The Study On Stability Of Dragline Stripping Slope

To increase the coal output, Heidaigou opencast coal mine is carrying on the technique improvement, and the dragline overcast mining system will be adopt . While the new system work, the height of overburden mining bench and discharge bench will over 70m. Then, the stability of stripping slope will be an important problem should be considered in the technical improvement. In the thesis, the finite difference method and the strength reduction method are used to discuss the stability of all kinds of slope in the Heidaigou opencast coal mine. The main content as follows:In chapter 1, the main methods of slope stability analysis in current is introduced. Meanwhile, the merits and demerits of those methods is discussed is the chapter. And the information of coal geology and engineering geology of Heidaigou opencast coal mine is described; moreover, the dragline overcast mining system is introduced.In chapter 2, the operating principle of FDM and basic characteristics of FLAC are briefly reviewed. Moreover, the application of strength reduction method in the analysis of slope stability is described, and an example is given in this chapter to verify its reliability.In chapter 3, the stability of loess slope of open pit coal mines is analyzed. Through mass calculation of slope models, the author illustrates respectively the relation between slope height and safety factor under the fixed slope angle case, and the relation between slope height and slope angle under the fixed slope safety factor case. Moreover, the influence of seepage to stability of loess slope is discussed in the chapter. Furthermore, the safety factor of different height of overburden mining bench and discharge bench is calculated by using of strength reduction method in the FLAC.In chapter 4, the dynamic stability of discharge bench is discussed. Finally, the author gets its related conclusion by model calculating.