Browsing by Subject "rock mass"

Now showing 1 - 20 of 23

Access status: Open Access ,
Analiza rozkładu wstrząsów górotworu w rejonie ściany B-l pokładu 403/3 w aspekcie wybranych czynników górniczych i geologicznych
(2007) Małkowski, Piotr; Majcherczyk, Tadeusz; Niedbalski, Zbigniew
The paper presents rockbursts layout in the area of the longwall B-1 which was located close to the faults. Recording dynamic phenomenas let assume, that seismic activity in the region were shown by the exploitation and regional tremors. The analysis of the stress field and the failure zone in the longwall B-1 area proved that one group of tremors were connected with mining factors and the second one with rock mass movements on the fault surface.
Access status: Open Access ,
Badania zasięgu i intensywności strefy spękań wokół chodnikowych wyrobisk korytarzowych
(Wydawnictwa AGH, 2009) Kabiesz, Józef; Patyńska, Renata
In the Carboniferous stratified rock mass there occur discontinuity systems coupled to its lithologic structure and the structural features of rocks. The formation of an opening causes the cracks to part, which frequently leads to the essential degradation of the rock mass strength parameters around the opening. Changes in the rock mass properties around the excavation can be of the highest importance to the selection of its proper support, as well to the assessment of maintenance requirements, hazards occurring in its vicinity, rock mass imperviousness, etc. The problem of the fracture distribution around excavations has been confined to the characteristic of natural fractures. The rock fracture distribution has been investigated and assessed based on the in situ performed studies of endoscopic bore-holes and on the aerometric measurements. From the obtained results of the analysis and the existing rock mass classifications, the fracture characteristics of the surroundings of the excavations under study are presented and, for example, the rock mass imperviousness classification needed for their use in the formation of underground storage facilities to store gases and liquids is given.
Access status: Open Access ,
Changes of some of the mechanical properties of rocks and rock mass in conditions of mining exploitation and mine workings flooding
(2012) Bukowski, Przemysław; Bukowska, Mirosława
Eksploatacja górnicza powoduje wpływy w obrębie górotworu, które przejawiają się jego destrukcją i odwodnieniem. Procesy te oddziałują na właściwości skał górotworu powodując ich zmianę, zmianę stanu zagrożeń naturalnych i warunków prowadzenia robót górniczych. Odwadnianie górotworu prowadzi do wzrostu wartości parametrów wytrzymałościowych skał, które ponownie mogą się zmniejszyć na przykład. pod wpływem nasycania ich wodą w procesie zatapiania wyrobisk górniczych. W artykule przedstawiono współzależności zmian warunków geomechanicznych i hydrogeologicznych zachodzących w górotworze pod wpływem eksploatacji górniczej. Na tle wyników porównawczych badań laboratoryjnych i polowych wykonanych przed i po przejściu frontu eksploatacyjnego, scharakteryzowano zmiany wytrzymałości na ściskanie skał znajdujących się w strefie wpływów podbierania i nadbierania pokładu. W nawiązaniu do zmian sytuacji górniczej w GZW po 1945 roku scharakteryzowano zmiany w warunkach hydrogeologicznych i ich wpływ na warunki geomechaniczne w otoczeniu wyrobisk górniczych. Zasygnalizowano znaczenie zmian warunków hydrogeologicznych i geomechanicznych dla prawidłowego wykonywania ocen warunków bezpiecznego prowadzenia robót górniczych.
Access status: Restricted ,
Geodezyjna Obsługa Drążenia Tuneli
(Data obrony: 2012-01-20) Skobel, Marcin
Wydział Geodezji Górniczej i Inżynierii Środowiska
Access status: Open Access ,
Interpretacja pomiarów i wstępne wyniki badań nad zastosowaniem ukierunkowanego hydroszczelinowania skał do określania naprężeń w górotworze
(Wydawnictwa AGH, 2010) Makówka, Janusz
In the paper, present research state over use of directed hydrofracturing to determine principal stresses in rock mass are presented. Measure procedure, two methods to determine hydrofracturing characteristic pressures and method to calculate values and directions of principal stresses on the basis of the pressures has been presented. Current results of research in form of principal major stress orientation in shaft area in »Wujek« mine are shown.
Access status: Open Access ,
Metoda oceny jakości wklejenia żerdzi kotwiowych w górotworze jako skuteczny sposób kontroli stanu bezpieczeństwa pracy w wyrobiskach korytarzowych
(2007) Staniek, Andrzej
A rock bolt which is grouted underground may not be properly inserted with the result of discontinuity of resin layer. Such discontinuity may also occur in working conditions due to typical rock behavior and displacement. It may be very hazardous to mine safety. In this paper a method for non-destructive identification of discontinuity of a resin layer surrounding rock bolt is presented. The method used modal analysis procedures and is based on an impact excitation where a response transducer is positioned at a visible part of a rock bolt. As an installed rock bolt acts as an oscillator, different length of discontinuity of resin layer changes its modal parameters. By proper extraction of these parameters, from which a resonant frequency is seen as most valuable, the intended identification is possible. Also the results of research work concerning influence of explosions on installed rock bolts are presented. The investigated rock bolts were localized in a coal mine roadway near the region of explosions of dynamite charge. The test were performed before and after the explosions. The usage of the method was tested in copper mines as well.
