![]() The slope of an open-pit mine is crucially influenced by the slope geometry, quality of rock mass and presence of geological features and their properties. Slope instability of open-pit mines has adverse impacts on the overall mine profitability, safety and environment. Consistent with the calculation results of the extension model and in line with the field situation, the extension matter–element model and cloud model built in this paper can verify each other and have a certain scientificity. The coal mine is in grade 2, which is a relatively safe state. The calculated similarity of the overall index evaluation cloud map of the coal mine and each grade is 0, 0.3453, 0.7872 and 0, respectively. The comprehensive correlation degree of each grade of the coal mine is −0.29836, 0.192232, −0.1093 and −0.46531, and the coal mine is concluded to be in grade 2. ![]() Surface slope and subsidence area are also very important. ![]() The results show that the main factors that affect the surface subsidence of southwest mines are the number of coal seam layers, mining height and comprehensive Platt hardness of rock, similar to that of northern plain coal mines. A coal mine in Anshun, Guizhou, is taken as an example to calculate the evaluation level of surface subsidence and thus verify the scientificity of extension theory and cloud theory. A matter–element model of surface subsidence based on matter–element extension theory and a cloud model of surface subsidence based on cloud theory are then constructed. Focusing on the problem of surface subsidence caused by mining in southwest China’s mines, a grade evaluation system for surface subsidence of southwest mines is constructed based on the analytic hierarchy process, and ten evaluation indicators are established from the perspectives of mining disturbance and geological structure. Uz preporuke za planiranje mogućih konstruktivnih izmena, dinamike razvoja unutrašnjeg odlagališta i povećanja efikasnosti sistema odvodnjavanja, svakako se realizuje pouzdaniji rad površinskog kopa i sigurnost na radu.ĭue to their complex geological structure, it is difficult to systematically analyze the surface subsidence of coal mines in southwest China, and the factors that cause surface subsidence are also different from other coal mines. Inovirane varijantne analize stabilnosti kosine sa korišćenjem teorije verovatnoće i kvantitativnim pristupom za procenu rizika, predstavljaju osnovu za optimizovanje ugla nagiba generalne kosine unutrašnjeg odlagališta, što je prikazano u obrađenom primeru. Uvećanje zavodnjenosti unutrašnjeg odlagališta otkrivke površinskog kopa Tamnava-Zapadno Polje, kao posledica globalnih klimatskih promena sa pojavom katastrofalnih obimnih padavina i velike poplave, dovelo je i do značajnih ali i trajnih promena geomehaničkih karakteristika materijala, umanjenja stabilnosti generalne kosine unutrašnjeg odlagališta i znatnog povećanja rudarskog rizika. This paper presents various available techniques and tools to achieve these successive phases and illustrate their implementation and also limitations through case studies of slope design in open pit mines.įormiranje geomehanički stabilnih unutrašnjih odlagališta otkrivke ima izuzetno značajnu ulogu pri projektovanju i planiranju razvoja površinskih kopova uglja sa aspekta preraspodele masa otkrivke, dinamike eksploatacije, ekoloških zahteva, rudarskih rizika i troškova. It is therefore important to implement a well-defined methodology which should be conducted according to the following phases: 1) rock mass characterization derived from the acquisition and analysis of geological and geomechanical data 2) determination of the potential mechanisms of deformation and failure, and their numerical modelling 3) slope design and definition of reinforcement and monitoring methods. ![]() But these structures are above all natural geological and geomechanical features and the geological structures as well as the petrographical nature of the rock material control the deformation and failure mechanisms. Therefore their design and implementation must be conducted with all consideration including technical, economical, environmental and safety issues. Slopes in open pit mines must be considered as geotechnical structures. ![]()
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