Description. Zhangji Coal Mine is located in Huainan of Anhui Province, China, covers area of 71 km 2 with 12 km width from east to west and 9 km length from north to south, which belonging to a large modernization mine. The specific geographical location is shown in Fig. are four shafts including the main shaft, auxiliary shaft, ventilating shaft and the
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үнэ авахtop coal caving support as the engineering object, this paper analyzes the dynamic response of the support after a
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үнэ авахChina, mineable reserves of steeply inclined coal seams account for approximately 17 % of the total coal reserves. Out of these reserves, 62 % are distributed in north China and the rest in south China (Xu 2005).The overall distribution is shown in Table to the statistics, 103 mines, which account for % of the total 626 stateowned
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үнэ авахand several mechanical methods around midcentury. Underground furnaces were inexpensive to 6 William Galloway. "On Coaldust Explosions," pp. 3334, 6566. 7 Clifford, "Furnace," 69. 8 Clark and Jacks, "Coal, 69: "little sign of a technological revolution in coalmining."
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