Abstract
Underground coal mining will cause large-scale surrounding rock movement, resulting in surface subsidence and irreversible deformation of surface morphology, which would lead to geological disasters and ecological environment problems. In this paper, FLAC3D numerical model is built based on the natural slope gradient, slope type, and included angle between the slope and working face, and their influences on the change of surface morphology and soil erosion caused by underground coal mining is studied. Research results show that the change of slope gradient caused by underground mining decreases with the increase of natural slope gradient, while slope length has opposite laws; different slope types have different changes of slope morphology. The order of slope types corresponding to gradient changes is mixed slope < uniform slope < concave slope < convex slope; the length of the concave and uniform slope decreases, and the convex and mixed slope length increases. When the included angle between the slope and working face is 0° ≤ α < 90°, the underground mining will cause the natural slope gradient increase, the change of the slope gradient will increase with the rise of the angle, the slope length will decrease, and the rate of decrease will be reduced with the increase of the angle. Coal mining will cause the increasing of the runoff and erosion modulus of slope, mainly runoff modulus.
Highlights
As an important nonrenewable energy source, coal is the main energy supplier of domestic industrial production, which has a direct effect on China’s economic development [1,2,3]
Slope type, and the included angle between the slope and working face are taken as variables to design the surface morphology, while the underground strata, mining depth, mining thickness, working face width, and annual advancing distance remain unchanged in the model. e horizontal projection of slope is located at model X (100–300 m)
We have found from the related literatures [18] that the actual slope type is simplified as uniform slope by researchers in the process of study, in which there must be certain errors in the research results, that is, the estimation topographic factors for concave slope is higher than the actual value, and the estimation of topographic factors for both the convex slope and the mixed slope is lower than the actual value
Summary
As an important nonrenewable energy source, coal is the main energy supplier of domestic industrial production, which has a direct effect on China’s economic development [1,2,3]. Erefore, it is of great significance to study the change of surface morphology caused by underground coal mining [11, 12]. On the slope morphology of the mining subsidence area by numerical simulation from the perspective of underground mining conditions and probed into effects of the aforementioned factors on soil erosion from a new perspective of combining underground with surface. Erefore, from the perspective of original surface morphology and its relative position with the working face, MIDAS-FLAC3D numerical simulation software is selected to study the influence of natural slope gradient, slope type, and the angle between the slope and working face on the change of slope morphology, including slope gradient and slope length, caused by underground coal mining in order to provide reference and basis for reducing the influence of underground coal mining on the slope Mathematical Problems in Engineering conditions, and by the original surface morphology and its relative position with the working face. erefore, from the perspective of original surface morphology and its relative position with the working face, MIDAS-FLAC3D numerical simulation software is selected to study the influence of natural slope gradient, slope type, and the angle between the slope and working face on the change of slope morphology, including slope gradient and slope length, caused by underground coal mining in order to provide reference and basis for reducing the influence of underground coal mining on the slope
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