Abstract
This study presents different land saving and loss reducing schemes. Comprehensively compare the economic benefits of the schemes. It is shown that the optimal scheme can recover tons of coal resources on the south slope, creating significant economic benefits. Numerical simulation was utilized to analyze the changes of slope stability, deformation, and shear strain increment in the process of land saving and loss reducing. Results found that the slope stability decreases rapidly, and the toe of the slope has to be internally discharged in time to compress the slope. Timely follow-up of in-slope rows can improve slope stability. The position of the slope shear exit changes with the increase of the distance of the inner row, and its stability increases gradually. When the distance of the lower inner row exceeds 120 m, the increase of the internal row distance has little influence on the slope stability. When the inner distance exceeds 60 m in the process of internal dumping of upper platform, the position of potential sliding plane gradually changes from the lower dump to the upper and lower dump with the increase of inner dumping distance. It shows that the stability of the dump will be damaged if the upper dump continues to be discharged. Therefore, the distance between the upper and lower dump sites is more important than 60 m. The stability of the south slope is good in the process of mining and internal drainage, and the overall stability of the south slope is controllable, based on slope radar monitoring.
Highlights
As China’s main source of energy, coal ranks first in the energy structure in terms of both extraction and consumption [1]
The large-scale mining operations caused by the waste of coal resources is more prominent, according to statistics China’s annual loss of coal resources in the billion tons, resulting in a huge waste of resources and economic losses
Large open-pit mines in China are mainly located in remote areas such as Xinjiang and Inner Mongolia, where the ecological environment consists mostly of fragile Gobi or grasslands [3], and the open-pit mining operations [4] have caused large-scale damage to the geological structure and vegetation in these areas [5, 6]
Summary
As China’s main source of energy, coal ranks first in the energy structure in terms of both extraction and consumption [1]. The technology of land saving and loss reducing attaches great importance to the reduction of ecological damage on the surface of the earth, which involves expanding the boundary of the bottom of the mine without changing the surface boundary, compressing the flat plate width of the lower coal steps of the end slope to improve the slope angle, and changing the straight slope to an upward and downward steep slope to improve the recovery rate of the lower coal resources and achieve resource reduction [25] This technology brings some problems: due to the steepening of the end slope, the width of flat plate and overlying rock seam is reduced, which sacrifices the development of the transportation system and greatly increases the distance and freight cost of the inner row of materials and affects the stability of the slope [26, 27]. It provides important technical reference and has significant engineering significance for improving the safety of the project site and realizing the integration of land saving and loss reduction and mining technology
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