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GÓRNICTWO I GEOINŻYNIERIA

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Kwartalnik wydawany przez Uczelniane Wydawnictwa Naukowo-Dydaktyczne Akademii Górniczo-Hutniczej w Krakowie od 1977 r. (do połowy 2003 r. wydawany był jako Zeszyt Naukowy Górnictwo).

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Now showing 1 - 10 of 964
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Metoda planowania i kontrolowania realizacji przedsięwzięć budowlanych: studium przypadku
    (Wydawnictwa AGH, 2011) Czarnigowska, Agata; Sobotka, Anna
    It is quite common that in the course of construction works their programmes (both schedules and cost plans) have to be adjusted to changing conditions. If plans are to be met, it is thus necessary to monitor performance to introduce necessary repair actions. Progress checks providing information useful in project control should be conducted on regular basis. The aim of the paper is to present a method used for managing projects on operations level- the Earned Value method (EV) and its extension - Earned Schedule (ES). In these methods, a set of simple indices allow the project manager to decide on further progress of works. Application of the method has been illustrated by a road works case study.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Analiza pola prędkości w wyrobiskach przewietrzanych przez dyfuzję
    (Wydawnictwa AGH, 2010) Branny, Marian; Filipek, Wiktor; Karch, Michał
    Ventilation of short blind heading caused by through road air velocity is considered. A series of numerical tests was performed to determine the effect of different through air velocities on airflow patterns. The velocities ranged between 0,65 m/s and 2,1 m/s. 3D velocity fields was calculated using a finite-volume CFD computer code FLUENT 6.1. Two turbulence models (standard k- and RNG k-) as well as two near-wall models (wall function and enhanced wall treating) were tested. Numerical results were compared with experimental data.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Wpływ parametrów ośrodka sprężysto-lepkiego na konwergencję powierzchniową prostokątnego chodnika na podstawie badań modelowych
    (Wydawnictwa AGH, 2008) Maj, Agnieszka
    Dependence of relative areal convergence and its rate on slenderness of rectangular gallery and Young modulus was presented in this paper. FEM and Cosmos/M were used to compute of displacements in elastic-viscous medium. Parabolic relation between slenderness and convergence was obtained as well as hyperbolic relation between Young's modulus and convergence. Minimum values of functions were reached for slenderness lambda = 1 and values of these functions were the same for slenderness lambda and 1\lambda. Influence of Poisson's ratio in range from 0,2 to 0,4 was smaller. Absolute value of areal convergence and its rate decreased with increase of Poisson ratio. Results of research have been shown on figures.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Analiza obrazów sekcji pseudoimpedancji akustycznej
    (Wydawnictwa AGH, 2008) Figiel, Włodzimierz; Kawalec-Latała, Ewa
    Approximate distribution of acoustic pseudo-impedance can be obtained from calculation of inversion of the seismic section. That data of the acoustic resistance distribution are the base to image creation and visual interpretation of surrounding rock morphology. That method is useful for lithology-phacial changes detection in case that the changes have response in acoustic resistance changes. In practice, high-level noise signal in coexistence with useful one, make interpretation difficult, if not even impossible. In the paper are suggested some methods of image analysis and processing to inhance the acoustic impedance image feature visualization. That is the way to increase image interpretation credibility in process of lithology-phacial change detection in salt deposits.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Detekcja anizotropii teksturalnej w piaskowcach fliszowych za pomocą prostych technik komputerowej analizy obrazu
    (Wydawnictwa AGH, 2008) Domonik, Andrzej
    The study presents the results of investigations of joints surface texture obtained during indirect tensile strength tests on oriented samples of cergowskie sandstones. The techniques and method of quantitative analysis of crack roughness using fractal dimension were presented. Computed values of fractal dimension of precise specified, forced failure surfaces, were compared with directions of natural joints measured in terrain.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Uwarunkowania geologiczno-inżynierskie wznowienia budowy Elektrowni Szczytowo-Pompowej »MŁOTY« koło Bystrzycy Kłodzkiej
    (2008) Kowalski, Edward; Rotkegel, Marek; Stałęga, Stanisław
    Underground mining operations of the construction of Pumped-Storage Power Station »Młoty« were launched in 70's of the 20th century. About 2 km of underground excavation was done than, including partially accomplishment of 3 pressure adits, opening adit, main adit and passby adit. Now, after over 30 years of freezing, a construction resuming is considered. Authors of this paper have done the necessary investigations of the technical state of excavation and characterise the geological and mining conditions of freezing or resuming the construction of power station »Młoty«.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Zastosowanie metod analizy obrazu do opisu ukształtowania powierzchni przełamów skalnych
