wykrywanie niejednorodności
    Opis:
    Most of underground hydrocarbon storage are located in depleted natural gas reservoirs. Seismic survey is the most economical source of detailed subsurface information. The inversion of seismic section for obtaining pseudoacoustic impedance section gives the possibility to extract detailed subsurface information. The seismic wavelet parameters and noise briefly influence the resolution. Low signal parameters, especially long signal duration time and the presence of noise decrease pseudoimpedance resolution. Drawing out from measurement or modelled seismic data approximation of distribution of acoustic pseuoimpedance leads us to visualisation and images useful to stratum homogeneity identification goal. In this paper, the improvement of geologic section image resolution by use of minimum entropy deconvolution method before inversion is applied. The author proposes context and adaptive transformation of images and edge detection methods as a way to increase the effectiveness of correct interpretation of simulated images. In the paper, the edge detection algorithms using Sobel, Prewitt, Robert, Canny operators as well as Laplacian of Gaussian method are emphasised. Wiener filtering of image transformation improving rock section structure interpretation pseudoimpedance matrix on proper acoustic pseudoimpedance value, corresponding to selected geologic stratum. The goal of the study is to develop applications of image transformation tools to inhomogeneity detection in salt deposits.
    Źródło:
    Studia Geotechnica et Mechanica; 2014, 36, 1; 29-36
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The influence of the de-icing salt on the deterioration of rock materials used in monumental buildings
    Autorzy:
    Kłopotowska, A. K.
    Łukaszewski, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/178339.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    osadzanie się soli
    odladzanie
    sól drogowa
    surowce skalne
    budynki
    piaskowce
    budowle zabytkowe
    de-icing
    road salt
    rock materials
    buildings
    salt deposition
    sandstone
    Opis:
    The de-icing salt has been used for decades to increase safety on the roads and sidewalks. In Poland, mainly the sodium chloride is used in order to maintain the roads in good condition during winter. Like other salts used for surface de-icing, it depresses the freezing point to lower temperatures and has an additional thermal effect by an exothermic reaction. However, this salt causes the accumulation of chlorides in the walls and stone buildings contributing to the deterioration of these facilities. The paper addresses the issue of the influence of salt solutions on the structure and geomechanical properties of rocks at negative temperatures. The study was conducted on the basis of cyclic tests which simulate complex action of both the negative temperature and the salty environment. The conditions for the tests were chosen so as to reflect the actual conditions of the winter in Poland. During the tests, the longitudinal wave propagation velocity, changes in weights of the samples as well as visual changes were recorded which allowed continuous tracking of occurring changes. At the end of the tests, the rock samples were subjected to uniaxial compressive tests. For this purpose, four lithological types were chosen, representing the sedimentary rocks: clastic and carbonate, widely used in stone constructions.
    Źródło:
    Studia Geotechnica et Mechanica; 2013, 35, 3; 57-68
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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