Access status: Open Access ,
Modelling of PDC drill bit whirling
(2007) Prigorovska, Tania O.
At this work it was made the attempt to explain the process of PDC drill bit whirling as an integral part of drilling in real conditions. It was shown that the causes of PDC whirling are not only the rock mass heterogeneity, but drill bit mass misbalance too and it is impossible to obtain absolutely stable drilling system. PDC drill bit previous models were based on the assumption all cutting forces are stable and that PDC drill bit oscillation is self appearable or stochastic. Based on the theory of probability it was defined the value of cutting forces on every PDC cutter and generalized drill face reaction and it was drill bit oscillation and whirling were analyzed.
Access status: Open Access ,
Modelowanie numeryczne stanu naprężenia w sąsiedztwie przodka wyrobiska ścianowego z uwzględnieniem obecności metanu
(Wydawnictwa AGH, 2011) Florkowska, Lucyna; Walaszczyk, Jan
Knowing the state of stress within rock mass near the exploitation area is a crucial element of planning mining works, especially in areas containing methane, which often happens in case of coal exploitation. One of the solutions to this problem is numerical modeling. This paper presents a method of estimating the changes of the state of stress around long wall exploitation area, based on MES numerical simulation. Mathematical model used here, treating coal as porous compressible medium, considers the presence of methane within rock mass and its flow caused by exploitation. It allows to observe both the changes of the state of stress and of methane porous pressure within rock mass. The results obtained were compared to the results of methane pressure tests available in literature.
Access status: Restricted ,
Obserwowane a modelowe rozkłady poziomych odkształceń w rozetach pomiarowych
(Data obrony: 2013-10-16) Skobel, Marcin
Wydział Geodezji Górniczej i Inżynierii Środowiska
Access status: Open Access ,
Ocena stateczności stropów Jaskini Szachownica I
(Wydawnictwa AGH, 2009) Nierobisz, Andrzej; Kotyrba, Andrzej; Merta, Grzegorz
In the paper, chosen results of investigations were presented of cave Szachownica I roof fracturing realised with the help of introscope camera and georadar. The roof stability assessment was performed on the basis of analytical formulas.
Access status: Open Access ,
Ocena szczelności struktur geologicznych przeznaczonych do składowania odpadów płynnych w górotworze
(2006) Zawisza, Ludwik; Macuda, Jan
The changes of rock mass tightness near deep geological structure where liquid waste has been stored may be caused by changes in the medium itself, owing to the on-going exploitation of underground waste storage. The tightness of the strata onlying the underground waste storage is checked with geophysical, hydrodynamic, hydrochemical-hydrodynamic, geochemical and drilling methods. The Authors characterize liquid waste storability, indicating the scope and type of analyses for determining the possibility of liquid waste storage in specific geological structures.
Access status: Open Access ,
Określenie niszczącej strefy wpływów dla zjawisk sejsmicznych
(Wydawnictwa AGH, 2008) Drzewiecki, Jan
The article describes a method to calculate the range of a destructive influence area for seismic events, that is the area where destruction of working may occur. The basis for calculation of this range was the analysis of selected parameters of documented tremors which had taken place between 1990 and 2006. In the calculations a method of forecasting of seismic energy dependent on the intensity of exploitation with focus of tremors located in the front of coalface. Calculations were made for zones which size assumes probability of 20%, 50% and 80% of working destruction. Also an example of calculations for exploitation of a coal seam 750 meters below ground has been given.
Access status: Open Access ,
Prawdopodobieństwo zniszczenia wyrobiska górniczego w następstwie wstrząsu sejsmicznego
(Wydawnictwa AGH, 2009) Drzewiecki, Jan
The article illustrates a method to calculate probability of destruction of mine working resulting from influence of seismic events. The basis of calculation are seismic energy of dynamic events' located in the front of coalface and range of destruction areas around of mine working. A program has been elaborated in The Central Mining Institute which enables determining range of areas with given probability of mine working destruction. The results from such calculations can be used for correcting mine workings localizations and elaborating adequate preventive treatment techniques for obtained hazard levels. Also an example of calculations for exploitation of a coal seam 750 meters below ground has been given.