    (Wydawnictwa AGH, 2008) Młynarczuk, Mariusz
    Characterization of rock fracture surface plays an important role in geotectonic description of rock massiffs. It gives information about rock strength, stability, permeability, etc. The parameters usually used in order to characterize the rock fracture surface are based on qualitative description or on basic quantitative analyses. Although these analyses are easy to perform, they generally give a limited amount of information and not always follow by the improvement of measurement techniques. In the paper a new method of the characterization of rock fracture surface based on image analysis and particularly on mathematical morphology was proposed. One assumes that application of these tools to analysis of data coming from profilemeters (i.e. laser profilemeter) may lead to determine new parameters describing the rock surface and in effect to improve the possibility of quantitative description of rock fractures. As the result of the research one can also claim that application of image analysis and mathematical morphology to rock fracture measurements allows distinguishing (grouping) analyzed rock fracture in view of structural and textural properties of these rocks.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Właściwości geomechaniczne opok
    (Wydawnictwa AGH, 2008) Pinińska, Joanna
    The Lublin Region represents unusual example of co-existence of mining, building industry and rock workings,. The roots of today's industries in the Lublin Region reach as far back as Medieval times and even farther back - the Paleolithe. Cherts from chalky limestones in the river Vistula Valley, until the beginning of Iron Age, were basic supply for the various tools and weaponry. Prehistoric artisans, knowing the mechanical properties of chert bearing rocks and knowing how to mechanically processing hard cherts, become precursors of today's geomechanics. Availability of common carbonate rocks of the Upper Cretaceous and Neogene made significant impact on building industry. The defense heavy fortresses, sacral monumental buildings, and magnificent residential and common buildings are typically made of white, chalky and siliceous limestone blocks all over the Lublin Area. In the paper are outlined geological aspects and geomechanical assessment of the special, regional rock building material resources in the Lublin Region - the siliceous limestone, their geomechanical properties, which became the base of traditional building industry. Under special consideration is the vulnerability of siliceous rocks to physical deterioration with the passage of time. The description of typical forms of destruction of stony building elements is completing the paper.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Przestrzenna analiza numeryczna wytężenia filarów komór solnych pola eksploatacyjnego Pagory w otworowej Kopalni Soli »Barycz«
    (Wydawnictwa AGH, 2008) Cieślik, Jerzy; Flisiak, Danuta; Flisiak, Jerzy; Mazurek, Jakub
    This paper presents results of the three dimensional, geometrical and numerical modeling of cavern layout in the Pagory region of Barycz salt mine excavation region. In the first part of the paper authors perform 3D geological and mining situation geometrical model and prepare the whole region cavern representation. The stress and strength distribution maps obtained from numerical analysis allowed evaluation of strength of the salt pillars and regions of high probability of caverns hydraulic connectivity. Finally, a numerical calculations result was compared with mining caverns hydraulic connectivity investigations.
  • thumbnail.journal.alt
    Item type:Article, Access status: Open Access ,
    Wybrane własności węgli w rejonach zagrożonych wyrzutami metanu i skał
    (Wydawnictwa AGH, 2008) Dutka, Barbara; Wierzbicki, Mirosław
    Two sudden outbursts of gas and coal have occurred in the hard coal mine »Zofiówka« in the Upper Silesian Coal Basin (USCB - Poland) last years. Both incidents took place in a district which had been acknowledged hitherto as a not endangered by that kind of hazard. It seems that the outbursts in USCB have a local nature and their incidence is connected with presence of geological disturbances in the rock mass. This paper summarises some results of the following laboratory measurements carried out for coals from the »Zofiówka« hard coal mine: sorptive properties of coal, their porosity and gas capacity. Coals of modified structure were tested and the tests results were compared with results obtained for coals of normal structure. Some obtained results show that coals of modified structure have higher gas capacity and diffusion coefficient than their non-modified counterparts as well as they have high porosity and low conciseness. These properties may cause a significant increase of gas and coal outburst hazard in the areas where coals of modified structure occur. Obtained results allow to understand better the mechanism of coal fracture and can lead to increase of safety of coal exploitation.