Abstract
IntroductionThe use of Top Coal Caving for exploiting the thick coal seam with shallow buried depth most likely has a strong negative impact on the stability.Case descriptionAnjialing No. 1 Underground Mine is located in Shuozhou City, Shanxi Province of China. The 4# Coal Seam of this coal mine is the thick coal seam with shallow buried depth, which has the thickness of 12 m and the depth of 180 m in average. This paper focuses on predicting the distribution of ground fissures and water-conducted fissures induced by the exploiting of the 4# Coal Seam.Discussion and evaluationWe first create a 3D computational model, and then use FLAC^{3D} software to simulate the mining of coal seam. We then calculate the displacements and tensile strain of the ground surface and strata, and predict the distribution of the ground fissures and water-conducted fissures. Finally, we further analyze the possibility of the perviousness and air leakage of the coal mine on the basis of the predicted distribution of fissures.ConclusionsThe prediction results indicate that: (1) the water-conducted fissures are strongly developed and go through the Neogene aquifuge in some region; thus, it may lead to potential perviousness of coal mine; (2) part of these water-conducted fissures connect with the ground fissures; and this behavior may cause the risk of air leakage.
Highlights
The use of Top Coal Caving for exploiting the thick coal seam with shallow buried depth most likely has a strong negative impact on the stability.Case description: Anjialing No 1 Underground Mine is located in Shuozhou City, Shanxi Province of China
The prediction results indicate that: (1) the water-conducted fissures are strongly developed and go through the Neogene aquifuge in some region; it may lead to potential perviousness of coal mine; (2) part of these water-conducted fissures connect with the ground fissures; and this behavior may cause the risk of air leakage
In the process of the first 11 steps of mining, i.e., when the working face is extended from the beginning to the length of 110 m, the calculation results indicates that the tensile deformation of the ground surface in the mining area is far less than 5 mm/m
Summary
We first create a 3D computational model, and use FLAC3D software to simulate the mining of coal seam. We calculate the displacements and tensile strain of the ground surface and strata, and predict the distribution of the ground fissures and water-conducted fissures. We further analyze the possibility of the perviousness and air leakage of the coal mine on the basis of the predicted distribution of fissures
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