Abstract
The dumps in the open-pit mining area in the eastern grassland are prone to landslides due to the fragile ecological environment, so it is inevitable to reshape the dump slopes. In order to explore a more scientific method for slope shaping of open-pit mine dump, slope stability analysis were used to compare effect of three types of slope-type (wave-shaped, slope-shaped and step-shaped slope shaping method)in outside dumping site of Baori Hiller open-pit mine. The results show that the slope stability is negatively correlated with the slope angle, and the stability of different shaping slopes is realized as wave-shaped slope (F=2.711)> Slope-shaped slope(F=2.513)>Step-shaped slope(F=1.047), in which the wave type and slope type are all within the safe range, but the step type slope is unstable; in consideration of cost, stability and erosion resistance, it is better to set the slope angle of the dump to 15°.The wave-shaped shaping method of the natural dumping of the excavation field outside the Baori Hiller open-pit mine has the best effect and is worth promoting.
Highlights
The eastern grassland area is an important coal base in China, with simple mining conditions and low mining costs
The sustainable and stable development of mine is directly related to the stability of mining slope and dump slope[1]
Dump slope is a tower-like multi-step slope mainly composed of loose deposits
Summary
The eastern grassland area is an important coal base in China, with simple mining conditions and low mining costs. Due to the fragile ecological environment, open-pit mining severely damages the ecology and causes various environmental problems. The sustainable and stable development of mine is directly related to the stability of mining slope and dump slope[1]. Dump slope is a tower-like multi-step slope mainly composed of loose deposits. In addition to surface erosion and gully erosion, there are new erosion types such as subsidence, collapse and slope debris flow, which are the most unstable and serious soil and water loss places. The slope stability of dump affects the production safety of the openpit mine, and treatment difficulty of outside dump slope is far greater than that of flat panel[2]
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