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    Wyświetlanie 1-4 z 4
    Tytuł:
    Open pit slope stability analysis in soft rock formations at Thar Coalfield Pakistan
    Autorzy:
    Pathan, Shafi Muhammad
    Pathan, Abdul Ghani
    Siddiqui, Fahad Irfan
    Memon, Muhammad Burhan
    Soomro, Mairaj Hyder Alias Aamir
    Powiązania:
    https://bibliotekanauki.pl/articles/2203337.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    szyb górniczy
    skała osadowa
    modelowanie komputerowe
    open pit slope stability
    overall slope angle
    Thar Coalfield
    computer modelling
    Opis:
    Slope Stability Analysis is one of the main aspects of Open-pit mine planning because the calculations regarding the stability of slopes are necessary to assess the stability of the open pit slopes together with the financial feasibility of the mining operations. This study was conducted to analyse the effect of groundwater on the shear strength properties of soft rock formations and determine the optimum overall slope angle for an open pit coal mine at Thar Coalfield, Pakistan. Computer modelling and analysis of the slope models were performed using Slide (v. 5.0) and Phase2 (v. 6.0) software. Integrated use of Limit Equilibrium based Probabilistic (LE-P) analysis and Finite Element Method (FEM) based shear strength reduction analysis was performed to determine the safe overall slope angle against circular failure. Several pit slope models were developed at different overall slope angles and pore-water pressure ratio (Ru) coefficients. Each model was initially analysed under dry conditions and then by incorporating the effect of pore-water pressure coefficients of Ru = 0.1, 0.2, and 0.3 (partially saturated); finally, the strata were considered to be fully saturated. It was concluded that at an overall slope angle of 29 degrees, the overall slope will remain stable under dry and saturated conditions for a critical safety factor of 1.3.
    Źródło:
    Archives of Mining Sciences; 2022, 67, 3; 437--454
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Impact of longwall mining on slope stability – A case study
    Autorzy:
    Nguyen, Phu Minh Vuong
    Powiązania:
    https://bibliotekanauki.pl/articles/2172890.pdf
    Data publikacji:
    2022
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    open pit mining
    OP
    underground mining
    UG
    OP-UG interaction
    slope stability analysis
    numerical modeling
    Opis:
    In recent decades, many open pit (OP) mines have either already made the decision or are at the planning stage to change their mining activity from OP to underground (UG) to remain competitive. Technically, before the OP ends its operation, both OP and UG mining will have to be operated simultaneously for a certain period of time. It is well known that UG operation causes subsidence, discontinuous deformations, and changes in hydrogeological conditions. In case of UG operation located below the OP mine, slope deformation can be expected as a result of subsidence induced by UG exploitation. This paper presents a numerical analysis of slope stability under the influence of the longwall mining operation at the Cao Son OP mine in Vietnam. All calculation variants were performed using the Finite Difference Method code, FLAC. In order to evaluate slope stability of the OP slope, various geometry configurations showing advances of both OP and UG extractions were examined. Based on the outcomes, assessments on OP slope are presented, and then, practical actions regarding the location and direction of UG extraction are recommended, with an aim to minimize the impact of underground mining on OP slope.
    Źródło:
    Studia Geotechnica et Mechanica; 2022, 44, 4; 282--295
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    What were the reasons for the rapid landslide occurrence in “Piaseczno” open pit? – analysis of the landslide process
    Autorzy:
    Jakóbczyk, J.
    Cała, M.
    Stopkowicz, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/178828.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    landslide
    open pit mine
    slope stability analysis
    numerical modelling
    Limit Equilibrium Method
    LEM
    Shear Strength
    Reduction Method
    SSRM
    Opis:
    Landslides are major natural hazards occurring in opencast mining. The problem of slope stability failure in the existing open pit mines as well as in those which are at a stage of technical closure is current issue in Poland and all over the world. This problem requires conducting in-depth and meaningful analysis which will identify the causes of processes characterized by a very rapid course and large extent. The paper presents the analysis of the landslide causes, which took place on May 11, 2011 on the western slope of the internal dump in “Piaseczno” sulphur mine (at a stage of technical closure). It was the first native sulphur open pit mine in Poland in which the exploitation was carried out from 1958 untill 1971. Reclamation works have been ongoing since 2005. The aim of these works is to create water body which will be used for recreational purposes. During the reclamation works on the western slope of “Piaseczno” reservoir the landslide processes were activated. A detailed description of geology and preliminary analyses of landslide processes are given in [1]. The development of landslide took place in a very violent manner. Moreover, the occurrence of the landslide caused the movement of the reservoir shoreline by about 350 meters and created a bay with the area of approximately 6 hectares. Displacement of 600 000 m3 of soil masses under the water resulted in its level rising by 56 cm. The total volume of ground masses was over 1 million m3. The analysis of the landslide process activation was carried out for two representative cross-sections of the internal dump. Numerical calculations were performed using the Limit Equilibrium Method (SLOPE/W GeoStudio) and the Finite Difference Method using the Shear Strength Reduction Method (FLAC Slope). They were aimed at determining the shape and extent of potential slip surface, which would correspond to the observed landslide. The purpose of the analysis, the results of which are presented in the article, was to define how the process proceeded and what factors contributed to its activation.
    Źródło:
    Studia Geotechnica et Mechanica; 2015, 37, 1; 25-35
    0137-6365
    2083-831X
    Pojawia się w:
    Studia Geotechnica et Mechanica
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Slope failure incidents and other stability concerns in surface lignite mines in Greece
    Autorzy:
    Zevgolis, Ioannis E.
    Deliveris, Alexandros V.
    Koukouzas, Nikolaos K.
    Powiązania:
    https://bibliotekanauki.pl/articles/1839006.pdf
    Data publikacji:
    2019
    Wydawca:
    Główny Instytut Górnictwa
    Tematy:
    excavation
    open pit
    slope stability
    geotechnical engineering
    displacements
    coal mine
    wydobycie
    odkrywka
    stateczność zbocza
    inżynieria geotechniczna
    przemieszczenia
    kopalnia węgla
    Opis:
    An important aspect of the Greek surface lignite mines relates to the stability of the corresponding excavations. The more recent ones, over the last few decades, have become larger and deeper (up to 200m) compared to those in the past and, as a result, more difficult to manage. In fact, during the last ten years, several incidents of excessive deformations or catastrophic slope failures have been reported. Therefore, a robust practice of geotechnical engineering is very important. The scope of the present work is to provide a critical review of the relative literature on slope failure incidents and other stability concerns, and also to briefly present cases for which no information has been published in the past. The paper consists of three sections: an inclusive review of early studies, a more extensive review of recent cases of stability problems, and a critical discussion on commonly anticipated failure mechanisms. Based on the above, relevant conclusions are drawn and discussed. Overall, it is concluded that thorough practice of geotechnics is becoming increasingly crucial for the effective and sustainable management of the Greek lignite mines.
    Źródło:
    Journal of Sustainable Mining; 2019, 18, 4; 182-197
    2300-1364
    2300-3960
    Pojawia się w:
    Journal of Sustainable Mining
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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