浅埋特大采高综采面沿空侧强矿压显现机理研究
发布时间：2018-08-27 11:16
【摘要】：神东矿区大柳塔煤矿7m特大采高52303工作面回采过程中,沿空侧机尾区域以及回风顺槽出现了强烈的矿压显现,给安全高效生产带来了严重的影响。论文综合运用现场实测、理论分析以及数值模拟等手段,对沿空侧区域强矿压显现机理、影响因素及其防治对策展开了深入研究。对比分析了三个不同开采区域各类矿压显现强度指标,发现:机尾130#~151#支架范围内的工作面矿压显现规律与回风顺槽矿压显现规律,在不同开采区域有着显著的差异性。运用岩体的极限平衡理论,得出:埋深达250m时,两侧采空的20m宽区段煤柱发生塑性失稳,这将引起施加其上的集中应力向前方转移而施加到一侧采空煤柱区域及工作面超前实体煤上,加剧了煤体塑性区宽度扩展,进而导致了52303工作面机尾区域及回风顺槽的强矿压显现。同时,UDEC数值模拟结果及现场实测进一步验证了两侧采空区段煤柱失稳是引发此类强矿压显现的关键环节。通过FLAC3D数值模拟,掌握了煤层埋深、工作面采高、区段煤柱宽度3个因素对强矿压显现的影响规律。结果表明:当埋深大于250m或采高大于7m时,区段煤柱临近塑性失稳状态,势必引起工作面沿空侧的强矿压显现;而当煤柱宽度为大于25m时,区段煤柱能保证其自身稳定性,则不会对工作面沿空侧矿压造成影响。基于弧形三角块回转运动和煤柱宽度的影响,提出了增加区段煤柱的留设宽度、超前工作面对区段煤柱实施注浆加固煤柱、爆破强放工作面顶板减轻煤柱上覆载荷等防治对策,指导了邻近52302工作面的安全回采。
[Abstract]:During the mining process of the 7m mining height 52303 working face of Daliuta Coal Mine in Shendong Mining area, strong mine pressure appeared along the goaf tail area and the return air trench, which brought serious influence to the safe and efficient production. By means of field measurement, theoretical analysis and numerical simulation, the mechanism, influencing factors and control measures of strong rock pressure along the goaf are studied in this paper. By comparing and analyzing the intensity indexes of various kinds of rock pressure in three different mining areas, it is found that the law of mine pressure behavior in working face within the range of 130#n151# support and the law of mine pressure appearing in return air in the same trench have significant differences in different mining areas. Based on the limit equilibrium theory of rock mass, it is concluded that when the buried depth is 250 m, the plastic instability of coal pillar in 20m wide section of both sides of mining occurs. This will cause the concentration stress on the coal to be transferred forward and applied to the coal pillar area of one side and the coal face leading to the solid coal, which will aggravate the width expansion of the plastic zone of the coal body. This result in the strong mine pressure in the tail area of 52303 face and the return air trench. At the same time, the numerical simulation results of UDEC and the field measurements further verify that the instability of coal pillar in both goaf sections is the key link to trigger this kind of strong rock pressure behavior. Through FLAC3D numerical simulation, the influence of three factors, including coal seam depth, face mining height and section pillar width, on the behavior of strong rock pressure is grasped. The results show that when the buried depth is more than 250 m or the mining height is more than 7 m, the section pillar is near the plastic instability state, which will inevitably cause the strong rock pressure along the face, and when the coal pillar width is more than 25 m, the section pillar can guarantee its own stability. It will not affect the mine pressure along the gob side of the face. Based on the influence of rotary movement of arc triangle block and the width of coal pillar, this paper puts forward some preventive countermeasures such as increasing the retaining width of coal pillar in the section, strengthening the pillar with grouting in front of the pillar in advance, and reducing the overburden on the coal pillar by blasting the roof of strong caving working face. It guides the safe mining of the adjacent 52302 working face.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323
本文编号：2207112
[Abstract]:During the mining process of the 7m mining height 52303 working face of Daliuta Coal Mine in Shendong Mining area, strong mine pressure appeared along the goaf tail area and the return air trench, which brought serious influence to the safe and efficient production. By means of field measurement, theoretical analysis and numerical simulation, the mechanism, influencing factors and control measures of strong rock pressure along the goaf are studied in this paper. By comparing and analyzing the intensity indexes of various kinds of rock pressure in three different mining areas, it is found that the law of mine pressure behavior in working face within the range of 130#n151# support and the law of mine pressure appearing in return air in the same trench have significant differences in different mining areas. Based on the limit equilibrium theory of rock mass, it is concluded that when the buried depth is 250 m, the plastic instability of coal pillar in 20m wide section of both sides of mining occurs. This will cause the concentration stress on the coal to be transferred forward and applied to the coal pillar area of one side and the coal face leading to the solid coal, which will aggravate the width expansion of the plastic zone of the coal body. This result in the strong mine pressure in the tail area of 52303 face and the return air trench. At the same time, the numerical simulation results of UDEC and the field measurements further verify that the instability of coal pillar in both goaf sections is the key link to trigger this kind of strong rock pressure behavior. Through FLAC3D numerical simulation, the influence of three factors, including coal seam depth, face mining height and section pillar width, on the behavior of strong rock pressure is grasped. The results show that when the buried depth is more than 250 m or the mining height is more than 7 m, the section pillar is near the plastic instability state, which will inevitably cause the strong rock pressure along the face, and when the coal pillar width is more than 25 m, the section pillar can guarantee its own stability. It will not affect the mine pressure along the gob side of the face. Based on the influence of rotary movement of arc triangle block and the width of coal pillar, this paper puts forward some preventive countermeasures such as increasing the retaining width of coal pillar in the section, strengthening the pillar with grouting in front of the pillar in advance, and reducing the overburden on the coal pillar by blasting the roof of strong caving working face. It guides the safe mining of the adjacent 52302 working face.
【学位授予单位】：中国矿业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD323
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本文编号：2207112
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