Distribution Characteristic and Migration Pathways of Metals in Subsidence Zone in a Coal Mine, China
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In order to ensure mine safety production,according to the problem of existing strong aquifer above 2# main coal seam,theoretical calculation and analysis are applied to determine the height of water flowing fractured zone which are all greater than 30 me after mining 2# coal,direct mining will threaten the safety of coal mine. While the height calculation of water flowing fractured zone shows that 6# coal mining will not cause mine water inrush,there is only partial destruction to upper coal seam near the faults. Numerical experiment intuitively shows that 6# coal mining will not destroy the upper coal seam. Upward mining is feasible.
Inrush current
Longwall mining
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ANSYS was applied to researching the feasibility of upward mining coal seam near over gob left by room and pillar mining based on coal-seam occurrence condition of Cuncaota Colliery in Shendong mining field.Main results were list as follows.(1) 6m coal pillar and its roof kept stable after lower 2-2-upper coal seam was mined by room and pillar mining method;(2) 2-1-middle coal seam might be mined by upward mining method;(3) floor of 2-1-middle coal seam kept stable by longwall mining method;(4) in 2-1-middle coal seam mining,maximum surface subsidence was 613mm,maximum horizontal movement was 13.6mm.The results showed that upward mining coal seam near over gob left by room and pillar mining was safe and feasible.
Longwall mining
Pillar
Surface mining
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Based on the exact understanding of water abundance in the 3~(rd) unconsolidated aquifer and the rule of overlying strata damage in thin seam,the influence of water inrush on working face is estimated,the feasibility of retaining sand-proof pillar mining in the 2~(nd) mining area in Yangchun Colliery is demonstrated and the safety mining is realized successfully.The height of sand-proof pillar of Yangchun Colliery in thin seam is reduced from 30m to 10.42m and 6.38Mt coal under water body is able to be mined now.
Longwall mining
Pillar
Inrush current
Surface mining
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The article firstly delineates the basic mining boundary of main mining 2 coal seam, then optimizes north boundary of 2coal seam and determines the 2 coal seam mining scope. Secondly, it discusses what way to mine the east and west block of 3 coal seam and determines 3 coal seam west block open-pit mining and east block underground mining. Finally, it delineates 5 coal seam mining scope below 3 coal seam mining scope and determines the mine open-pit mining boundary.
Scope (computer science)
Open Pit Mining
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West bengal
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Inrush current
Mine safety
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The main object of coal mining is coal seams,so the correlation of coal seams directly or indirectly affects the production safety and economic benefits of coal mine.The first upper 3 coal seam,the upper 3 coal seam and the under 3 coal seam in Daizhuang coal mine are close,and it is not obvious to distinguish.Through the study on the distribution of trace elements in minable seams in Daizhuang coal mine and mastering its rules,we can have a good judgment of different coal seams and effectively avoid the phenomenon of confusing coal seams in mining because of the geological structure factors.Therefore it is significant to design the reasonable mining scheme and progress.Thus it provides scientific basis and guarantee to high efficiency,safety production of Daizhuang Coal Mine.
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Behavior of underground pressure during full-mechanized caving mining extremely thick coal seam in Tashan Colliery was very strong.Rules of underground pressure behavior were obtained with observation data.By analyzing causes of strong pressure with geological conditions and equipment utilization status,improvement measures were put forward.Good effect was obtained in practice.
Longwall mining
Ground Pressure
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The 14、16 coal seams in downthrow part of 4 th mining area in Zhao po Mine have been finished its stopping. A lot of gob water stored up in the gob area. This is harmful to the mine of underlying 16、17 coal seams. For this reason, the in situ field examination by special monitoring system and the numerical simulation were carried out. Based on the results of these works, as well as the introducing of point safety degree conception, the developing height of permeable crack zone(especially micro fissures) in overlying rock strata produced by combined mining of 16 17 coal seams and the possible crack depth in the floor produced by combined mining of 12、14 coal seams were studied in this paper. Moreover, the safety of 16、17 coal seams mining very close under gob water was analysed. All of these works will provide scientifie bais for the safe production of Chao po and other similer coal mines.
Mine safety
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During the mining process of close-distance seams, the interaction between upper and down layers, the special layout of the roadway and the difficulty in supporting, the very quick succession of successive faces, the low production efficiency and other issues are plaguing the efficient coal mine safety production. The pitch of 9#and 10#thin coal seams of Huozhou Coal Electricity Xinzhi Coal Mine of Shanxi Coking Coal Group is only 1.71m, which is taken as the engineering background of our study of the close distance coal seams.Some relatively mature theory on the close-distance seams is used to calculate and analyze the alternate distance of 9#seam and 10#seam combination mining face. The FLAC3D software is used to simulate the stresses in 10#seam and 9#seam under the combination mining with different alternate distances. The result shows that, during the combination mining of Xinzhi Coal Mine 10#seam and 9#seam, the reasonable alternate distance should not be less than 35 m. The research results show how to improve the coal resource recovery ratio,and ensure the safe and efficient production of coal enterprises.
Longwall mining
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