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| Numerical simulation of ground pressure in short-distance coal seams |
| Li Zhun, Liu Jianzhuang, Liu Shudi， Xue Fuxiang |
| 1. School of Mining Engineering, North China University of Technology, Tangshan 063210,China |
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Abstract To study the ground pressure rules of short-distance coal seam in No.2314 Face of Donghuantuo Mine Kailuan Group, methods of theoretical calculation and UDEC numerical simulation were used to study the pressure rules of transport roadway and wind roadway in the south mining area of No.2314 Face. The results showed that the floor break area of No.8 Coal exceeded the spacing between No.8 Coal and No.9 Coal. The maximum crushing depth was 6 ~ 10 m and the peak stress line was wrong 22 ~ 33 m; the ground pressure of transport roadway was higher than the original rock stress after mining, the stress value of the boundary coal column was 26MPa. There were no plastic damage and structural surface damage in No.2314 Face and No.2324 Face after the mining of No.2394 Face. By the numerical simulation of wind roadway, there was stress concentration of the boundary coal column at No.2314 Face after the mining of No.2394. Vertical expansion damage areas extended little after No.2394 Face mining, mainly in the boundary 5 ~ 15 m range extension, and there existed high articulated core areas in local blocks.
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