Access status: Open Access ,
Składowanie odpadów w górotworze w świetle krajowych regulacji prawnych
(2006) Macuda, Jan; Zawisza, Ludwik
Storing of liquid waste in the rock mass by injecting it to the rock mass through injection wells is both environmentally safe and economically competitive as compared to other utilization methods. However, such activity has to be licensed by a respective minister. The basic legal acts regulating reservoirless waste storage underground, i.e. Geological and Mining Law as well as Environmental Law are discussed in the paper. Economic Activity Law for waste storage in the rock mass is also presented.
Access status: Open Access ,
Spoiwa na bazie cementu ekspansywnego
(2007) Trębaczkiewicz, Piotr; Winch, Mieczysław
Expansive binders are active materials that meet the compatibility requirements of the concrete construction repairs. Thanks to self-tension of these materials, they react on construction before the forces extort collaboration. This feature is extremely important in underground construction when securing exposed rock mass.
Access status: Open Access ,
Surveying support in geophysical methods
(Wydawnictwa AGH, 2014) Matwij, Karolina ; Matwij, Wojciech
Traditional methods to identify the geological structure of the rock mass are based mainly on the analysis of cores from boreholes. Today, more and more often geophysical methods are introduced to support classical methods or completely replace them. One of the major advantages of this type of measurement is non-invasive analysis of the rock mass.
Access status: Open Access ,
Techniczne uwarunkowania składowania odpadów płynnych w górotworze metodą otworową
(2006) Macuda, Jan; Zawisza, Ludwik
Liquid waste storage in the rock mass through injection wells is conditioned by all requirements imposed on safe mining and environmental protection. This issue is especially important when closed or to-be-closed wells are involved. Selection criteria for injection wells are presented along with principles of wells' design, and range of geophysical surveys of post-exploitation wells, which were designated for injecting liquid waste. Potential complications and drilling failures accompanying waste injection to the rock mass are also pointed out.
Access status: Open Access ,
Ugięcie stropu nad eksploatowanym złożem rud miedzi LGOM - wpływ wartości współczynnika eksploatacji na powstanie stref odciążenia miedzy warstwami stropowymi
(2006) Wosz, Ryszard Józef
The article is continuation of the research works concerning the principal and direct roof strata deflection above the deposit mined by means of the chamber - pillar system with roof deflection in the exploitation conditions of the copper deposit LGOM. A model of the roof deflection and the solutions of the equations of the beam's axis deflection have been shown in the earlier papers. In this paper has presented the functions of the deflection, which depends the coefficient of excavation. Has calculated value of coefficient: a = 0.01-0.5. In the next step were describing the deflection curves of each data of coefficient and has analyzed the different of deflection of the roofs. Were looking for the tangential point of position of the beams. On this base was decided when the beams taken contact and where were generation the part of the less of contact. This situation was defined as beginning of the process accumulation of elastic potential energy, which can be relieve while destroying the bump of the basic roof.
Access status: Open Access ,
Wpływ parametrów uskoku na zasięg jego oddziaływania
(Wydawnictwa AGH, 2011) Drzewiecki, Jan
In this article the method of estimation of range and intensity of fault impact is presented. From the practically point of view when the fault throw is comparable with height of longwall support there is a typical underground mining situation. On the other hand when the fault throw is higher than longwall face it will make an unfavorable situation. In each case the immediate vicinity of the fault or fault zones is characterized by anomalous in relation to the natural/gravity pressure condition. The vicinity of fault is a factor for weakening the rock mass. On the other hand the vicinity of the fault is an area of energy and stress concentration. This concentration in the vicinity of the fault combined with the energy accumulated in the range of longwall mining will determine the possibility of dynamic phenomena in hard coal seam as well as in the roof rocks. The proposed method also takes into account three parameters of fault: the faults throw h, the dip angle of the fault plane alpha and depth of hard coal seam H. The range of stress anomaly zones in the two walls of the fault is determined using a computer program developed by GIG called »SIGMA Z« for calculating the stress values using the formulas developed for calculating the values of the anomalous propagation velocity of longitudinal seismic wave in the analyzed area. Currently, this method is used in predicting stress distribution in the area of the mining activities.
Access status: Restricted ,
Wpływ technologii likwidacji szybu KWK Brzeszcze na warunki hydrogeologiczne w górotworze
(Data obrony: 2016-09-28) Woźniak, Kacper
Wydział Geologii, Geofizyki i Ochrony Środowiska
Praca obejmuje zjawiska hydrogeologiczne związane z likwidacją szybu górniczego. Opisane zostały trzy warianty technologiczne likwidacji szybu górniczego w aspekcie konsekwencji hydrogeologicznych górotworu. Każdy z rodzajów zastosowanej technologii niesie ze sobą określony wpływ na środowisko hydrogeologiczne. Dlatego też każdy z wariantów poddany został szczegółowej analizie w celu wybrania wariantu najmniej ingerującego w ustabilizowane od lat środowisko hydrogeologiczne. W wybranym wariancie dodatkowo przedstawiono alternatywne przypadki przepływu wody w górotworze w zależności od zachowania się zasypu filtracyjnego.