Research On The Influence Of Opencast Mining And Underground Mining To Slope Stability Based-on GIS

Many specialists in mining field pay close attention to slope stability analysis of open-pit mine, which relate to the safety production of open-pit mine. The stability analysis would become more complicate when the secondary stress field exists, which appears during opencast mining and underground mining. There are two different kinds of methods to analyze slope stability, at present, i.e. qualitative analysis and quantitative analysis. Qualitative analysis including project analogism and graphic solution, and quantitative analysis mainly including limit equilibrium method (LME), limit analysis method(FEM, BEM, DEM etc.) and reliability analysis methods (Monte Carlo simulation method and stochastic finite element method etc.). The excellent special knowledge is necessary to understand the above methods, while this thesis will give the slope stability analysis in easy understanding methods and show the analyses process and its conclusion visually.The thesis builds a 3D geo-model of non-mining area on ArcView GIS with GPS monitoring information from Shanxi Province Pingshuo Coal Industry Corporation, and the model reappear the landscape of non-mining area visually. Based on the model, we arranged given data and derived contour line, slope, aspect and 3D coordinate of any points. For the east slope of Antaibao, we focus on the rules and reasons of its collapse. The analyses shows that the distance to slope more near its stability is more poor when underground mining is under open-pit slope and collapse happen more easily while slope is more steep or slope degree changes more frequently with cracks.The slope stability analysis is given for the north slope of Anjialing open-pit where only several monitoring sites appear displacement and no collapse or landslide happened during the whole monitoring period. The analyses focus on the influence of those factors such as slope, distance to underground mine, water and crack on slope stability. Based on the rate of slide speed, the dangerous rank is specified. The different dangerous ranks for each monitoring site can be checked through GIS situation. Analysis results show that water influences the stability of local sites with cracks seriously. It is shown that the north slope of Anjialing became stable as stress distribution achieves a balance situation , at the same time the dangerous ranks of different monitoring sites vary from high to low. However, as underground mining move to the north slope of anjialing step by step, its stability will became poor at last.