Influence of Soil Cover Thickness and Slope Geometry on the Stability of Mine Waste Dump
The soil cover thickness and the slope geometry have a great effect on the slope stability of the reclaimed waste dump.The slope stability at southern open-pit mine of State Power Investment Corporation Inner Mongolia Energy Co.,Ltd was taken as the case to study the influence of soil cover thickness,the bench height and the bench angle on the slope stability by numerical simulation and field monitoring.The research shows that the thicker the soil cover on the waste dump,the larger the bench angle and the higher the bench height,the worse the slope stability of the waste dump.The slope stability can be improved by changing the single-bench slope to multi-bench slope while keeping slope geometry unchanged and meeting the requirements of reclamation construction technology.Comprehensively considering factors such as the reclaimed effect of dump slope,the capacity,the safety of the construction operation and reclamation cost,it is recommended to set the bench angle of 24°-28°,the final slope angle of 26° and the soil cover thickness of 0.5 m.The research results have a certain guiding significance for the design and construction of slope in reclaimed waste dumps.
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